JVC Th A55 Instructions

							Tuner operations
28
2Press MEMORY.
The channel number position starts flashing on the display 
window for about 5 seconds.
While the channel number position is flashing:
3Press number button(s) (1-10, +10) to 
select a channel number.
The channel number and the CH indicator start flashing.
Examples:
For channel number 3: Press 3.
For channel number 14: Press +10, then 4.
(For FM stations only)
For channel number 24: Press +10 twice, then 4.
For channel number 30: Press +10 twice, then 10.
While the selected number is flashing:
4Press MEMORY again.
The selected number stops flashing.
The station is assigned to the selected preset number.
5Repeat steps 1 to 4 until you store all 
the stations you want.
To erase a stored preset station
Storing a new station to a used number erases the previously stored 
one.
7To tune in to a preset station
On the remote control:
1Press FM/AM repeatedly to select the 
band.
Each time you press the button, the band alternates between 
FM and AM (MW).
2Press number button(s) (1-10, +10) to 
select a preset channel number.
Examples:
For channel number 3: Press 3.
For channel number 14: Press +10, then 4.
(For FM stations only)
For channel number 24: Press +10 twice, then 4.
For channel number 30: Press +10 twice, then 10.When the stereo FM program currently tuned in is noisy, you can 
change the FM reception mode to improve the reception.
• You can store the FM reception mode for each preset station. See 
“Preset tuning” (Apg. 27).
7While listening to an FM station
On the remote control:
Press FM MODE.
The FM reception mode appears on the display window.
Each time you press the button, the FM reception mode alternates 
between “AUTO MUTING” and “MONO”.
• AUTO MUTING:
When a program is broadcast in stereo, you will hear stereo 
sound. (The ST indicator lights on the display window.) When in 
monaural, you will hear monaural sound. This mode is also 
useful to suppress static noise between stations. The AUTO 
MUTING indicator lights on the display window.
MONO:
Reception will be improved although you will lose the stereo 
effect. (The ST indicator goes off.) In this mode, you will hear 
noise until you are tuned in to a station. (The AUTO MUTING 
indicator also goes off.)
When listening to an AM (MW) broadcast with a lot of noise 
interference, you can change the Beat Cut mode to reduce the 
noise.
7While listening to an AM (MW) station
On the remote control:
Press FM MODE.
The current Beat Cut mode appears on the display window.
Each time you press the button, the Beat Cut mode alternates 
between “BEAT CUT 1” and “BEAT CUT 2”.
 Choose “BEAT CUT 1” or “BEAT CUT 2” according to which 
gives clearer sound.
Selecting the FM 
reception mode
Reducing the noise of AM 
(MW) broadcast
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							Tuner operations
29
RDS allows FM stations to send an additional signal along with 
their regular program signals. For  example, the stations send their 
station names, as well as inform ation about what type of program 
they broadcast, such as sports or music, etc.
When tuned in to an FM station  which provides the RDS service, 
the RDS indicator lights up on the display window.
With the system, you can receive the following types of RDS 
signals:
PS (Program Service): Shows  commonly known station names.
PTY (Program Type): Shows types of broadcast programs.
RT (Radio Text): Shows text  messages the station sends.
Enhanced Other Network: See page 31.
NOTE
• RDS is not available for AM (MW) broadcasts.
 RDS may not operate correctly if th e station tuned is not transmitting 
RDS signal properly or if the signal strength is weak.
IMPORTANT
Before using the remote control for the following 
operation; 
1 Set the remote control mode selector to  AUDIO .
2Press  FM/AM.
7To show the RDS signals information
On the remote control:
Press RDS DISPLAY wh ile listening to an 
FM station.
Each time you press the button,  the indication on the display 
window changes to show you the following information:
]  PS  ] PTY  ] RT  ] Frequency (Normal indication)  ] 
(back to the beginning)
PS (Program Service):
While searching, “PS” appears a nd then the station names will be 
displayed. “NO PS” appears if no signal is sent.
