Product Support


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What are the main features of the DM-4?

The DM-4 is a high-quality, high-capacity digital recorder loaded with handy and intuitive features as well as support software that can run on both Windows and Mac computers.

It can record in three audio formats: Linear PCM (Linear Pulse Code Modulation), MP3 and WMA (Windows Media Audio). In Linear PCM mode, the files that are created, which have a .WAV extension, can be split in the recorder.

This recorder has 8 GB of built-in flash memory and a card slot that holds one microSD or microSDHC card of up to 16 GB capacity (sold separately). Files can be transferred from the card to internal memory and vice-versa.

The DM-4 features recording and playback “scenes” – configuration templates – that make it easy to enable an array of preferred settings via a single menu selection. Three of the recording scenes are pre-set with optimal settings for specific recording conditions; another three can be customized by the user. Five user-customized playback scenes are available.

There are five folders for organizing recordings and four folders for storing content transferred from a computer. These include separate folders for music, podcasts, audiobooks and pictures. The Music folder holds WMA and MP3 music files transferred from Windows MediaÒ Player or iTunesÒ. The Audiobooks folder contains subfolders for audio content that can be spoken aloud by the recorder, such as content purchased from audiobook dealers,, DAISY content or plain text files with a .txt extension. The Pictures folder stores JPEG thumbnail images that can be displayed in color on the recorder’s LCD.

In the Music mode, the recorder supports playlists, so you can control the order in which your saved songs are played back.

The ZOOM microphone function incorporates DiMAGIC® Corporation’s DVM (DiMAGIC Virtual Microphone) technology for directional recording, and DiMAGIC’s Euphony psychoacoustic technology for enhanced playback through the earphone jack.

The DM-4 also includes accessibility features designed to help the visually impaired. The Voice Guide speaks aloud menu items as they are selected in any of 19 languages.¹ The recorder also speaks the date and time of recorded voice files. The recorder’s buttons feature ridges and grooves to make them more identifiable by touch. In addition, some of the recorder’s options respond to voice commands when the [Voice] button is pressed.

After transferring your recordings to a computer via the bundled USB 2.0 cable, the included OLYMPUS Sonority software can be used to manage, archive and edit PCM and WMA files created by this recorder. (The ability to edit MP3 files is available at additional cost via the OLYMPUS Sonority Plus upgrade.) The software, which is supported on Windows and Macintosh platforms, also enables subscription to and downloads from podcast URLs. The podcasts can be transferred to the recorder’s Podcast folder for playback at the user’s convenience.

The bundled LI-50B battery can be charged in the unit while it is plugged into a computer’s USB port, so you can keep it conveniently topped off while you work with your files.

¹The default languages are English, French and Spanish; however, additional languages may be uploaded to the recorder from a computer via the OLYMPUS Sonority software.

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What are Recording Scenes?

Recording scenes are templates of recorder settings that can be enabled all at once by making a single menu selection. This function is located in the Rec Menu as Rec Scene.

This recorder has six recording scene options. Three are preset out of the box; each is optimized for recording in specific conditions. The other three are reserved for user settings, allowing for customization to suit personal preferences. To enable a customized scene, select one of the available User Settings options and then press the [OK] button. The recorder’s current configuration will be saved as a scene.

The table below shows the menu settings that are applied in each of the preset Recording Scenes as well as the default settings when Rec Scene is set to Off. Only the listed functions are affected when a recording scene with user-customized settings is saved.

The table below shows the menu settings that are applied in each of the preset Recording Scenes as well as the default settings when Rec Scene is set to Off. Only the listed functions are affected when a recording scene with user-customized settings is saved.

Record Setting Off Dictation Conference Lecture
Mic Sense Middle Low Middle High
Rec Level Auto Auto Auto Auto
Zoom Mic Off Off Wide Zoom
Low Cut Filter Off On On On
VCVA Off Off Off Off
Standby On On On On

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What are Playback Scenes?

This recorder has a Play Scene function that enables the user to create up to five Playback Scenes to configure the recorder for preset playback scenarios. The settings that can be saved in a Playback Scene are Noise Cancel, EUPHONY, Voice Filter, Repeat, Random, Play Speed, Forward Skip and Reverse Skip.

