ONKYO CR-425UKD 用户手册

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The CR-525UKD can play back MP3 and WMA files 
that have been stored on USB mass storage devices, e.g., 
USB flash drives and MP3 players.

For USB mass storage device playback, the CD receiver 
supports the following music file formats.

■ MP3
• MP3 files must be MPEG-1 Audio Layer 3 format 

with a sampling rate of 32 kHz, 44.1 kHz, and 48 kHz 
and a bit-rate of between 32 kbps and 320 kbps.
Incompatible files cannot be played.

• Variable bit-rate (VBR) MP3 files are supported.

(Playing times may not display correctly.)

• MP3 files must have a “.mp3” or “.MP3” filename 

extension.

■ WMA
WMA stands for Windows Media Audio and is an audio 
compression technology developed by Microsoft Corpo-
ration. The CD receiver supports WMA format that con-
form to the WMA ver.9 standard.
• WMA files must have the copyright option turned off.
• Sampling rates of 32 kHz, 44.1 kHz, and 48 kHz and 

bitrates of between 48 kbps and 320 kbps, are sup-
ported. Incompatible files cannot be played.

• Variable bit-rates (VBR) are supported. (Playing times 

may display incorrectly with VBR.)

• WMA files must have a “.wma” or “.WMA” filename 

extension.

• Protected WMA music files on an MP3 player cannot 

be played.

• The CD receiver supports USB mass storage devices 

that support the USB Mass Storage Class*.

• Playback may not be possible with some USB devices 

even if they conform to the USB Mass Storage Class*.

• USB mass storage devices formatted with the FAT16 

or FAT32 file system are supported.

• If the USB mass storage device has been partitioned, 

only music files in the first partition can be played.

• Each folder may contain up to 500 music files, and 

folders may be nested up to eight levels deep.

• USB hubs and USB mass storage devices with hub 

functions are not supported.

• Onkyo accepts no responsibility whatsoever for the 

loss or damage to data stored on a USB mass storage 
device when that device is used with the CD receiver.
We recommend that you back up your important 
music files beforehand.

• The CD receiver supports USB MP3 players that sup-

port the USB Mass Storage Class standard*. Note that 
not all USB MP3 players support the USB Mass Stor-
age Class standard*. Refer your USB MP3 player’s 
instruction manual for details.

• MP3 players containing music files that are managed 

with special music software, and iPods containing 
music files managed with iTunes are not supported.
To listen to iPod music on a CD receiver, connect an 
optional Onkyo RI Dock to the CD receiver 
(see page 23).

• Recording is not possible from the CD receiver to a 

USB mass storage device.

*

USB Mass Storage Class standard allows USB mass storage 
devices to be connected to computers without the need for spe-
cial drivers or software.

On the USB mass storage device, MP3 or WMA files 
may be organized in a hierarchically, with folders con-
taining files and subfolders, as shown below.
On the CR-525UKD, all folders appear at the same level 
regardless of the hierarchy.

If you don’t select a specific music file or folder for play-
back, all of the music files on the USB mass storage 
device will be played in numerical order starting with 
file #1.

File #11

File #1

File #10

Folder #3

File #12

Root

Folder #1

Folder #2

File #13

Folder #4

File #14

File #18