PTY (Program Type):
While searching, “PTY” appears and  then the type of the broadcast 
program will be displayed. “NO PTY ” appears if no signal is sent.
RT (Radio Text):
While searching, “RT” appears a nd then text messages the station 
sends will be displayed.  “NO RT” appears if no signal is sent.
Frequency:
Station frequency (non-RDS service).
About characters shown on the display window
When PS, PTY, or RT signals a ppear on the display window, some 
special characters and marks ma y not be displayed correctly. 
NOTE
 If searching finishes at once, “PS” , “PTY”, and “RT” will not appear 
on the display window.
Using the RDS (Radio 
Data System) when 
receiving FM stations
RDS indicator
Remote control mode selector
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Searching for a program by PTY codes
One of the advantages of the RDS service is that you can locate a 
particular kind of program from the preset channels (Apg. 27) by 
specifying the PTY codes.
7 To search for a program using the PTY codes
NOTE
Before you start operation;• The PTY Search is only appl icable to preset stations.
 To stop searching any time  during the process, press PTY SEARCH 
while searching.
 There is a time limit in doing the following steps. If the setting is  canceled before you finish, start from step 1 again.
On the remote control:
1Press PTY SEARCH wh ile listening to 
an FM station.
“PTY SELECT” flashes on the display window.
While “PTY SELECT” is flashing:
2Press PTY ª or PTY · until the PTY 
code you want appears on the display 
window.
 For details, see “Descrip tion of the PTY codes” (Apg. 31).
While the PTY code selected in step 2 is still on the display 
window:
3Press PTY SEARCH again.
While searching, “SEARCH” and the selected PTY code 
alternate on the display window.
The system searches 30 preset FM  stations, stops when it finds 
the one you have selected, a nd tunes in that station.
To continue searching after the first stop
Press  PTY SEARCH  again while the indications on the display 
window are flashing.
If no program is found, “NOT FOUND” appears on the display 
window. The PTY codes appears on the disp
lay window in the order of the 
table below.
Continued on next page
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Description of the PTY codes
NOTE
• Classification of the PTY codes for some FM stations may be 
different from the above list.
Switching to broadcast program of your 
choice temporarily
Another convenient RDS service is called “Enhanced Other 
Network”.
This allows the system to switch temporarily to a broadcast 
program of your choice (TA, News, and/or Info) from a different 
station except in the following cases:
 When you are listening to non-RDS stations (all AM – MW 
stations, some FM stations and other sources).
 When the system is in standby mode.
NOTE
Before you start operations; The Enhanced Other Network function is only applicable to preset 
stations.
IMPORTANT
Before using the remote control for the following 
operation; 
1 Set the remote control mode selector to 
AUDIO
.
2 Press FM/AM
.
Press TA/NEWS/INFO repeatedly until the 
program type indicator (TA/News/Info) you 
want appears on the display window.
Each time you press the button, the indicator on the display window 
changes to show the following:


 TA 
 News 
 Info 
 TA/News 
 TA/Info 
 News/Info 
 TA/News/Info 
 None 
 (back to the beginning)
TA: Traffic Announcement in your area.
News: News.
Info: Program the purpose of which is to impart advice in the 
widest sense. News: News.
Affairs: Topical program expanding or enlarging upon the 
news — debate, or analysis.
Info: Programs the purpose of which is to impart advice 
in the widest sense.
Sport: Programs concerned with any aspect of sports.
Educate: Educational programs.
Drama: All radio plays and serials.
Culture: Programs concerning any aspect of national or 
regional culture, including language, theater, etc.
Science: Programs about natural sciences and technology.
Varied: Used for mainly speech-based programs such as 
quizzes, panel games and personality interviews.
Pop M: Commercial music of current popular appeal.
Rock M: Rock music.
Easy M: Current contemporary music considered to be 
“easy-listening”.