To create a Playback Scene, first configure the recorder with the desired settings. Then, in the Play Menu, go to Play Scene and press the [OK] button, select one of the user settings options, and then press [OK] to save the scene. The recorder will save the settings of the functions listed above as a Playback Scene. To create another scene, create a new mix of menu settings and repeat the process, choosing a different user setting option.

To activate a saved Playback Scene, in the menu go to Play Scene, press [OK], select Scene Select, press [OK], choose the desired user setting, and then press [OK] again.

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What is the purpose of the Noise Cancel function?

Noise Cancel can be enabled to reduce background noise in recordings made in noisy surroundings. In effect, the function treats the loudest sounds as the most important and reduces other sounds to make the primary audio signal clearer.

The Noise Cancel options are OFF, LOW and HIGH. The options are set in the recorder’s menu. The LOW or HIGH settings remain valid until Noise Cancel is set to Off. Noise Cancel is not available while the Voice Filter is set, and it cannot be used during Slow Playback or Fast Playback.

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What is EUPHONY?

This recorder features EUPHONY MOBILE – a psychoacoustic surround sound system that combines bandwidth correction, expansion technology and virtual acoustical source-processing technology to allow the listener to alter the audio dynamics when playing back recordings through earphones. EUPHONY creates a natural, expansive feel so listeners are less prone to experience a closed-in feeling or to grow tired over extended listening sessions, such as when playing audio books. The options are: OFF, Natural, Wide and Power.

EUPHONY is only applied during playback and cannot be applied while recording.

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What is VCVA?

Variable Control Voice Actuator (VCVA) is a function that configures the recorder to record automatically when sound is detected at a preset level, and to stop when the sound drops below the threshold level. The purpose of the function is to eliminate “dead air” during recordings, thereby conserving memory and shortening file times.

VCVA is enabled in the recorder’s menu. In this model, the VCVA can be set to any of 23 different values. The higher the value, the more sensitive the recorder is to sounds. At the highest level, even the faintest sound will activate recording.

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What is the function of the Low Cut Filter?

The recorder has a Low Cut Filter function to minimize low-frequency sounds and record voices more clearly. This function can reduce noise from air conditioners, projectors and other types of “white noise.”

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What is the function of the Voice Filter?

The Voice Filter cuts low- and high-frequency tones to create a playback frequency range encompassing the tones in the human voice, thereby making the playback of dictation recordings clearer. Voice Filter works in all playback speeds.

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What enhancements do the upgrades to OLYMPUS Sonority offer?

Purchasing and applying the upgrades will add the following features to the version of OLYMPUS Sonority that is bundled with this recorder:

Plus Edition
  • MP3 Editing – Adds the ability to convert audio files in the WMA, WAV, DSS and DS2 formats into MP3 format. The upgrade can create MP3 files with bit rates of 320 kbps, 256 kbps, 192 kbps and 128 kbps. It can also be used to edit track information, such as Title and Artist, stored in ID3 tags.
  • Create an Audio CD – Simplifies creation of audio CDs by permitting file lists to be built and burned from within Sonority’s Browse window. (A computer with burning capabilities is required.) If the total size of the selected audio files exceeds the capacity of a CD, the files can be divided among multiple CDs.
  • Configuring the Recorder Menu – Built-in advanced device settings (such as the recording mode, alarm setting and timer recording) can be configured using OLYMPUS Sonority Plus.

Music Editing Plug-in
  • Special audio effects – Add any of more than 20 types of advanced effect functions. To view a list of the available effects, click here.
  • Spectrum analyzer – Displays in real time the frequency distribution of a sound being played in the Waveform Editing window.
  • Unlimited track editing – Eliminates the limitation on the number of tracks that can be edited simultaneously.

Purchase of the OLYMPUS Sonority Plus upgrade is a prerequisite for installation of the Music Editing Plug-in.

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What are Index Marks?

Index Marks are digital tags that can be inserted while recording or during playback. They are used to skip forward or backward in recordings to pre-selected points. Up to 16 index marks can be added to a single file.

By default, index marks are inserted using the [F2] button on the recorder You can reassign the insertion of index marks to another Function button using the Fn. Setting function in the System Menu.

Index marks cannot be placed into locked files or into recordings created on machines other than Olympus digital audio recorders. This means that they cannot be placed in podcasts or in audio books. They cannot be placed in files in the Audible folder.

