Adcom GTP-760 User Manual

GTP-760

Digital Processing

Tuner / Preamplifier

OWNER’S MANUAL

This page should be picked up from any Adcom manual second page (inside front cover)

SAFETY NOTIFICATION PAGE

This equipment generates and uses radio frequency energy and if not installed and used properly (that is, in strict accordance with the manufacturer’s instructions), may cause interference to radio and television reception. It has been type tested and found to comply with the specifications Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference in a residential installation.

Howe ver , there is no guarantee that interf erence will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures.

• Reorient the receiving antenna

• Relocate the processor with respect to the receiver

• Move the processor away from the receiver

• Plug the processor into a different outlet so that the processor and receiver are on different branch circuits.

If necessary , the user should consult the dealer or an e xperienced radio/television technician for additional suggestions. The user may find the follo wing booklet prepared by the Federal Communications Commission helpful: “How to identify and Resolve RadioTV Interference Problems”. This booklet is availab le from the US Gov ernment Printing Office, W ashington, DC, 20402, Stoc k No. 004-000-00345-4.

Caution — To prev ent electrical shock, do not use the polarized plug with an e xtension cord or receptacle, or

other outlet, unless the blades can be fully inserted to prevent b lade e xposure.

Attention—

prise de courant ou une autre sortie de courant, sauf si les lames peuvente être insérées à fond sans laisser aucune partie a décourvert.

Pour prév enir les chocs électriques ne pas utiliser cette fiche polarisée avec un prolongateur, une

Explanation of Graphic Symbols

This “Lightning Flash with Arrowhead” symbol is intended to alert the user of the presence of uninsulated “dangerous voltage” within the product’ s enclosure that ma y be of sufficient magnitude to constitute a risk of electric shock to persons.

The “Exclamation Point” symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

A NOTE FROM ADCOM

Thank you and congratulations on y our purchase of the ADCOM GTP-760 Digital Processing Tuner/Preamplifier. The GTP-760 forms the centerpiece of a truly leading edge home theater system. To deliver the highest possible performance, ADCOM designers and engineers utilized the most advanced digital signal processing “engines” av ailable , the Motorola 56000 series. The GTP-760 actually uses three processors in combination, two 56009’ s and one 56007, for full 24-bit Dolby Digital and DTS decoding with digital bass management. In addition, we chose high precision six channel 20-bit Digital-to-Analog converters and all Class A analog output circuits for the finest possible sound.

ADCOM PROTECTION PLAN (USA ONLY)

ADCOM offers the enclosed valuab le Limited Warr anty . Please read the details on the W arranty Card carefully to understand the extent of the protection offered b y the W arr anty, its reasonable limitations, and what you should do in order to obtain its benefits. Be sure to verify that the serial number printed on the rear panel matches the serial number on the outer carton. If any number is altered or missing, y ou should notify us immediately in order to ensure that you have received a genuine ADCOM product which has not been opened, mishandled, or tampered with in any fashion.

CONCEALED SHIPPING DAMAGE

Before your new GTP-760 left our factory, it was carefully inspected for physical imperfections and tested for all mechanical and electrical parameters as a routine part of ADCOM’s systematic quality control program. This should ensure a flawless product in both appearance and performance. After you have unpacked the GTP-760, inspect it for ph ysical damage. Save the shipping carton and all packing material as they are intended to reduce the possibility of transportation damage should your component ev er need to be shipped or moved again.

In the unlikely event that damage has occurred, notify your dealer immediately and request the name of the freight carrier so a written claim to cover shipping damages can be filed. THE RIGHT TO A CLAIM A GAINST A PUBLIC CARRIER CAN BE FORFEITED IF THE CARRIER IS NO T NO TIFIED PROMPTLY, IN WRITING, AND IF THE SHIPPING CAR T ON AND PACKING MATERIALS ARE NOT AV AILABLE FOR INSPECTION BY THE CARRIER. SAVE ALL P A CKING MATERIALS UNTIL THE CLAIM HAS BEEN SETTLED.

This unit is manufactured under license from Dolby Laboratories Licensing Corporation. It is additionally licensed under one or more of the following patents: U .S. number 3,959,950, Canadian numbers 1,004,603 and 1,037,877.