Light M: Instrumental music, and vocal or choral works.
Classics: Performances of major orchestral works, 
symphonies, chamber music, etc.
Other M: Music not fitting into any of the other categories.
Weather: Weather reports and forecasts.
Finance: Stock Market reports, commerce, trading etc.
Children: Programs targeted at a young audience.
Social: Programs about sociology, history, geography, 
psychology and society.
Religion: Religious programs.
Phone In: Involving members of the public expressing their 
views either by phone or at a public forum.
Travel: Travel information.
Leisure: Programs about recreational activities.
Jazz: Jazz music.
Country: Songs which originate from, or continue the 
musical tradition of the American Southern States.
Nation M: Current popular music of the nation or region in 
that country’s language.
Oldies: Music from the so-called “golden age” of popular 
music.
Folk M: Music which has its roots in the musical culture of a 
particular nation.
Document: Programs concerning factual matters, presented in 
an investigative style.
TEST: Broadcasts for testing emergency broadcast 
equipment or unit.
Alarm !: Emergency announcement.
None: No program type, undefined program, or difficult to 
categorize into particular types.
Remote control
mode selector
The program type indicator
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32
To stop listening to the program selected by Enhanced 
Other Network
Press TA/NEWS/INFO repeatedly again so that the program type 
indicator (TA/News/Info) goes off from the display window. The 
system exits from Enhanced Other Network standby mode and goes 
back to the previously selected station.
When an emergency broadcast (Alarm ! signal) is sent 
from an FM station
The system automatically tunes in to the station and “Alarm !” 
appears on the display window while the system receiving the 
emergency broadcast.
Note that an emergency broadcast cannot be received in the 
following cases;
 When you are listening to non-RDS stations (all AM — MW 
stations, some FM stations and other sources).
 When the system is in standby mode.
The TEST signal is used for equipment test — whether it 
can receive the Alarm signal correctly
The TEST signal makes the system work in the same way as the 
Alarm signal does. If the TEST signal is received, the system 
automatically switches to the station broadcasting the TEST signal.
While receiving the TEST signal, “TEST” appears on the display 
window.

How the Enhanced Other Network function actually 
works
Case 1
If there is no station broadcasting the program you have 
selected
The system continues tuning in to the current station.


When a station starts broadcasting the program you have selected, 
the system automatically switches to the station. The indicator of 
received PTY code starts flashing.


When the program is over, the system goes back to the previously 
tuned station, but the Enhanced Other Network function still 
remains activated.
Case 2
If the FM station you are listening to is broadcasting the 
program you have selected
The system continues to receive the station but the indicator of 
received PTY code starts flashing.


When the program is over, the indicator of received PTY code stops 
flashing and remains lit, but the Enhanced Other Network function 
still remains activated.
NOTE
 In Enhanced Other Network standby mode, if you change the source 
to play, Enhanced Other Network standby mode is canceled 
temporarily.
If you change the source to FM again, the system returns to 
Enhanced Other Network standby mode.
 Enhanced Other Network data sent from some stations may not be 
compatible with this system.
 Enhanced Other Network does not function for some FM stations 
with RDS service.
 While listening to a program tuned in by the Enhanced Other Network 
function, the station does not change even if another network station 
starts broadcasting a program of the same Enhanced Other Network 
data.
 While listening to a program tuned in by the Enhanced Other Network 
function, you can only use 
TA/NEWS/INFO and 
RDS DISPLAY as 
the tuner operation buttons.
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							33
 Creating realistic sound fields
You can use the following surround modes to reproduce a realistic 
sound field.
Dolby Surround
Dolby Pro Logic II
Dolby Digital
DTS Digital Surround
DSP modes
DAP modes
All Channel Stereo
Dolby Surround
Dolby Pro Logic II
*
Dolby Pro Logic II has a newly developed multichannel playback 
format to decode all 2 channel sources — stereo source and Dolby 
Surround encoded source — into a 5.1 channel.
