Sony CMT-MX550I Leaflet

CMT-MX550i/MX500i.GB.4-189-334-11(1)

When you turn off the system, the selected shuffle play mode (“SHUF” 

or “

 SHUF”) is cleared and the play mode returns to normal play 

mode (“

”).

If the USB device has more than one memory (for 

example, internal memory and a memory card), you can 

select which memory to use and then start playback. 

You cannot select a memory during playback. Make sure 

to select a memory before starting playback.

Use buttons on the unit to select a memory on the USB 

device.

Press FUNCTION  repeatedly to select the USB 

function.

Connect the USB device to the   (USB) port .

Press TOOL MENU , and then press ENTER .

Press

 /  repeatedly to select a memory 

number.
Proceed to step 5 if only one memory can be selected.

To cancel this operation, press  .

Press ENTER .

 When USB cable connection is necessary, connect the USB cable 

supplied with the USB device to be connected. See the operation 

manual supplied with the USB device to be connected for details on 

the operation method.

 It may take about 10 seconds before “Reading” appears depending 

on the type of USB device connected.

 Do not connect the system and the USB device through a USB hub.

 When the USB device is inserted, the system reads all the files on the 

USB device. If there are many folders or files on the USB device, it 

may take a long time to finish reading the USB device.

 With some connected USB devices, after an operation is performed, 

there may be a delay before it is performed by this system.

 Compatibility with all encoding/writing software cannot be 

guaranteed. If audio files on the USB device were originally encoded 

with incompatible software, those files may produce noise or 

interrupted audio, or may not play at all.

 This system cannot play audio files on the USB device in the 

following cases;

 when the number of audio files in a folder exceeds 999.

 when the total number of audio files on a USB device exceeds 999.

 when the number of folders on a USB device exceeds 999 

(including the “ROOT” folder and empty folders).

  These numbers may vary depending on the file and folder structure. 

Do not save other types of files or unnecessary folders on a USB 

device that has audio files.

 The system can play back to a depth of 8 folders only.

 This system does not necessarily support all the functions provided 

in a connected USB device.

 Resume play is cancelled when you turn off the system.

 Folders that have no audio files are skipped.

 The audio formats that you can listen to with this system are as 

follows:

 MP3: file extension “.mp3”

 WMA: file extension “.wma”

 AAC: file extension “.m4a”

  Note that even when file name has the correct file extension, if the 

actual file differs, the system may produce noise or may malfunction.

You can use the system as a battery charger for USB 

devices that have a rechargeable function when the 

system is on.

The charging begins when the USB device is connected 

to the   (USB) port . The charge status appears in 

the USB device display. For details, see the user’s guide of 

your USB device.

Note that the USB features are not available for North 

American model.

Select the CD or USB function.
Press FUNCTION +/  repeatedly.

Select the play mode.
Press PLAY MODE  repeatedly until “PGM” 

appears while the player is stopped.

Select the desired track or file number.
Press /  repeatedly until the desired track 

or file number appears.

When programming audio files, press   +/  

repeatedly to select the desired folder, and then select 

the desired file. 

Selected track or file number

Total playing time of the selected 

track or file

Program the selected track or file.
Press    to enter the selected track or file.

Repeat steps 3 through 4 to program additional 

tracks or files, up to a total of 25 tracks or files.

To play your program of tracks or files, press  .
The program remains available until you open the disc 

tray  or remove the USB device.  

To play the same program again, press  .

Press PLAY MODE  repeatedly until “PGM” 

disappears while the player is stopped.

Press CLEAR  while the player is stopped.

Press DISPLAY  repeatedly.

Prepare the sound source.
Connect additional audio component to the AUDIO 

IN jack  on the unit using an audio analog cord 

(not supplied).

Turn down the volume.
Press VOLUME  .

Select the AUDIO IN function.
Press FUNCTION +/  repeatedly.

Start playback.
Start playback of the connected component and adjust 

the volume.

The system may enter standby mode automatically if the volume 

level of the connected component is too low. Adjust the component’s 

volume accordingly. See “To turn off the automatic standby function.”

Adjust the volume VOLUME +/ .
Generate a more 

dynamic sound 

(Dynamic Sound 

Generator X-tra)

DSGX  on the unit.

Set the sound 

effect

EQ  repeatedly to select “BASS” 

or “TREBLE,” and then press / 

 to adjust the level.

Change 

information on 

the display

1)

DISPLAY  repeatedly when the 

system is on.

Change Display 

mode (see below.)

DISPLAY  repeatedly when the 

system is off.

2)

 

1)

 For example, you can view CD/MP3 disc information or the USB 

device information (except for North American model), such as;

 track or file number during normal play.

 track or file name (“ ”) during normal play.

 artist name (“ ”) during normal play.

 album or folder name (“

”) during normal play.

 total playing time and total number of tracks on the CD-DA 

disc (only when normal play mode is selected and the player is 

stopped).

 total number of folders (albums) on the MP3 disc or the USB 

device (only when normal play mode is selected and the player is 

stopped).

 volume label if it exists on the MP3 disc or the USB device (only 

when normal play mode is selected and the player or USB device 

is stopped).

  You can also view DAB/DAB+ station information (CMT-MX550i 

only) such as the service name, channel label, preset number, 

frequency, DLS (Dynamic Label Segment), or ensemble label.

2)

 The STANDBY indicator  on the unit lights up when the system is off.

The system offers the following display modes.
Display mode

Demonstration

The demonstration is turned on.

Power Saving 

Mode

2)

The display is turned off to conserve 

power. The timer and clock continue 

to operate.

Clock

3)

The clock is displayed.

1)

 The STANDBY indicator  on the unit lights up when the system is off.

2)

 You cannot set the clock in Power Saving Mode.

3)

 The clock display automatically turns to Power Saving Mode after 8 

seconds.

 Characters that cannot be displayed appear as “_”.

 The following are not displayed;

 total playing time for an MP3 disc and a USB device (except for 

North American model).

 remaining playing time for an MP3 file.

 The following are not displayed correctly;

 elapsed playing time of an MP3 file encoded using VBR (variable 

bit rate).

 folder and file names that do not follow either the ISO9660 

Level 1, Level 2 or Joliet in the expansion format.

 The following are displayed;

 remaining playing time for a track.

 ID3 tag information for MP3 files when ID3 version 1 and 

version 2 tags are used (ID3 version 2 tag information display has 

priority when both ID3 version 1 and version 2 tags are used for a 

single MP3 file).

The following is also displayed;

 up to 8 characters of service name, up to 128 characters of DLS 

(Dynamic Label Segment) and up to 16 characters of ensemble 

label.

The system offers two timer functions. If you use both 

timers, the Sleep Timer has priority. 

You can fall asleep to music. This function works even if 

the clock is not set.

Press SLEEP  repeatedly. If you select “AUTO,” the 

system automatically turns off after the current disc or 

USB device stops, or within 100 minutes.

You can wake up to CD, FM reception, DAB/DAB+ 

reception (CMT-MX550i only), iPod/iPhone or USB 

device (except for North American model)

 

at a preset 

time. Make sure you have set the clock.

Prepare the sound source.
Prepare the sound source, and then press VOLUME 

+/  to adjust the volume.

To start from a specific CD track or audio file, create 

your own program.

Select the timer set mode.
Press TIMER MENU .

Set the play timer.
Press /  repeatedly to select “PLAY SET?,” then 

press   .

Set the time to start playback.
Press /  repeatedly to set the hour, then press   

. Use the procedure above to set the minutes.

Use the same procedure as in step 4 to set the time 

to stop playback.

Select the sound source.
Press /  repeatedly until the desired sound 

source appears, then press   .

Turn off the system.
Press  . The system automatically turns on 

before the preset time.

If the system is on at the preset time, the Play Timer 

will not play. Do not operate the system from the time 

the system turns on until the playback starts.

Press TIMER MENU .

Press 

/  repeatedly to select “TIMER SEL?,” and 

then press   .

Press 

/  repeatedly to select “PLAY SEL?,” and 

then press   .

Repeat the same procedure as above until “TIMER OFF?” 

appears in step 3, and then press   .

Start over from step 1.
Notes for the iPod/iPhone user

 Make sure the iPod/iPhone is not playing when using the Play 

Timer.

 The Play Timer may not be activated depending on the status of the 

connected iPod/iPhone.

The Play Timer setting remains as long as the setting is not cancelled 

manually.

Make sure the power cord and speaker cords are 

correctly and firmly connected.

Find your problem in the checklist below, and take 

the indicated corrective action.
If the issue persists, contact your nearest Sony dealer.

Immediately unplug the power cord, and check the 

following items.

 Are the + and  speaker cords short-circuited?

 Is anything blocking the ventilation holes of the 

system?

 Is the iPod/iPhone connector  short-circuited?

After the STANDBY indicator  stops flashing, 

reconnect the power cord, and turn on the system. If 

the issue persists, contact your nearest Sony dealer.

 Press DISPLAY  once while the system is off. The 

demonstration disappears.

 Is the power cord plugged in?

 This is not a malfunction. The system enters standby 

mode automatically in about 30 minutes when there is 

no operation or audio signal output. See “To turn off 

the automatic standby function.”

 If about a minute elapses with no operation, the clock 

setting or Play Timer setting is cancelled automatically. 

Perform the operation again from the beginning.

 Are the + and  speaker cords short-circuited?

 Are you using only the supplied speakers?

 Is anything blocking the ventilation holes of the system?

 The specified station may have temporarily stopped 

broadcast.

 Place the speakers as symmetrically as possible.

 Connect only the supplied speakers.

 Move the system away from sources of noise.

 Connect the system to a different wall outlet.

 Install a noise filter (available separately) to the power 

cord.

 The reading process can take a long time in the 

following cases.

 There are many folders or files on the USB device.

 The file structure is extremely complex.

 The memory capacity is excessive.

 The internal memory is fragmented.

 Send the music data to the USB device again, as the 

data stored in the USB device may have been corrupted.

 The character codes that can be displayed by this 

system are numbers and alphabets only. Other 

characters are not displayed correctly.

 Turn off the system and reconnect the USB device, then 

turn on the system.

 Check the information on the websites about 

compatible USB devices with URLs listed under 

“Playing a file of the USB device.”

 The USB device does not work properly. Refer to the 

USB device operation manual for how to deal with this 

problem.

 Turn off the system and reconnect the USB device, then 

turn on the system.

 Check the information on the websites about 

compatible USB devices with URLs listed under 

“Playing a file of the USB device.”

 Press   to start playback.

 Set the play mode to Normal Play mode.

 The audio file does not have the extension “.mp3,” 

“.wma” or “.m4a”.

 The data is not stored in MP3/WMA/AAC format.

 USB storage devices formatted with file systems other 

than FAT16 or FAT32 are unsupported.*

 If you use a partitioned USB storage device, only files 

on the first partition can be played.

 Files that are encrypted or protected by passwords, etc. 

cannot be played back.

*  This system supports FAT16 and FAT32, but some USB storage 

devices may not support all of these FAT. For details, see the 

operation manual of each USB storage device or contact the 

manufacturer.

 Connect the antenna properly.

 Find a location and an orientation that provide good 

reception, and then set up the antenna again.

 Keep the antennas away from the speaker cords and the 

power cord to avoid picking up noise.

 Turn off nearby electrical equipment.

 Check all antenna connections, then perform the DAB 

Automatic Scan procedure (see “Reception of DAB/

DAB+ radio station”).

 The current DAB/DAB+ service may not be available. 

Press +/  to select a different service.

 If you have moved to another area, some services/

frequencies may have changed and you may not be able 

to tune into your usual broadcast. Perform the DAB 

Automatic Scan procedure to re-register the contents 

of broadcasts. (Performing this procedure clears all 

previously stored presets.)

Turn off CD player power by using the system’s power 

management function. By default, CD player power is 

turned on.

Use buttons on the unit to turn off the CD player power.

Press FUNCTION  repeatedly to select the CD 

function.

Press   to turn off the system.

After “STANDBY” stops flashing, press DISPLAY  

to display the clock, and then press   while 

holding down 

 + , until “CD POWER OFF” 

appears.
With CD player power turned off, access time is 

increased. To turn on CD player power, repeat the 

procedure until “CD POWER ON” appears.

If the system still does not operate properly, reset the 

system to factory settings.

Use buttons on the unit to reset the unit to its factory 

default settings.

Disconnect and reconnect the power cord, and then 

turn on the system.

While holding down ENTER , hold down   

until “RESET” appears.
All user-configured settings, such as preset radio 

stations, timer, and the clock, are deleted.

This system is equipped with an automatic standby 

function. With this function, the system enters standby 

mode automatically in about 30 minutes when there is no 

operation or audio signal output.

By default, the automatic standby function is turned on.

Use buttons on the unit to turn off the automatic standby 

function.
  Hold down   while the system is on, until 

“AUTO STBY OFF” appears.
To turn on the function, repeat the procedure until 

“AUTO STBY ON” appears.

 “AUTO STBY” appears in the display for 2 minutes before the 

system enters standby mode.

 The automatic standby function is invalid for the tuner function 

(FM/DAB), even when you have enabled it.

 The system may not enter standby mode automatically in the 

following cases;

 while an audio signal is being detected.

 during playback of audio tracks or files.

 while the preset Play Timer or Sleep Timer is in process.

CD Over : You have reached the end of the disc while 

pressing   during playback or pause.

Data Error : You tried to play an unplayable file on the 

USB device.

Error : The USB device could not be recognized or an 

unknown device is connected.

LOCKED : The disc tray does not open. Contact your 

nearest Sony dealer.

No Device : No USB device is connected or the 

connected USB device has been stopped.

No Disc : There is no disc in the player, or you have 

loaded a disc that cannot be played.

No Memory : The memory media which you have 

selected as playback source is not inserted in the USB 

device.

No Preset (DAB/DAB+ only) : There is no stored preset 

station.

No Service (DAB/DAB+ only) : There is no supported 

DAB/DAB+ broadcast in your country or region.

No Step : All of the programmed tracks have been 

erased.

No Text (DAB/DAB+ only) : There is no text information 

in the received service.

No Track : Playable file on the USB device is not loaded 

in the system.

Not in Use : You tried to perform a specific operation 

under conditions where that operation is prohibited.

Not Supported : An unsupported USB device is 

connected.

Push STOP! : You pressed PLAY MODE  during 

playback.

Step Full! : You tried to program more than 25 tracks or 

files (steps).

TIME NG! : The Play Timer start and end times are set to 

the same time.

 Audio CD

 CD-R/CD-RW (audio data/MP3 files)

 CD-ROM

 CD-R/CD-RW other than those recorded in music CD 

format or MP3 format conforming to ISO9660 Level 

1/Level 2, Joliet

 CD-R/CD-RW recorded in multisession that have not 

ended by “closing the session”

 CD-R/CD-RW of poor recording quality, 

CD-R/CD-RW that have scratches or are dirty, 

or CD-R/CD-RW recorded with an incompatible 

recording device

 CD-R/CD-RW which is finalized incorrectly

 Discs containing files other than MPEG 1 Audio Layer-

3 (MP3) files

 Discs of non-standard shape (for example, heart, 

square, star)

 Discs that have adhesive tape, paper, or sticker attached 

to them

 Rental or used discs with attached seals where the glue 

extends beyond the seal

 Discs that have labels printed using ink that feels tacky 

when touched

 Before playing, wipe the disc with a cleaning cloth from 

the center out to the edge.

 Do not clean discs with solvents, such as benzine, 

thinner, or commercially available cleaners or anti-

static spray intended for vinyl LPs.

 Do not expose discs to direct sunlight or heat sources 

such as hot air ducts, nor leave it in a car parked in 

direct sunlight.

 Completely disconnect the power cord (mains lead) 

from the wall outlet (mains) if it is not going to be used 

for an extended period of time. When unplugging the 

unit, always grip the plug. Never pull the cord itself.

 Should any solid object or liquid get into the system, 

unplug the system, and have it checked by qualified 

personnel before operating it again.

 The AC power cord can be changed only by a qualified 

service facility.

 Do not place the system in an inclined position or in 

locations that are extremely hot, cold, dusty, dirty, or 

humid or lacking adequate ventilation, or subject to 

vibration, direct sunlight or a bright light.

 Be careful when placing the unit or speakers on 

surfaces that have been specially treated (for example, 

with wax, oil, polish) as staining or discoloration of the 

surface may result.

 If the system is brought directly from a cold to a warm 

location or is placed in a very damp room, moisture 

may condense on the lens inside the CD player, and 

cause the system to malfunction. In this situation, 

remove the disc, and leave the system turned on for 

about an hour until the moisture evaporates.

 Heat buildup on the unit during operation is normal 

and is not cause for alarm.

 Do not touch the cabinet if it has been used 

continuously at a high volume because the cabinet may 

have become hot. 