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What are keywords?

Voice files can be tagged with a keyword for file management to make it easier to search for files. The recorder creates subfolders based on keywords so that a group of files can be saved under the same topic, facilitating faster file searching.

To assign a keyword before recording files, open the Recorder menu and press the [F1] button to get the list of keywords. Select a keyword and then press the [OK] button to set it.

To assign a keyword to a previously recorded file, select the file, press the [F3] button and open the File Menu. Select Keyword, select a keyword from the list and then press [OK] to register it.

To search for keyword files, when you open the Recorder menu, select the keyword and press [OK].

The available keywords are: Language lesson, Lesson, HobbyConversation, Telephone recording, Record, Memo, Music, Class, Conference, Business trip, Interview, Work, Plane, Train, Car, Lecture and Event.

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What is the Audio Diary?

The Audio Diary is an audio datebook which can save spoken notes in a calendar using monthly, weekly or daily displays. Topic Keywords can be assigned to recordings so a subfolder for a specific topic – such as Birthday – can be used to speed up file searches.

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What is the purpose of the Audible folder?

The Audible folder (a subfolder of the Audiobooks folder) is used to store and play audio content purchased from the® Web site ( is a source for audio books and audio newspaper and magazine articles. also has Web sites for the United Kingdom, France and Germany for content in other languages.

Audible files are managed not by the bundled OLYMPUS Sonority software but by the Audible Manager software users receive after purchasing a subscription to Audible Manager is used to download audio content from the Web site and transfer it to the recorder’s Audible folder.

When the Audible folder on the recorder is selected, the recorder automatically switches to the Audible mode. The Audible mode is able to play the downloaded Audible files in any of the four formats used by Audible. When a content file is transferred to the recorder, a .pos file is created to record the playback position of a file. This allows the recording to take up where it had left off during a prior listening session.

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What is DAISY?

DAISY (Digital Accessible Information System) was originally intended as a replacement for audio tapes for visually impaired people. The books and information are now used by people with various reading disabilities. DAISY is a worldwide accessible information system developed and maintained by the DAISY Consortium, an international collaborative development organization.

This recorder can play DAISY 2.0 and 2.02 content; however, it cannot play DAISY files that are protected by Microsoft Corporation's DRM (Digital Rights Management) system.

DAISY content can be uploaded to the recorder by first saving it into the DAISY folder in the OLYMPUS Sonority software that comes with the DM-4. From there, it can be transferred to the recorder using the bundled USB cable. After the transfer, the files will reside in the recorder’s Audiobooks > DAISY folder in the menu.

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What is Text Speech?

The Text Speech function reads aloud the contents of a text file (.txt format) that has been transferred from a computer to the recorder's TEXT folder. The recorder uses a simulated voice to read the words while the corresponding text is displayed on the LCD screen.

When the recorder is connected to a computer and opened as a drive, .txt files can be transferred into the TEXT folder using standard drag and drop or copy-and-paste techniques. After disconnecting the recorder from the computer, the files can be played in the recorder. The files will be stored in the Text Speech subfolder within the Audiobooks folder.

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Can the DM-4 download and display still pictures?

The DM-4 comes with a USB Digital Camera Download Adapter so that a digital camera can be connected directly to the recorder using the camera’s USB cable. When the camera and recorder are connected, the transfer of images from the camera’s DCIM folder is run using the menu in the recorder’s Pictures feature. The pictures are transferred in their full file size. Only JPEG images can be played in the recorder on the LCD screen.

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What file formats does this recorder support?

Because this recorder acts as a Mass Storage Class device when it is connected to a computer via its bundled USB cable, files of any type may be transferred to the recorder for storage. However, files in unsupported formats cannot be played by this recorder, and they may not be displayed on the LCD monitor.

The following table illustrates which types of audio files the DM-4 supports in each mode:

¹This recorder does not support the Digital Rights Management (DRM) system of Microsoft Corporation. Music, podcast and audiobook files protected by DRM cannot be played even if they were recorded using a supported sampling frequency and bit rate.

²Music files must be stored in the recorder’s Music folder.

³Podcast files must be stored in the recorder’s Podcast folder.