The matrix-based encoding/decoding method used by Dolby Pro 
Logic II makes no limitation for the cutoff frequency of the treble 
from surround channel and enables stereo surround sound 
compared to conventional Dolby Pro Logic.
Dolby Pro Logic II enables to reproduce spacious sound from 
original sound without adding any new sounds and tonal coloration.
Dolby Pro Logic II has two modes — Movie mode and Music 
mode:
Pro Logic II Movie (PL II MOVIE)
Suitable for reproduction of Dolby Surround encoded sources 
bearing the mark  . You can enjoy soundfield very 
close to the one created with discrete 5.1 channel sounds.
Pro Logic II Music (PL II MUSIC)
Suitable for reproduction of any 2 channel stereo music sources. 
You can enjoy wide and deep sound by using this mode.
 When Dolby Pro Logic II is activated, the 

PLII indicator 
lights on the display window.
Dolby Digital
*
Used to reproduce multichannel soundtracks of the software 
encoded with Dolby Digital ( ).
Dolby Digital 5.1 ch (DOLBY D) encoding method (so-called 
discrete multichannel digital audio format) records and digitally 
compresses the front left channel, front right channel, center 
channel, surround left channel, surround right channel and LFE 
channel signals.
Since each channel is completely independent from the other 
channel signals to avoid interference, you can obtain much better 
sound quality with much stereo and surround effects.
NOTE
 Dolby Digital software can be roughly grouped into two categories-
multichannel (up to “5.1” channel) and 2 channel software. To enjoy 
surround sounds while playing Dolby Digital 2 ch software, you can 
use Dolby Pro Logic II.
DTS Digital Surround**
Used to reproduce multichannel soundtracks of the software 
encoded with DTS Digital Surround ( ).
DTS Digital Surround (DTS) is another discrete multichannel 
digital audio format available on CD, LD and DVD software.
Compared to Dolby Digital, audio compression ratio is relatively 
low. This fact allows DTS Digital Surround format to add breadth 
and depth to the reproduced sounds. As a result, DTS Digital 
Surround features natural, solid and clear sound.
DSP modes
DAP (Digital Acoustic Processor) modes
DAP modes have been designed to create important acoustic 
surround elements.
The sound heard in a live club, dance club, hall or pavilion consists 
of direct sound and indirect sound — early reflections and 
reflections from behind. Direct sounds reach the listener directly 
without any reflection. On the other hand, indirect sounds are 
delayed by the distances of the ceiling and walls (see the diagram 
below).
These indirect sounds are important elements of the acoustic 
surround effects. The DAP mode can reproduce a realistic sound 
field by adding these indirect sounds.
The following DAP modes are provided with this system.
These DAP modes can be used to add the acoustic surround effects 
while reproducing 2 channel stereo source, and can give you a real 
“being there” feeling.
 When one of the DAP modes is selected, the DSP indicator lights 
on the display window.
LIVE CLUBGives the feeling of a live music club with a 
low ceiling.
DANCE CLUBGives a throbbing bass beat.
HALLGives clear vocal and the feeling of a concert 
hall.
PAVILIONGives the spacious feeling of a pavilion with a 
high ceiling.
*Manufactured under license from Dolby Laboratories. 
“Dolby”, “Pro Logic” and the double-D symbol are 
trademarks of Dolby Laboratories.**“DTS” and “DTS Digital Surround” are registered 
trademarks of Digital Theater Systems, Inc.
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							Creating realistic sound fields
34
Creating sound field
All Channel Stereo
All Channel Stereo (ALL CH ST.) mode can reproduce a larger 
stereo sound field using all the connected (and activated) speakers.
All Channel Stereo can be used  while reproducing 2 channel stereo 
source.
• When All Channel Stereo is sele cted, the DSP indicator lights on 
the display window.
All Channel Stereo reproduction7 Indicators on the display window
Digital signal format indicators
LPCM: Lights when Linear PCM signal comes in.