Dolby(r) Pro Logic(r), and Dolby Digital(r) are registered trademarks of Dolby Laboratories Licensing Corporation.

Manufactured under license from Digital Theater Systems, Inc. US Patent Number US Pat. No . 5,451,942 and other world-wide patents issued and pending. “DTS”, “dts”, “DTS Digital Surround”, are trademarks of Digital Theater Systems, Inc. (Copyright 1996 Digital Theater Systems, Inc. All Rights Reserved.

Table of Contents

PRELIMINARY INFORMATION.....................................................................p. 2

Safety Information A Note from ADCOM The ADCOM Protection Plan Unpacking your GTP-760

1.0 PRODUCT FEATURES..........................................................................p. 6

1.1 Front Panel Controls

Headphone jack Po wer button and LED Surround mode button and LED indicators Dialog Enhance button Dynamic Range button and LED indicators Display Window T uner preset b uttons Shift (8-14) button FM/AM button Seek/Manual button T uning Down/Up b uttons Panel Dim b utton Audio Mute button

5.1 Channel In button Input Selector buttons and LED indicators Master V olume control IR (infrared) sensor Room 2 button

1.2 Rear Panel Inputs & Outputs — System Connections.........................p. 8

Composite or S-Video? RCA jack color key Antenna connections Digital audio/standard (composite) video inputs

DVD Digital 2

Digital 1 (RF) Dig.1 RF demodulator switch 12 volt trigger output Analog audio/standard (composite) video inputs and outputs

LD (laserdisc) inputs

VCR inputs and outputs

Video aux. inputs

Room 2 outputs

Video Processor inputs and outputs

Tape inputs and outputs

Video monitor outputs

CD inputs S-Video inputs and outputs

D VD inputs

Digital 2 inputs

Digital 1 input ( RF )

LD input VCR input and output Video aux input Room 2 output Video monitor outputs

Video Processor input and output Video Processor On/Off switch Remote control connections

Infrared repeater outputs

Remote sensor extension outputs Preamplifier outputs

5.1 Channel inputs AC fuse holder AC power cord AC convenience outlet

1.3 The Remote Control..................................................................................p. 19

2.0 INSTALLING/CONNECTING THE GTP-760.............................................p. 28

2.1 Physical Placement

2.2 Connecting Source Components to the GTP-760

3.0 INITIAL SETUP...............................................................................................p. 29

3.1 The On Screen Display

3.2 CHANNEL DELAY

3.3 SPEAKER SIZE

3.4 CHANNEL BALANCE

3.5 INPUT SETTINGS

4.0 BASIC OPERATION......................................................................................p. 34

4.1 Surround Modes

4.2 Tuner

4.3 Room 2

5.0 TROUBLE SHOOTING.................................................................................p. 38

6.0 CARE, MAINTENANCE, and SERVICE...................................................p. 40

7.0 SPECIFICATIONS........................................................................................p. 41

1.0 PRODUCT FEATURES

1.1 Front Panel Controls

The GTP-760’s front panel is a model of simplicity. All controls are logically grouped for easy , intuitive operation. F amiliarize y ourself with the follo wing diagram and read the short explanations of each feature. When you finish, y ou will be well on y our w a y to enjo ying the GTP-760’ s convenience and sound quality .

33 7 6 8 14 15

DIGITAL

GTP-760

phones

DTS Dolby Digital Cinema Dolby Pro Logic symphony hall stadium jazz club 5-chan. stereo 2-chan. stereo

full 75% 50% 25%

DIGITAL

SURROUND

surround mode

dialog enhance

dynamic range

DVD digital 1 digital 2

RDS PROGRAM TYPE AM FM STEREO SEEK VOLUME MUTE PRESET

1234567shift (8-14) LD VCR video aux

FM/AM seek/manual < tuning > dim 5.1-channel in CD tape tuner room 2

1 2 5 4 9 10 11 12 13 14 16 17

1 Headphone Jack: This accepts the stereo 1/4" phone plug connector used by almost all high

quality headphones. When y ou use the headphone jack, the GTP-760’ s rear panel main line lev el Preamp outputs are muted. Room 2 outputs are NO T aff ected.