4Audiobooks in the MP3 and WMA formats must be stored in the Audio Book folder, a subfolder of the Audiobooks folder. Audio content, including audiobooks, purchased from must be stored in the Audible folder, also a subfolder of the Audiobooks folder. content is available in several formats, all of which use the extension *.aa. This recorder can play *.aa files in Audible's mode 4 format. Other modes are not supported.

5This recorder can play WAV files that were recorded in the Linear PCM format.

6Variable bit rate MP3 files (in which conversion bit rates can vary) may not play properly.

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What operating systems support this recorder?

The DM-4 is supported on the following Windows platforms:

  • Windows XP Home Edition service packs 2 and 3
  • Windows XP Professional service packs 2 and 3
  • Windows XP Professional X64 Edition service pack 2
  • Windows Vista (32-bit / 64-bit)
  • Windows 7 (32-bit / 64-bit)

The DM-4 is supported by Macintosh OS X 10.4.11 ("Tiger") - 10.6 ("Snow Leopard").

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Can this recorder play music files that I transfer from iTunes?

This recorder can play music files that are transferred from iTunes to the recorder’s Music folder if the files are in one of the supported audio file formats and are not protected by digital rights management (DRM) technology.

Music files that use the AAC encoding scheme, such as those purchased from music-distribution services like the iTunes Store, cannot be played by this recorder. Music files of this type may have any of the following file extensions: .aac, .m4a or .m4p.

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Can this recorder play podcasts that I transfer from iTunes?

This recorder can play podcast files that are transferred to the recorder’s Podcast folder if the files are in one of the supported audio file formats and are not protected by digital rights management (DRM) technology.

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Can I play my recordings in iTunes and on my iPod?

Files created using any of the PCM (WAV) or MP3 recording modes are supported by iTunes and iPods.

Windows versions of iTunes can convert WMA files into a compatible audio format during the import process. Once converted, the files can be added to the iTunes Library and played by iTunes.

On Macintosh computers, iTunes requires a free, third-party program in order to play WMA files. This program, Flip4Mac WMV Player (also known as Windows Media Components for QuickTime by Flip4Mac), is recommended by Microsoft. After the program is installed, WMA files can be added to the iTunes Library and played by iTunes.

Adding recordings to an iPod is a two-step process. First, the files must be converted to an iPod-compatible format. Next, the files must be synched with the iPod. Please refer to the iPod documentation for full details of these operations.

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How much recording time is available in the DM-4?

The amount of potential recording time available in the DM-4 depends on several factors, including the selected recording mode and whether the recorder is configured to use internal memory or a removable memory card (sold separately).

When a recording mode is selected, several audio file properties are put into place. These properties determine the level of detail of the saved file data. A higher-quality recording saves more-detailed information and creates a larger data file that uses more memory. A lower-quality recording makes a less-detailed data file, so the memory lasts longer. Podcasts and audiobooks, including Audible files, use up portions of the recorder’s built-in flash memory, as do files saved on the recorder when it is used as a USB flash drive (aka “thumb drive”). This usage will reduce the amount of memory available for recording new files.

The DM-4 has 8 GB of built-in memory and can accept microSD or microSD media in capacities ranging from 512 MB to 16 GB. (Click here for a list of compatible cards.) Using removable memory media for storage makes it easier to share recordings and may expand the recording capacity of the DM-4.

The table below shows the approximate maximum recording times possible using the internal memory and a variety of memory cards. The values assume there are no other files saved in the recorder.

Recording Mode

Maximum Recording Time

Internal memory

microSD™/microSDHC™ removable media

8 GB

1 GB

2 GB

4 GB

PCM 48 kHz

11 hrs., 05 min.

1 hr. 15 min.

2 hrs. 45 min.

5 hrs. 30 min.

PCM 44.1 kHz

12 hrs., 05 min.

1 hr. 20 min.

3 hrs. 00 min.

6 hrs. 00 min.

MP3 320 kbps

53 hrs., 00 min.

6 hrs. 30 min.

13 hrs. 30 min.

27 hrs. 00 min.

MP3 256 kbps

66 hrs., 30 min.

8 hrs. 00 min.

17 hrs. 00 min.

34 hrs. 00 min.

MP3 192 kbps

89 hrs., 00 min.

11 hrs. 00 min.

23 hrs. 00 min.

45 hrs. 00 min.

MP3 128 kbps

133 hrs., 00 min.

16 hrs. 30 min.

34 hrs. 00 min.

68 hrs. 00 min.


130 hrs., 00 min.

16 hrs. 00 min.

33 hrs. 00 min.

66 hrs. 00 min.


261 hrs., 00 min.

32 hrs. 00 min.

67 hrs. 00 min.

133 hrs. 00 min.


522 hrs., 00 min.

65 hrs. 00 min.

135 hrs. 00 min.

266 hrs. 00 min.


275 hrs., 00 min.

65 hrs. 00 min.

135 hrs. 00 min.

266 hrs. 00 min.


1,029 hrs., 00 min.

128 hrs. 00 min.

267 hrs. 00 min.

524 hrs. 00 min.


2,043 hrs., 00 min.

255 hrs. 00 min.

531 hrs. 00 min.

1,042 hrs. 00 min.

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What are the maximum recording times per file?

A maximum recording time per file is set for each recording mode. Even if the memory capacity is not exhausted, a single recording cannot be continued beyond the limit.

Maximum Recording Time Per File

Recording Mode

Recording Time

PCM 48 kHz

3 hours, 00 minutes

PCM 44.1 kHz

3 hours, 20 minutes

MP3 320 kbps

29 hours, 40 minutes

MP3 256 kbps

37 hours, 10 minutes

MP3 192 kbps

49 hours, 40 minutes

MP3 128 kbps

74 hours, 30 minutes


72 hours, 50 minutes


145 hours, 40 minutes


291 hours, 30 minutes


291 hours, 30 minutes


574 hours, 00 minutes


1,139 hours, 20 minutes

The maximum capacity for a single WMA or MP3 file is approximately 4 GB.

The size limit for a single file in the Linear PCM format is approximately 2 GB.

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How is the recorder turned off?

The recorder is turned off by sliding the [POWER / HOLD] button on the right side of the recorder downward and then releasing it. The switch should then be moved upward to the HOLD position to prevent accidental activation of button functions.

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How do I select which type of memory to use?

The choice to record to built-in memory or to a memory card is made at Home > Preferences > System Menu > Memory Select. The available options are Built-in Memory and microSD Card. MicroSD and microSDHC cards from 512 MB to 16 GB can be used.

For optimum performance, it is advised to format a card the first time it is put in the recorder. If the card is being used for dictation and files are frequently erased, it is advisable to routinely download all of the files to a computer and format the card to keep it free of a buildup of artifacts of previous files. Occasional formatting of the built-in memory using the menu Format function is also advised. The formatting function is found at Home > Preferences > System Menu > Format.

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Which recording mode should I use?

Different recording modes save the digital record of a signal with different levels of faithfulness to the original sound. The ST XQ and ST HQ modes are recommended for music, drama or interviews that may be made for broadcast because they make very detailed digital records of the sound and use a very wide frequency range.

Lower-quality modes, such as SP (Standard Play) and LP (Long Play), make a less-detailed digital record of the signal and use a narrower frequency range so they will use up the available Flash memory much more slowly. These modes are best used for audio note taking or recording college lectures or seminars – situations in which large content capacity is more important than high audio quality.

Because of their strong compression, MP3 files are more convenient for sending on the Internet and saving in a music library on a portable music player.

Linear PCM-formatted files can be saved on an audio CD that can be played in a car or CD player because it uses the Red Book audio format, which is the same one used in commercial music CDs. Linear PCM does not compress the files, so the files will be quite large and may not be able to be sent as e-mail attachments.

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How is the recording volume controlled?

Recording volume in this model is governed by a two-step process. First, the microphone captures sounds that it can detect, and then the captured audio signals are adjusted – either amplified (made louder) or dampened (made softer) – in order so that the recording maintains a preset volume level. By default, the threshold of the preset volume level is managed automatically by the recorder; however, the recording level can be manually adjusted during recording if the user prefers this option.

The degree to which a microphone is capable of capturing sounds of various loudness is known as microphone sensitivity. The more sensitive a microphone is, the greater the range of sound levels it can capture. In this recorder, the function that controls microphone sensitivity is called MIC SENSE, and it is located in the Rec Menu.

This recorder has three microphone sensitivity levels:

  • High is a high-sensitivity level that can record loud noises at a distance. At this setting, the recorder will also pick up surrounding noises, which may or may not interfere with the intended audio source. It is useful in conference or lecture situations when a speaker is addressing a generally silent audience from a position that is not near the recorder.
  • Middle is suitable for recording small-group meetings and seminars.
  • Low is a low-sensitivity level used for up-close recording. Only sounds that are loud or that are very near the recorder will be detected and recorded. Because background noises are, by and large, uncaptured, they do not interfere with the intended audio signal. This makes Low an ideal setting for audio notetaking and dictation.

After the audio input has been captured by the microphone, the sound is either amplified or quieted until it reaches a preset volume level. This level may be set automatically by the recorder, or it may be set manually during recording by the user. The function that determines the method by which the recording level is adjusted is called Rec Level, and it is located in the Rec Menu.

When Rec Level is set to Manual, the user may adjust the recording volume of the signal during live recording by pressing the left or right arrow buttons on the keypad. Each press of the left arrow reduces the recording volume by one level; each press of the right arrow increases the recording volume by one level. The recording volume can be fixed to a level between 1 (quietest) and 16 (loudest).

When Rec Level is set to Manual, the limiter in the PCM recording mode is disabled. The limiter automatically adjusts the recording level to prevent “clipping.” Clipping occurs when the recording level allows sound levels beyond the dynamic range of a recording device to be recorded. The result is distortion in the louder portions of the recording.

While Rec Level is set to Manual, the DM-4 displays a recording level meter on the LCD screen so that recording levels can be monitored. If the level is too high and clipping may occur, OVER is displayed above the level meter. If this occurs, reduce the recording level until OVER is no longer displayed. It is recommended to do a test recording before doing a final recording when setting the recording levels manually.

Note: During Timer Recording, the Rec Level value is ignored in favor of the recording level specified when the Timer Recording event was established.

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How is playback volume controlled?

The playback volume is controlled during playback by using the [+] (plus) and [-] (minus) buttons on the circular pad on the face of the recorder. Pressing [+] increases the playback volume. Pressing [-] reduces the playback volume.

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How is the playback speed controlled?

The playback speed can be slowed down to 50% or increased to up to 600% of the default playback speed. The tone of the file will be adjusted digitally without changing the pitch so that the recording sounds natural.

From 50% to 200% the speeds is changed in steps of 10. From 200% to 400% the speed is increased in steps of 20. From 400% to 600% the speed is increased in steps of 50. Normal operation may not be available at higher speeds, depending on the sampling frequency and bit rate of the file to be played back. In such a case, select a slower playback speed.

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Can I rename my files when they are displayed on my computer?

Files in the DM-4 should not be renamed when displayed in a computer’s file-browsing software (e.g. My Computer, Finder) because the recorder’s file-management software may not be able to locate a renamed file.

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What does the Zoom Mic function do?

The Zoom Mic function employs the DiMAGIC Virtual Microphone® (DVM) audio pickup system to allow more dynamic recording by focusing on sound from selectable directions. It enables expansive stereo recording to high directivity recording using the DM-4’s built-in microphones.

The options available in Zoom Mic are: OFF, Wide, Narrow and Zoom.

The Zoom option has the narrowest angle of reception and records only in monaural.

Because the DVM technology is tailored to the recorder’s built-in stereo microphone, Zoom Mic is incompatible with Olympus accessory microphones and third-party microphones.

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How are files erased from the recorder?

Files in the Dictation, Audible, Podcast and Music folders can be erased from the recorder by selecting the file and then following this procedure:

  1. Press the F3 button.
  2. Press the Up arrow button once to select Erase, and then press the [OK] button.
  3. Select File Erase, and then press [OK].
  4. Press the Up arrow button to select Start, and then press [OK] to erase the file.

To erase all of the files in a folder, use the same procedure, but select Folder Erase instead of File Erase.

Note: Locked files and files that are set as read-only cannot be erased using this function.

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I want to clear my recorder of all files. How do I format the recorder?

The recorder should be formatted only by using the internal FORMAT function found in the System Menu. Formatting using the computer may corrupt system files needed to run the recorder and may delete the Voice Guide Data and Audible system files. When the recorder is connected to a computer, individual files can be deleted using My Computer without negative effects.

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How do I charge the recorder’s rechargeable battery?

The included LI-50B lithium-ion battery can be charged in a number of ways.

  1. AC power: This recorder is bundled with the A-515 AC adapter. Simply connect the recorder to the adapter and plug the adapter into an AC outlet.
  2. USB power: The battery can also be charged via the recorder’s USB port. Use the included USB cable to connect the recorder to a USB port mounted directly on a computer. Do not use a port on a USB hub. USB hubs split up the USB current, and the battery may not fully charge through a hub connection. This method is not available when the computer is turned off or is in Standby, Hibernate or Sleep mode.
  3. USB connecting to AC power: The battery can also be charged using the optional AC Adapter A-514, which has a USB port instead of a cord. To charge the battery this way, first enter the menu and change the Preferences > System Menu > USB Connection setting to AC. Next, plug the recorder’s USB cable into the A-514 adapter’s USB port. Finally, plug the adapter into an AC outlet.

    Note: When USB Connection is set to AC, the recorder cannot be recognized by a computer even if it is connected to the computer via its USB cable. Therefore, after charging the battery, it is important to reset USB Connection back to PC.
  4. External battery charger: The LI-50B battery can also be charged outside the recorder using the optional LI-50C Battery Charger, which can be ordered by clicking here.

While the recorder is charging, the orange LED indicator light will be on and the battery strength icon on the LCD will change to the charging icon. The LED light will turn off when charging has completed.

To purchase additional LI-50B batteries from The Olympus Store, click here.

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How should the recorder be disconnected from a Windows computer?

Any USB device should be disconnected from a Windows® computer using the [Safely Remove Hardware] icon located in the Taskbar in the lower right corner of the Desktop screen. The icon features a green arrow suspended above a device and pointing to the lower left.

Any open files should be closed before starting the disconnect process. Simply removing the device from the USB port without using the recommended disconnect procedure can result in corruption of files or firmware.

Double-clicking on the [Safely Remove Hardware] icon opens a dialog box and prompts the user to shut down the USB connection so that the device can be safely disconnected. Select the device to be disconnected by clicking once on its name, and then click on the [Stop] button.


Clicking on the [Stop] button lauches another dialog box to confirm the device(s) to be stopped. Clicking the [OK] button closes the USB connection.

The Desktop screen will display a message balloon above the Taskbar indicating that it is safe to disconnect the hardware.

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How should the recorder be disconnected from a Macintosh computer?

Any USB device should be disconnected from a Macintosh computer either by clicking on the EJECT button or dragging the drive icon that represents the recorder to the Trash.

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Will using an accessory microphone with an extended frequency range improve the quality of my recordings?

The recorder's built-in stereo microphone has an overall frequency response of 70 – 20,000 Hz, while its microphone jack’s overall frequency response is 40 – 23,000 Hz. Therefore, if you are recording signals that fall within the 40 to 70 Hz spectrum and/or between the 20,000 and 23,000 Hz spectrum, then you can improve the quality of your recordings by using an accessory microphone that can record frequencies between 40 Hz and 23,000 Hz. However, there will be no benefit to using an accessory microphone capable of recording frequencies below 40 Hz or above 23,000 Hz because the microphone jack will clip the signal at the upper and lower parameters.

Furthermore, the different recording modes modify the detail of the saved file data by saving some frequencies and discarding others. This is how the recorder is able to vary the potential recording time and use the built-in flash memory more efficiently. This means that, even though you may use a microphone capable of capturing very high or very low frequencies, the recorder will discard that information if it falls outside of the frequency range available to the selected recording mode.

The table below shows the overall frequency response of each recording mode when using the microphone jack and the built-in stereo microphone:

Recording Mode Overall Frequency Response
Using Microphone Jack Using Built-in Stereo Microphone
PCM 48 kHZ 40 Hz - 23,000 Hz 70 Hz - 20,000 Hz
PCM 44.1 kHZ 40 Hz - 21,000 Hz 70 Hz - 20,000 Hz
MP3 320 kbps 40 Hz - 20,000 Hz 70 Hz - 20,000 Hz
MP3 256 kbps 40 Hz - 20,000 Hz 70 Hz - 20,000 Hz
MP3 192 kbps 40 Hz - 19,000 Hz 70 Hz - 19,000 Hz
MP3 128 kbps 40 Hz - 17,000 Hz 70 Hz - 17,000 Hz
ST XQ mode 40 Hz - 19,000 Hz 70 Hz - 19,000 Hz
ST HQ mode 40 Hz - 16,000 Hz 70 Hz - 16,000 Hz
ST SP mode 40 Hz - 9,000 Hz 70 Hz - 9,000 Hz
HQ mode 40 Hz - 13,000 Hz 70 Hz - 13,000 Hz
SP mode 40 Hz - 8,000 Hz 70 Hz - 8,000 Hz
LP mode 40 Hz - 3,000 Hz 70 Hz - 3,000 Hz

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Is there an AC adapter available for the DM-2?