G DIGITAL: Lights when Dolby  Digital signals come in.
C : Lights when DTS Digital (Surround) signals come 
in.
No indication: No digital signa l indicator lights when analog 
signals come in.
Source signal indicators, etc.
Light to indicate the incoming signals.
a : Lights when the left channel signal comes 
in.
b : Lights when the center channel signal comes in.
c : Lights when the right channel signal comes in.
d : Lights when the LFE channel signal comes in.
g : Lights when the surround le ft channel signal comes in.
i : Lights when the surround ri ght channel signal comes in.
h : Lights when the monaural surround channel signal or 2 
channel Dolby Surround signal comes in.
f : Always lights.
The channel with “ ” shows that the corresponding speakers are 
reproducing the channels’ sound.
If the channels’ sound decoded into 5.1 channel is reproduced, only 
“ ” lights.
Normal stereo sound All Channel Stereo
Reflections from behind
Early reflections
Direct sounds
Available Surround modes for each input signal
The  B marks show available surround modes. 
* You can select these  modes by pressing SURR-MODE. (A pg. 35)
ModeSurround off
(SURR OFF) Dolby Surround
DTS Digital 
Surround (DTS) DSP mode
DAP mode ALL CH 
ST.
*SignalPL II 
MOVIE*PL II 
MUSIC*Dolby 
Digital LIVE 
CLUB*DANCE  CLUB*HALL*PAVILION*
Dolby Digital
(Multichannel)B —— B——————
Dolby Digital
(2 channel)BBB ———————
DTS Digital 
Surround
(Multichannel)B—— — B——— — —
DTS Digital 
Surround
(2 channel)BBB ———————
Analog (VCR/FM/
AM) or Linear PCMBBB ——BBB B B
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							Creating realistic sound fields
35
IMPORTANT
Before using the remote control for the following 
operation; 
 Set the remote control mode selector to AUDIO
.The system is set up to automatically select the optimal surround 
mode for input signal from digital multichannel software.
When playing back 2 channel source, you can select the desired 
surround mode manually.
On the remote control:
When playing back digital multichannel software
The appropriate multichannel surround mode is automatically 
activated.
“DOLBY D”: When a software encoded with Dolby Digital is 
played back
“DTS”: When a software encoded with DTS Digital 
Surround is played back
In these cases, you can only turn on or off (“SURR OFF”) the 
surround mode.
When playing back 2 channel source
You can select either mode of Dolby Pro Logic II (PL II MOVIE/
PL II MUSIC) or one of the DSP modes (LIVE CLUB/DANCE 
CLUB/HALL/PAVILION/ALL CH ST.).
Press SURR-MODE.
The surround mode is turned on and the current surround mode 
appears on the display window. 
Each time you press the button, the surround mode changes as 
follows;

 PL II MOVIE  PL II MUSIC  LIVE CLUB  DANCE 
CLUB 
 HALL  PAVILION  ALL CH ST.  (back to the 
beginning)
For details on each mode, see pages 33 and 34.
To turn off the surround mode
Press SURR-ON/OFF.
Each time you press the button, the surround mode turns on and off 
alternately.
SURR OFF (surround off)  current selected mode 
(surround on)
NOTE
 When selecting “PL II MUSIC”, “PL II MOVIE”, “DOLBY D” or 
“DTS” as the surround mode, the SURROUND indicator lights.
 When selecting one of the DSP modes (“LIVE CLUB”/“DANCE 
CLUB”/“HALL”/“PAVILION”/“ALL CH ST.”) as the surround 
mode, the DSP indicator lights.
 For Dolby Digital 2 channel software, you can select “PL II MUSIC” 
or “PL II MOVIE”.
Storing adjustments — auto memory
This system memorizes the surround mode settings for each source.
 When you turn the power off:
When turning the power on again, the memorized settings for the 
current source are automatically recalled.