2 Po wer Button and LED: Use this button to turn your GTP-760 ON and OFF. When y ou first

push the Po wer Button to the ON (depressed) position, the center LED will glo w yellow until all circuitry stabilizes. When y our GTP-760 is ready to use, the LED will turn red.

NOTE:

panel Po wer Button is not depressed, the remote control will not ha ve an y eff ect. When the front panel Po wer Button is engaged, the remote controller’ s “P o wer” button will cycle your GTP-760 between standby and operation modes. When in standby mode (indicated b y the yellow LED), y ou need to press the remote control’ s “Power” button to activ ate your GTP-760’s circuitry (the LED will turn red when you do this).

The front panel Power Button must be engaged to use the remote control. If the front

3 Surround Mode Button and LED Indicators: Pushing the button sequentially steps your

GTP-760 through all the availab le operating modes for the selected input. The modes that are not available for the current operating state are automatically bypassed.

For the 6 analog inputs, the choices are always the same -

Cinema, symphony hall, stadium, jazz club, 5-chan. stereo

Dolby Pro Logic, Dolby Pro Logic/

, and

2-chan. stereo

For digital inputs (D V D , digital 1 and digital 2) the choices are dynamic and depend on the type of signal being input.

For DTS signals, the choices are For Dolby Digital 5.1 channel signals, the choices are

Dolby Digital/2 chan. stereo

DTS, DTS/Cinema

and

DTS/2 chan. stereo

Dolby Digital, Dolby Digital/Cinema

and

For familiar music CDs (also called PCM signals) the choices are the same as for analog inputs,

stereo

option is not available and the GTP-760 automatically bypasses that choice.

4 Dialog Enhance Button: A shelving filter with a corner frequency of 7 kHz that reduces the

often excessive high frequencies on some movie soundtracks that make them fatiguing to listen to. It also provides a boost in the midrange output for center and front channel speak ers.

5 Dynamic Range Button and LED Indicators: This button, usable only with a Dolb y Digital

source, incrementally reduces the audio track’s dynamic range in four steps (full, 75%, 50%, and 25%) to allow comfortable listening under a wide variety of conditions. The normal, or default, position is full.

Although we usually prefer to reproduce a source’ s full dynamic range (the diff erence between very loud and very soft sounds), we occasionally need to reduce dynamics. For example, when playing a movie late at night, loud explosions might wake sleeping family members. Simply turning the volume control down would probably make a whisper in the next scene inaudible. The Dynamic Range button solves this dilemma b y progressively lo wering the volume of loud peaks while increasing the le v el of softer sounds . This allo ws y ou to hear every element of the soundtrack without disturbing those around you or forcing you to strain to hear delicate nuances.

6 Display Window: This shows all the pertinent information you will need to effectively use the

GTP-760 on a daily basis. W e carefully designed this window to displa y only the data y ou need at the time you need it. The window’ s configuration will change as y ou ask the GTP-760 to do different things. The displa y normally shows the input y ou’ve selected. If you’re currently listening to AM or FM radio, the displa y sho ws that signal’s frequency . Additional information appears as needed and we’ll note these appearances in subsequent sections of this manual.

Dolby Pro Logic, Dolby Pro Logic/Cinema, symphony hall, stadium, jazz club, 5-chan.

, and

2-chan. stereo

. Because CDs do not carry Dolby Digital signals , the

Dolby Digital

7 T uner Preset Buttons: These buttons allow quic k access to up to 14 preselected AM or FM

broadcast frequencies. To save presets, tune to the desired station and press one of these 7 buttons. Continue to hold the button until it lights and the display shows the preset n umber . Use the Shift button in conjunction with these buttons to select and save presets 8-14.

8 Shift (8-14) Button: This allows each of the 7 tuner preset buttons to do “double duty. ” When

the LED in the center of the shift button is illuminated red, the 7 tuner preset buttons activate tuner presets 8-14. When the LED in the center of the shift b utton is not illuminated, the 7 tuner preset buttons activate tuner presets 1-7.

9 FM/AM Button: As you might expect, this button selects AM or FM. In addition to the

selected broadcast frequency, a small “AM” or “FM” indicator appears in the bottom of the Display Window to confirm your choice.

1 0 Seek/Manual Button: This controls the tuner’ s scan function and working of the tuning b uttons.