The DM-4 is bundled with the A-515 AC Adapter. The adapter can be used to power the recorder and also to charge the included rechargeable LI-50B battery.

The DM-4 is also compatible with the optional A-514 AC Adapter, which features a USB port instead of a traditional AC power cord. It can be used to power the DM-4 or charge its battery, but with the A-514 charging is accomplished via the recorder’s USB port instead of its AC input jack. To use the DM-4 with the A-514, you must first change the recorder’s Preferences > System Menu > USB Connection setting to AC. Next, connect the bundled USB cable to the USB ports on the DM-4 and AC-514. Finally, plug the adapter into an AC outlet.

Note: When USB Connection is set to AC, the recorder cannot be recognized by a computer even if it is connected to the computer via its USB cable. Therefore, after charging the battery, it is important to reset USB Connection back to PC.

Both adapters can be purchased directly from The Olympus Store. To order the A-515, click here. To order the A-514, click here.

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I formatted the recorder using my computer and the Voice Guidance Data is gone. Can I restore it?

If you format the recorder and erase the Voice Guidance data by mistake, or if you want to change its language, the Voice Guidance data can be copied from the OLYMPUS Sonority software to the recorder via either of the following procedures:

  • Uploading Voice Guidance data automatically

    OLYMPUS Sonority automatically detects the languages supported by a connected recorder and uploads the corresponding files not stored in the recorder. Voice Guidance languages that can be downloaded into the DM-2 are Japanese, English, French, German, Italian, Spanish, Russian, Finnish, Czech, Norwegian, Swedish, Portuguese, Greek, Danish, Polish, Dutch, Hindi and Urdu.

    Connect the recorder to the computer and open OLYMPUS Sonority.

    With the built-in Voice Guidance of the recorder turned on, OLYMPUS Sonority will automatically check the state of the Voice Guidance files in the recorder. If the recorder lacks any of the required files, the following dialog box will appear.

    Click the [OK] button. The Voice Guidance files will be uploaded.

  • Uploading Voice Guidance Data manually

    To manually upload Voice Guidance files in a desired language, perform the following steps: Connect the recorder to the computer and open OLYMPUS Sonority.

    Select the [Device] > [Upload Voice Guidance Files] menu option. The Transfer Voice Guidance Files dialog box will appear.

    Voice Guidance files that can be uploaded are listed in the drop-down list. Select the desired Voice Guidance language to upload, and then click on the [OK] button.

    The Voice Guidance files in the selected language will upload to the recorder. The Voice Guidance file set to the primary supported language in the recorder will be overwritten with the new Voice Guidance file in the selected language.

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How do I set the recorder back to the factory default settings?

To reset the recorder to the factory default settings, open the Preferences menu and then open the System Menu. Select Reset Settings, press the right arrow button on the keypad, press the up button to select Start, and then press the [OK] button to start the reset process.

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The battery ran out while I was recording a file, and now I can’t find or play the file. Why?

When a recording session begins, a file is created to contain the incoming audio content. This file remains open throughout the session until the recording is manually stopped. If the recorder lasts longer than five minutes, the recorder will save the audio content at five-minute intervals.

If the battery runs out during a recording session, only the portion of the recording that has been saved will be available for retrieval. For example, if a recording session is interrupted by power loss at the 37th minute, the audio file of the recording will contain only the first 35 minutes worth of content. The remaining two minutes worth of content is not available because it was never saved to the file. In the case of recordings that are shorter than five minutes, the entire recording will be lost because the file is not able to close due to the lack of power. 

It is crucial to change the battery once the battery indicator shows only one hash mark of power remaining. Removing the battery while the recorder is in use may also corrupt a file.

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