MP3 & WMA overview

Notes on MP3 and WMA:

￿￿MP3 is short for MPEG Audio Layer 3 and refers to an audio compression technology standard.

￿￿This product allows playback of MP3 files on CD-ROM, CD-R or CD-RW discs.

￿￿The unit can read MP3 files written in the format compliant with ISO 9660. However it does not support the MP3 data written by the method of packet write.

￿￿The unit can not read an MP3 file that has a file extension other than “.mp3”.

￿￿If you play a non- MP3 file that has the “.mp3” extension, you may hear some noise.

￿￿In this manual, we refer to what are called “MP3 file” and “folder” in PC terminology as “track” and “album”, respectively.

￿￿Maximum number of directory level is 8, including the root directory. Maximum number of files and folders per disc is 256.

￿￿The unit may not play tracks in the order of Track numbers.

￿￿The unit plays only the audio tracks if a disc contains both audio tracks and MP3 files.

￿￿When playing a disc of 8 kbps or “VBR”, the elapsed playing time in the display window will not be correct and also the intro play may not function properly. “VBR”: Variable Bit Rate.

￿￿The unit supports the playback of WMA files. The playback of ID3 tags for WMA format is not guaranteed, it depends on versions and availability of Cyrillic alphabet.

￿￿WMA (Windows Media Audio) – music data compression format, created by Microsoft Corporation. This format uses coding algorithm for compression of initial audio-record, greatly decreasing the file size, but, saving the good sound quality even when the bit rate is low (for example, 64 Kbit/s).

￿￿Remember that the unit may not play the tracks in order they are written on disc.

Notes on creating your own CD-Rs or CD-RWs containing MP3 files

-To enjoy high quality sound, we recommend converting to MP3 files with a sampling frequency of 44.1 kHz and a fixed bit rate o f 128 kbps.

-DO NOT store more than 256 MP3 files per disc.

-For ISO 9660 - compliant format, the maximum allowable depth of nested folders is 8, including the root directory (folder).

-When CD-R disc is used, playback is possible only for discs, which have been finalized.

-Make sure that when MP3 CD-R or CD-RW is burned that it is formatted as a data disc and NOT as an audio disc.

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SoundMax SM-CMD3001 instruction manual MP3 & WMA overview