In SEEK - goes UP to the next available station. In MANUAL - mo v es UP in increments to the desired frequency y ou select manually.

1 1 T uning Do wn/Up Buttons: These allo w easy selection of all the stations your GTP-760 can

receive. Remember that these Tuning buttons will scan to the next activ e or to the adjacent frequency depending on how you’ve set the Seek/Manual button described above.

1 2 Dim Button: This reduces Displa y window brightness for listening or vie wing in a dark

room. The b utton simply switches betw een full and reduced illumination.

1 3 5.1 Channel In Button: This b utton selects the 5.1 channel analog input, which allows the user

to enjoy high-resolution, multichannel f ormats such as D VD-Audio and Super A udio CD. This pure analog input completely bypasses any digital conversion or processing to maintain the highest possible audio quality; thus, delay and bass management are disabled and no surround modes may be selected when using the 5.1 channel analog input. This input is selectable from the front panel only.

1 4 Input Selector Buttons and LED indicators: These allow easy choice of any av ailable input.

When you select a particular input, the LED in the center of that button will light and the input name will appear in the Display window to confirm your choice. Choosing an input automatically selects the Surround mode last used with that input. You may change the Surround mode at any time by using the Surround Mode button (#3 above).

1 5 Master V olume Control: This rotary knob adjusts the volume f or all activ e speakers sim ulta-

neously. While it has the accustomed look and feel of the familiar analog volume control, it’s internal implementation is digital. The distinction will be apparent only in that the knob will NORMALLY be positioned near 12 o’clock for typical listening lev e ls. This will be true f or all sources.

1 6 IR (infrared) Sensor: This small window receiv es commands from the remote controller . Do

not block this window with accessories, cables, CD jewelboxes, etc., or the remote control

will not work.

1 7 Room 2 Button: Pressing this button will activate the Room 2 output circuitry , enabling an y of

six analog audio and video sources; LD, VCR, video aux, CD , tape, and tuner . Pressing the Room 2 button a second time will cause the LED’ s on the available source buttons to il luminate. The source that is currently selected for Room 2 will be flashing. Choose the source you want to send to Room 2 by pressing the desired source button, it will illuminate steadily and the others will go off. Pressing and holding Room 2 for several seconds will turn the Room 2 output OFF.

1.2 Rear Panel Inputs & Outputs — System Connections

Like the front panel, the GTP-760’ s rear panel is carefully arranged to mak e hookup, configuration, and use as simple as possible. How e ver , the GTP-760’ s e xtraordinary capabilities take some study to use most effectively. We strongly suggest that you read this section of the manual before beginning to hook up your system. You will sav e y ourself much time and effort if you carefully think out what you expect from your system: consider the components you will use, where the y’ll be placed, and how you will w ant them to work together .

The diagrams and notes in this section will probably answer most of your questions about interfacing the GTP-760 with other components in your system. You will find more detailed information on initial setup and configuration in following sections of the manual.

Note that the GTP-760’s RCA-style jac ks hav e color-coded centers to mak e connections easier. Use this key to help route cables properly:

YELLOW centers = VIDEO inputs (composite) BLACK centers = DIGITAL A UDIO inputs

CENTER CHANNEL and SUBWOOFER

PREAMP inputs and outputs WHITE centers = LEFT CHANNEL ANALOG AUDIO inputs RED centers = RIGHT CHANNEL ANALOG AUDIO inputs

and

Composite or S-Video?

One of the first system hook-up decisions to make will be which video format to use. While the composite video format is more widely used, S-Video can offer improv ed picture quality. The GTP-760 does not convert between the two f ormats. Howev er, it can save the video mode for each input. It is recommended that only one video format be used as this simplifies normal operation. How e ver , setup f or using both formats is also described below. The GTP-760 is shipped from the factory ready for composite video sources and display devices.

For Composite Video Onl y: If y our tele vision has only composite video inputs (usually a y ellow colored RCA style connector) or you elect to use only composite video connections in your system, then the GTP-760 is already properly set. Connect a video cable from one of the two yellow “standard monitor” video jacks on the back of the GTP-760 to the video input of y our tele vision. Turn on the GTP-760 and television and verify a blue colored screen. If you are unable to get the blue screen, consult your television owner’ s manual to determine how to select the appropriate television input. If y ou are certain your television is in the correct mode, follow directions 1 through 3 below (S-Video only). Repeat that procedure until the GTP-760 display reads COMPOSITE at the completion of step 3.

