NX604/FX503 51
English
MP3 files
 
●
ID3-Tag: Display of Ver1.x, 2.x album 
(displayed as Disc Title), track (displayed 
as Track Title) and artist (displayed as 
Track Artist) are supported.
 
●
Emphasis: Supported only when playing 
44.1 kHz files
 
●
Playable sampling frequencies
MPEG1: 44.1 kHz/48 kHz/32 kHz
MPEG2: 22.05 kHz/24 kHz/16 kHz
MPEG2.5: 11.025 kHz/12 kHz/8 kHz
 
✽
In terms of audio quality, 44.1 kHz or 
higher is recommended.
 
●
Playable bitrates
MPEG1: 32 kbps to 320 kbps/VBR
MPEG2: 8 kbps to 160 kbps/VBR
MPEG2.5: 8 kbps to 160 kbps/VBR
 
✽
In terms of audio quality, 128 kbps or 
higher is recommended.
 
●
Jumping sometimes occurs with files 
recorded at the following sampling 
frequencies and bitrates:
Sampling frequency: 16 kHz or less
Bitrate: 8 kbps or less
 
●
MP3i (MP3 interactive) and mp3 PRO 
format are not supported.
 
●
Skipping sometimes occurs depending 
the data content of the MP3 file.
 
●
Files with a short recording time 
sometimes cannot be played.
 
●
When discs (NX604 only)/microSD 
cards/USB memory contain large data 
other than music data, tunes sometimes 
cannot be played.
 
●
Display of the play time sometimes 
deviates when low bitrate files are 
played, or fast-forwarded or rewound.
 
●
When TAG information is changed in TAG 
editing software other than Windows 
Media Player or iTunes
®
, TAGs are 
sometimes not displayed properly.
WMA files
 
●
Characters in album names sometimes 
are corrupted depending on the software 
on the PC where the names were made.
 
●
WMA9 Professional, WMA9 Voice and 
WMA9 lossless format are not supported.
 
●
When discs (NX604 only)/microSD 
cards/USB memory contain large data 
other than music data, tunes sometimes 
cannot be played.
 
●
Display of the play time sometimes 
deviates depending on the data content 
of the WMA file. Also, skipping or 
jumping sometimes occurs partially or 
noise sometimes occurs depending on 
the bitrate.
 
●
The sampling frequency and bitrates 
that can be played differ according to 
the recording version. Refer to the table 
below.
Bitrate 
(kbps)
Discs
microSD cards/
USB memory
Sampling frequency (kHz)
320 44.1 -
256 44.1 -
192 48/44.1 44.1
160 48/44.1 44.1
128 48/44.1 44.1
96 48/44.1 44.1
80 44.1 44.1
64 48/44.1 44.1/32
48 44.1/32 44.1/32
44 - 32
Bitrate 
(kbps)
Discs
microSD cards/
USB memory
Sampling frequency (kHz)
40 32 32
36 - 32
32 44.1/ 
32/22.05
48/44.1/
32/22.05
22 22.05 32/22.05
20 44.1/32/ 
22.05/16
44.1/32/
22.05/16
16 22.05/16 22.05/16
12 16/8 16/8
10 16/11.025 16/11.025
8 11.025/8 11.025
✽
 
/8
✽
68 8
✽
58 8
✽
VBR 44.1 48/44.1
 
✽
Jumping sometimes occurs.
Folder structure of discs
The maximum number of folders, files and 
tracks on discs are as follows:
Folders: 255 (including root)
Files: 512
Tracks:  255 per folder
The following is an illustration of a disc 
recorded with MP3 and WMA files (example, 
layers 1 to 4 of the folder hierarchy).
(1)--  Song A
(2)
(3)--
 Song B
(4)
(5)--
 Song C
(6)
(7)
(8)--
 Song D
(9)
(10)--
 Song E
(11)
(12)
(13)--
 Song F
(14)
(15)--
 Song G
(16)
Level 1
(Root)
Level 
2
Level 
3
Level 
4
Folders without tunes are skipped to 
determine the play order.
The play order in the case of the above figure 
becomes (1)
p
(3)
p
(5)
p
(8)
p
(10)
p
(13)
p
(15).
Notice
s)NTHECASEOFDISCSPLAYINGFILESDOWNTO
EIGHTLAYERSINCLUDINGTHEROOTDIRECTORY
ISSUPPORTEDTHOUGHITMAYTAKETIME
UNTILPLAYSTARTSWHENTHEDISCHASLOTSOF
FOLDERS