 When you change the source:
The memorized settings for the newly selected source are 
automatically recalled.
NOTE
 If the source is FM or AM (MW), you can assign a different setting 
for each band.
Remote control
mode selector
Using the surround mode
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							Creating realistic sound fields
36
On the remote control:
1Press TEST.
Check if you can hear the sounds through all the speakers at 
the equal level.
“TEST TONE” and the corresponding signal indicator starts 
flashing on the display window, a nd the test tone comes out of 
the speakers in the following order;
]  Front left speaker ( a) ]  Center speaker ( b) ]  
Front right speaker ( c) ]  Surround right speaker 
( i ) ]  Surround left speaker ( g) ]  (back to the 
beginning)
2Adjust the speaker out put levels (–10 to 
+10).
Adjust the center speaker and surround speaker levels as much 
as the sound from the front speakers. Use one of the following 
buttons to adjust each speaker level.
 CENTER +/–  for the center speaker
 SURR-L +/–  for the surround left speaker
 SURR-R +/–  for the surround right speaker
3Press TEST again to  stop the test tone.
7For DAP modes ( Apg. 33) only
4Press EFFECT to select  the effect level 
(1 to 5) you want.
Each time you press the button, the effect level changes as 
follows;
]  DSP EFFECT 1  ] DSP EFFECT 2  ] DSP EFFECT 3 
]  DSP EFFECT 4  ] DSP EFFECT 5  ] (back to the 
beginning)
As the number increases, the se lected mode will be more 
effective. (Normally set the level to “DSP EFFECT 3”.)
NOTE
 You cannot adjust the center speaker output level for the DAP modes 
and the effect level for All Channel Stereo.
 You can output the test tone in any surround mode, or even when  surround mode is not activated.
 Speaker output levels whose source  signal indicator is lit can be 
adjusted without pressing  TEST.
 When selecting DVD as the source, you can also adjust the speaker  output levels using the choice menu. ( Apg. 53)
Adjusting the sound
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							37
Advanced operations
This section explains advanced operations for disc playback using 
the remote control.
•  shows the types of discs an operation is 
available for.
 Turn on your TV and select the  correct input mode on the TV.
NOTE
If “B” appears on the TV screen when  pressing a button, the disc 
cannot accept an operation you have tried to do or information 
required for that operation is not recorded to the disc.
You can check disc information wh ile the disc is loaded and you 
can use some functions  using the on-screen bar.
IMPORTANT
Before using the remote control for the following 
operation;
1 Set the remote control mode selector to 
AUDIO .
2Press  DV D.
 
Showing the on-screen bar
7Whenever a disc is loaded
Press ON SCREEN.
Each time you press the button, the on-screen bar changes as 
follows on the TV screen.
Example: During DVD playback
7 Contents of the on-screen bar during playback
DVD
Video CD
SVCD
CD
AShows disc type.
B Shows current transfer rate (Megabits per second).
C Shows current title (for DVD).
D Shows current chapter number (for DVD) or track number (for 
other type of discs).
E Shows time information. ( Apg. 38)
F Shows playback status.
: appears during playback.
 /  : appears during fast forward/reverse.
 /  : appears during playback in forward slow-motion/ reverse slow-motion.
: appears when paused.
: appears when stopped.
G Select this to change time information ( E). ( A pg. 38)
H Select this for Repeat Playback. ( Apg. 48)
I Select this for time search function. ( Apg. 40)
J Select this for chapter search function. ( Apg. 39)
K Select this to change a udio language or channel. ( Apg. 43, 44)
L Select this to change  subtitle language. (Apg. 43)
M Select this to change view angle. ( Apg. 42)
N Select this for Program Playback. ( Apg. 47)
O Select this for  Random Playback. ( Apg. 48)
Using the on-screen bar
Cursor
( 3 /2 // /5 )
/ENTER
OFF
(The on-screen bar disappears)
(back to the beginning)
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