For S-Video Only: If your television has an S-Video input and all of your video source components have S-Video outputs, then you will probably elect to use only S-Video connections in you home theater system. The following steps will switch the GTP-760 to S-Video operation.

1) Turn the GTP-760 off via the front panel power switch.

2) On the front panel, hold the surround mode button down and power the unit ON.

3) Continue to hold the surround mode button until the front panel displa y of the GTP-760 reads S-VIDEO . The GTP-760 is now set for S-VIDEO operation. (Note: Repeating the procedure returns the unit to

composite mode and COMPOSITE shows in the display). Connect an S-Video cable from one of the two “S-video monitor” jac ks on the back of the GTP-760 to the S-Video input of y our tele vision. Turn on the GTP-760 and television and verify a light gray colored screen. If you are unable to get the gray screen, consult your television owner’ s man ual to determine how to select the appropriate television input.

For using both Composite and S-Video: While more difficult to do , y ou ma y elect to use both video modes, if some of your video sources have composite video only and others have S-Video capability. This connection also requires that your television accepts both formats. A common scenario would be connecting both a VCR that has composite video only and a DVD player that has S-Video capabilities to your GTP-760. The GTP-760 will not con v ert between the different video types, but will remember the video mode for each of its inputs. Thus , when y ou select VCR, the GTP-760 switches to composite video mode. When y ou select DVD , the GTP-760 switches to S-Video mode . Consequently, to operate your system in this way connect BOTH a composite video cable from one of the “standard monitor” jac ks on the back of the GTP-760 to the composite input on your television AND an S-Video cable from one of the “S-Video monitor” jacks on the back of the GTP-760 to the S-Video input of your television. (Note, in this example, the GTP-760 s witches modes automatically, but you will still need to manually change the mode of your television an ytime you s witch between these inputs). Turn on the GTP-760 and television and verify a blue colored screen. If you are unable to get the b lue screen, consult y our tele vision o wner’s manual to determine how to select and use the television’ s video inputs . All of the GTP-760 inputs are initially set for composite mode. Consult section 3.5 INPUT SETTINGS discussion of the VIDEO field to use the GTP-760 on screen display to save the S-Video mode settings for your S-Video sources.

18 Antenna connections 19 Digital audio/standard (composite) video inputs

DVD Digital 2

Digital 1 ( RF ) 20 Digital 1 RF Demodulator switch 2 1 12 volt trigger output 22 Analog audio/standard

(composite) video inputs and outputs

LD (laserdisc) inputs

VCR inputs and outputs

Video aux in

Room 2 outputs

Video Processor inputs and outputs

Tape inputs and outputs

Standard (composite) video monitor outputs

CD inputs 2 3 S-Video inputs and outputs

D VD input

Digital 2 input

Digital 1 input (RF) LD input VCR input VCR output Video aux input Room 2 output S-Video monitor outputs

Video Processor input and output 2 4 Video Processor On/Off switch 25 Remote control connections

Infrared repeater outputs

Remote sensor extension outputs 26 Preamplifier outputs 2 7 5.1 inputs 2 8 AC power cord and AC fuse holder 2 9 AC convenience outlets

1 8 Antenna Connections: You need to connect different antennas for FM and AM reception.

For FM, use either the 75 ohm “F” connector or the 300 ohm “push terminals” depending on what type of antenna you’ve chosen. If you’re getting FM from a cable system feed, you will most likely use the “F” connector . The “T” shaped antenna supplied with the GTP-760 uses the push terminals marked “300 ohms.” “T” antennas are directional. They should be placed as high as possible with the arms fully extended. If possible, the arms should be oriented so that they are at right angles to the transmitter .

signal direction

transmitter

best reception

FM antenna

poor reception

to GTP-760 FM antenna connection

The supplied AM loop antenna connects to the push terminals marked “ground” and “AM,” respectively. You may need to adjust the position of the antenna for best reception. If you use an outdoor AM antenna, follow the manuf acturer’ s instructions.