 Do not obstruct the ventilation holes.

This speaker system is not magnetically shielded, and 

the picture on nearby TV sets may become magnetically 

distorted. In this situation, turn off the TV, wait 15 to 

30 minutes, and turn it back on. 

If there is no improvement, move the speakers far away 

from the TV.

Clean this system with a soft cloth slightly moistened 

with a mild detergent solution. Do not use any type of 

abrasive pads, scouring powder, or solvents, such as 

thinner, benzine, or alcohol.

Main unit
AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

(The United States model only)

With 6 ohm loads, both channels driven, from 120  10,000 Hz; rated 30 watts 

per channel minimum RMS power, with no more than 10% total harmonic 

distortion from 250 milliwatts to rated output.
Amplifier section
European model:

DIN power output (rated): 25 watts + 25 watts (6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference): 30 watts + 30 watts (6 ohms at 

1 kHz, 10% THD)

Music power output (reference): 30 watts + 30 watts (6 ohms at 1 kHz, 10% 

THD)

Other models:

DIN power output (rated): 25 watts + 25 watts (6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference): 30 watts + 30 watts (6 ohms at 

1 kHz, 10% THD)

AUDIO IN (stereo mini jack): Sensitivity 700 mV, impedance 47 kilohms

SPEAKERS: Accepts impedance of 6 ohms

System: Compact disc and digital audio system

Laser Diode Properties

Emission Duration: Continuous

Laser Output*: Less than 44.6µW

* This output is the value measurement at a distance of 200mm from the 

objective lens surface on the Optical Pick-up Block with 7mm aperture.

Frequency response: 20 Hz  20 kHz

Signal-to-noise ratio: More than 90 dB

Dynamic range: More than 90 dB
Tuner section

FM tuner section:

FM stereo, FM superheterodyne tuner

Tuning range:

North American model: 87.5 MHz  108.0 MHz (100 kHz step)

Other models: 87.5 MHz  108.0 MHz (50 kHz step)

Antenna: FM lead antenna

Antenna terminals: 75 ohms unbalanced

Intermediate frequency: 10.7 MHz

DAB/DAB+ tuner section (CMT-MX550i only):

FM stereo, DAB/FM superheterodyne tuner

Frequency range*

Band-III: 174.928 (5A) MHz  239.200 (13F) MHz

* For details, see “DAB/DAB+ frequency table” below.

Antenna: DAB/FM lead antenna

Antenna terminal: 75 ohms, F female

DAB/DAB+ frequency table (Band-III)

174.928 MHz

5A

209.936 MHz

10A

176.640 MHz

5B

211.648 MHz

10B

178.352 MHz

5C

213.360 MHz

10C

180.064 MHz

5D

215.072 MHz

10D

181.936 MHz

6A

216.928 MHz

11A

183.648 MHz

6B

218.640 MHz

11B

185.360 MHz

6C

220.352 MHz

11C

187.072 MHz

6D

222.064 MHz

11D

188.928 MHz

7A

223.936 MHz

12A

190.640 MHz

7B

225.648 MHz

12B

192.352 MHz

7C

227.360 MHz

12C

194.064 MHz

7D

229.072 MHz

12D

195.936 MHz

8A

230.784 MHz

13A

197.648 MHz

8B

232.496 MHz

13B

199.360 MHz

8C

234.208 MHz

13C

201.072 MHz

8D

235.776 MHz

13D

202.928 MHz

9A

237.488 MHz

13E

204.640 MHz

9B

239.200 MHz

13F

206.352 MHz

9C

208.064 MHz

9D

* Frequencies are displayed to two decimal places on this system.

Compatible iPod/iPhone models:

 iPod touch 2nd generation

 iPod touch 1st generation

 iPod classic 120 GB, 160 GB (2009)

 iPod classic 160 GB (2007)

 iPod classic 80 GB

 iPod nano 5th generation (video camera) 

 iPod nano 4th generation (video) 

 iPod nano 3rd generation (video) 

 iPod nano 2nd generation (aluminum) 

 iPod nano 1st generation

 iPod 5th generation (video)

 iPod 4th generation (color display) 

 iPod 4th generation

 iPod mini

 iPhone

 iPhone 3G

 iPhone 3GS

Supported bit rate:

MP3 (MPEG 1 Audio Layer-3): 32 kbps  320 kbps, VBR

WMA: 48 kbps  192 kbps, VBR

AAC: 48 kbps  320 kbps

Sampling frequencies:

MP3 (MPEG 1 Audio Layer-3): 32/44.1/48 kHz

WMA: 44.1 kHz

AAC: 44.1 kHz

 (USB) port: Type A, maximum current 500 mA

Speaker system: 2 way speaker system, Bass reflex

Speaker units:

Woofer 100 mm, cone type

Tweeter 40 mm, cone type

Rated impedance: 6 ohms

Dimensions (W/H/D):

North American model: Approx. 140 mm × 240 mm × 200 mm

Other models: Approx. 150 mm × 240 mm × 220 mm

Mass: Approx. 2.0 kg net per speaker 
General

Power requirements:

North American model: AC 120 V, 60 Hz

Other models: AC 220 V  240 V, 50/60 Hz

Power consumption: 33 watts

Dimensions (W/H/D) (excl. speakers): 

Approx. 309 mm × 122 mm × 247 mm

Mass (excl. speakers): Approx. 2.9 kg
Supplied accessories: Remote Commander (1), R6 (Size AA) batteries (2), FM 

lead antenna (1) (CMT-MX500i), DAB/FM lead antenna (2) (CMT-MX550i), 

Speaker cords (2) (except for North American model), Speaker pads (8), Dock 

Adapters for iPhone models (1 set)
Design and specifications are subject to change without notice.

 Standby power consumption: 0.5 W

 Halogenated flame retardants are not used in the certain printed 

wiring boards.

 Remove any obstacles between the remote and the 

remote sensor  on the unit, and position the unit 

away from fluorescent lights.

 Point the remote at the system’s sensor.

 Move the remote closer to the system.



 The STANDBY indicator  may not turn off 

immediately after unplugging the power cord. The 

indicator will turn off after about 40 seconds. This is not 

a malfunction.

 Wipe the disc clean, and replace it.

 Move the system to a location away from vibration (for 

example, on top of a stable stand).

 Move the speakers away from the system, or place them 

on separate stands. At high volume, speaker vibration 

may cause the sound to skip.

 Return to Normal Play by pressing PLAY MODE  

repeatedly until both “PGM” and “SHUF” disappear.

 The following discs can increase the time it takes to 

start playback;

 a disc recorded with a complicated tree structure.

 a disc recorded in multisession mode.

 a disc that has not been finalized (a disc to which data 

can be added).

 a disc that has many folders.

 Make sure the iPod/iPhone is connected securely.

 Make sure the iPod/iPhone is playing music.

 Adjust the volume.

 Make sure the iPod/iPhone is connected securely.

 Turn down the volume.

 Set the “EQ” setting of the iPod/iPhone to “Off” or 

“Flat.”

 Make sure the iPod/iPhone is connected securely.

 Make sure the iPod/iPhone is updated with the latest 

software. If not, update the iPod/iPhone before using 

with the system.

 Because the operation of the system and the iPod/

iPhone are different, you may not operate the iPod/

iPhone using buttons on the remote or unit. In this 

case, use the control buttons on the iPod/iPhone.

 Make sure the iPod/iPhone is connected securely.

 You can use the system as a battery charger for iPod/

iPhone only when the system is on.

 Adjust the ring volume on the iPhone.

 You cannot charge an iPod/iPhone and the USB device 

at the same time.

 If you connect an unsupported USB device, the 

following problems may occur. Check the information 

on the websites about compatible USB devices with 

URLs listed under “Playing a file of the USB device.”

 The USB device is not recognized.

 File or folder names are not displayed on this system.

 Playback is not possible.

 The sound skips.

 There is noise.

 A distorted sound is output.

 A problem has been detected with the level of electrical 

current from the   (USB) port . Turn off the system 

and remove the USB device from the   (USB) port 

. Make sure there is no problem with the USB device. 

If this display pattern persists, contact your nearest 

Sony dealer.

 The USB device is not connected correctly. Turn off the 

system, then reconnect the USB device.

 Turn off the system, then reconnect the USB device.

 The music data itself contains noise, or the sound is 

distorted. Noise may have been entered when creating 

music data due to the conditions of the computer. 

Create the music data again.

 The bit rate used when encoding the files was low. Send 

files encoded with higher bit rates to the USB device.