19 Digital Audio/Standard (Composite) Video Inputs

Remember that you must choose either standard (composite) or S-Video connections before hooking up source components. This section of the manual assumes you have chosen composite connections. S-Video connections will be handled in a subsequent section.

signal direction

transmitter

DVD in: Connect the DVD player’s composite video output to the y ellow-center RCA jac k immediately under the “D VD in” label.

Connect the D VD play er’ s RCA-style digital output jac k to the GTP-760’ s b lack-center RCA jack located under the “D VD in” label.

Note:

If your DVD player has only a TOSlink (optical) digital output, you ma y need to connect it

to “dig.2 in.” If this is the case, remember to connect the player’s video output (composite or S-

DVD

in in in

digital 2 digital 1

12V

trigger out

DVD

in in in

digital 2 digital 1

Standard

video

dig1RF

demodulator

in out

Video) to the appropriate “dig.2 in” jack.

Digital 2 in: This input is recommended f or an audio/video source (DSS receiv er , etc.) with a

TOSlink (optical) digital output. Remember that the composite video connection will go to the yellow-center RCA jack

immediately under the “dig.2 in” label. Connect the source’s T OSlink (optical) digital output to the GTP-760’s TOSlink sock et located

under the “dig.2 in” label.

Digital 1 in (RF): W e recommend this input for laserdisc pla y ers with a digital RF output.

It is the only input on the GTP-760 equipped with the RF demodulator needed to process a laserdisc’s Dolb y Digital encoded soundtrac k.

Connections follow the same pattern detailed in “DVD in” and “Dig.2 in” above . Connect the laserdisc play er’ s composite video output to the yellow-center RCA jac k immediately under the “dig.1” label. Then connect the pla y er’s coaxial digital output to the black-center RCA jack under the “dig.1 in” label.

20 Digital 1 RF Demodulator (bypass) Switch

(see illustration on preceding page) This switch adds flexibility to the GTP-760. If you play laserdiscs with Dolby Digital-encoded

soundtracks, put this switch in the IN position. This places the demodulator circuit in the signal path and allows proper Dolby Digital decoding.

If you do not have a laserdisc player with a digital RF output, place the switch in the OUT position. You can then use this input in exactly the same way as you would use the DVD input.

2 1 12 V olt T rigger Output

(see illustration on preceding page) To facilitate remote turn-on and turn-off of other components (power amplifiers, for e xample),

this 2.5 mm mini-jack provides a constant signal (12 volts DC) whenever the GTP-760 is fully powered. When the GTP-760 is turned off (via the front panel switch) or placed in standby mode (via the “power” button on the remote control), the jack has no output.

2 2 Analog Audio and Standard (Composite) Video Inputs and Outputs

Standard

video

LD (laserdisc) Inputs:

Use these inputs as you have already used the digital source inputs (see #19 above.) After selecting and connecting the laserdisc player’ s composite video output to the GTP-760’s yellow-center RCA jac k immediately under the “LD in” label, connect the pla yer’ s left channel analog audio output to the white RCA jack under the “LD in” label. Then connect the pla yer’ s right channel analog audio output to the “LD in” red RCA jack.

VCR Inputs and Outputs:

Because you will use your VCR to record as well as play, take care to follow these instructions carefully.

VCR

in out

video auxinroom2

out

outinoutinin

tape

CDoutin

1) Connect the VCR’s composite video output to the GTP-760’s y ellow-center RCA jac k immediately under the “VCR in” label.

2) Connect the VCR’s composite video input to the GTP-760’s yellow-center RCA jac k immediately under the “VCR out” label.

3) Connect the VCR’s left channel analog audio output to the GTP-760’s white “VCR in” jack.

4) Connect the VCR’s right channel analog audio output to the red “VCR in” jack.

5) Connect the VCR’s left channel analog audio input to the GTP-760’s white “VCR out” jack.

6) Connect the VCR’s right channel analog audio input to the red “VCR out” jack.

Note: You may want to use so-called “A/V combination” patch cords to make this step less confusing. Sold under a variety of names, these combination cables usually include a video conductor and two audio conductors in one cable assembly. If y ou elect to use them, make sure that they support the video format (composite or S-Video) you’ve chosen f or y our system.

+ 30 hidden pages

Adcom GTP-760 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual