Boston Acoustics GT-40 Manuale utente

GT-40

Status

Safe

4-Channel, High-Current/High-Power Ampliﬁer

GT-40_manual 4/10/03 4:17 PM Page 1

Table of Contents

Parts List 3

Features and Speciﬁcations 3

Control Functions 4

Control functions (cont.) 5

Control functions (cont.) 6

Mechanical Functions 6

Control cover removal & reinstallation 6

Multi-position mounting feet 6

Mechanical functions (cont.) 7

Ampliﬁer linking 7

Wire connection 7

Fuses 7

General Installation Precautions 8

Before you install 8

Battery & charging system 8

Wire routing 8

Installation—Ampliﬁer Mounting 9

Choose the mounting location 9

Installation—ampliﬁer mounting (cont.) 10

Passenger & trunk compartment mounting 10

Installation—Fuses & Wiring 10

Ampliﬁer fuses 10

Wire gauge 10

Installation—fuses & wiring (cont.) 11

Power/B+ & power/ground connection 11

Remote input connection 11

Speaker output connection 11

Installation—fuses & wiring (cont.) 12

Mono subwoofer operation 12

Setup Tuning—Full-range Speakers 12

Music 12

Front & rear sensitivity controls 12

Front & rear crossover controls 12

Setup tuning—full-range speakers (cont.) 13

Head unit 13

Volume 13

Front input sensitivity control 13

Front crossover controls 13

Setup tuning—full-range speakers (cont.) 14

Q-factor adjustments 14

Rear input sensitivity & crossover controls 14

Setup Tuning—Rear Fill Speakers & Subwoofers 14

Subwoofer level control 14

Rear input switch 14

Setup tuning—rear ﬁll speakers & subwoofers (cont.) 14

Head unit 15

Volume 15

Rear input sensitivity control 15

Rear crossover control 15

Phase 15

System Examples 16,17

Ampliﬁer Troubleshooting Guide 18

Contact and Warranty Information 19

GT-40_manual 4/10/03 4:17 PM Page 2

Included Hardware

(1) owner’s manual

(1) female quick-connect terminal for remote input

(1) 2mm hex wrench (for speaker input)

(1) 3mm hex wrench (for power input)

(4) mounting screws

Parts List

GT-40 Speciﬁcations

14.4VDC Power

@ 4 Ohms 4x55W

@ 2 Ohms 4x90W

@ 4 Ohms (dual-mono) 2x190W

@ 2 Ohms (dual-mono) 2x240W

12.6VDC Power

@ 4 Ohms 4x45W

@ 2 Ohms 4x70W

@ 4 Ohms (dual-mono) 2x140W

@ 2 Ohms (dual-mono) 2x190W

14.4VDC Multi-channel Power 2x55W (4 ohm), 1x240W (2 ohm)

12.6VDC Multi-channel Power 2x45W (4 ohm), 1x190W (2 ohm)

Frequency Response (-3dB) 10Hz–95kHz

Signal-to-Noise Ratio (A Weighted) >100dB

Dimensions 21/4x141/8x87/8” (57 x 358 x 225mm)

GT-40 Features

4-Channel, High-Current Ampliﬁer

2ΩBridge Stable Operation

Power Increase with Input Voltage Rise

Advanced Cooling Allows Varied Mounting Positions

Adjustable Feet for Varied Mounting Surfaces

Security Cover Protects Control Settings

Continuously Variable Crossover and Q-factor Settings

Selectable Highpass Front Channels

Selectable Mono/Stereo Rear Highpass (Rear Fill) or

Subwoofer Lowpass

Selectable Rear Channel Signal Derived from Front Channel Input

Optional Remote Bass Control

Enhanced Switching Assignments

Features and Speciﬁcations

GT-40_manual 4/10/03 4:17 PM Page 3

Control Functions

FRONT RCA Inputs

RCA cables marked “FRONT” from head unit or from other line level device

should be connected here. Use both inputs (L & R) for stereo.

FRONT Remote Input

Use the supplied FEMALE quick connector to connect the REMOTE trigger lead

from the head unit to the ampliﬁer. Ampliﬁer turns “ON” when head unit is turned

“ON.” One FEMALE .210" connector is supplied with ampliﬁer.

FRONT Input Switch

In the left position, the L & R inputs go to the FRONT L & R channels of the ampli-

ﬁer. In the right position, the L & R inputs go to the FRONT and REAR L & R chan-

nels of the ampliﬁer.

FRONT and REAR Sensitivity

Turn control clockwise to increase the ampliﬁer sensitivity to incoming signals. Turn

control counterclockwise to decrease the ampliﬁer sensitivity.

FRONT Highpass Crossover Controls

To use 12dB/octave crossover, move switch to right-hand position. Highpass

crossover frequency is adjustable from 20Hz to 350Hz by rotary control. (Moving

switch to left-hand position will bypass crossover functions.)

111

GT-40_manual 4/10/03 4:17 PM Page 4

Control Functions (cont.)

“Q” Control

“Q” Control is active when the highpass crossover is engaged and is centered

on the selected crossover point. The range of operation is 0.7–1.2.

REAR RCA Inputs

RCA cables marked “REAR” from head unit or other line level device should be

connected here. Use both inputs (L & R) for stereo.

REAR Remote Input

This remote input is parallel to the FRONT remote input and does not need to

be connected for the ampliﬁer to operate. Use either remote input to turn the

ampliﬁer on. Do not connect 12V accessories to this input.

REAR Input Switch

In the left position, the L & R inputs go to the REAR L & R channels of the ampli-

ﬁer. In the right (MONO) position, the inputs are summed. Use this setting when

the REAR channels are used with a subwoofer.

REAR Crossover Controls

To use highpass 12dB/octave crossover, move left switch to upper position. To

use lowpass 12dB/octave crossover, move left switch to lower position. Highpass

and lowpass crossover frequencies are adjustable from 50Hz to 350Hz by rotary

control. Move ﬁlter switch to “ON” position to engage.

Status LED Indicators

GREEN indicates the normal operating condition; the ampliﬁer is “ON.” GREEN

and RED together are normal when the ampliﬁer is ﬁrst turned “ON”; RED will

turn off after a few seconds. When both GREEN and RED remain on, the ampli-

ﬁer is in thermal shutdown condition. RED only indicates a fault condition, “SAFE.”

(tuned crossover frequency)

0dB

+1.6dB

-3dB

1.2.95.707

GT-40_manual 4/10/03 4:17 PM Page 5

Mechanical Functions

Recessed RCA Inputs

The input jacks are recessed into the body of the ampliﬁer to provide clear-

ance in tight mounting locations.

Control Cover Removal & Reinstallation

The cover panel is secured with two (2) captive coin-slotted screws. Coin-slotted

screws allow a coin edge to be used as a screwdriver to remove the panel.

Multi-position Mounting Feet

The mounting feet are designed to slide in both directions to clear installation

obstructions on the mounting surface.

WARNING! Before driving the mounting screws through any surface, be sure

of what is behind that surface. Check for the gas tank, brake lines, and any vehi-

cle wiring harness.

Vents (Side & Rear)

The cooling vents must be kept clear of obstructions once the ampliﬁer is installed. Failure to do this could

lead to premature thermal shutdown or ampliﬁer failure.

upper side vent lower side vent

1 inch 1 inch

Control Functions (cont.)

Subwoofer Level Control Port

Switch should be set to “OFF” when control circuit is not installed,

(see optional “subwoofer level control” owner’s manual).

cover panel

GT-40_manual 4/10/03 4:17 PM Page 6

Mechanical Functions (cont.)

Ampliﬁer Linking

The design of the side panels enables multiple ampliﬁers to be used together without additional hardware.

Wire Connection

Ampliﬁer accepts stripped wire directly into the terminal blocks. Speaker outputs accept 8-gauge, and the

DC power and ground accept 4-gauge. Tighten with supplied hex wrenches.

Fuses

Ampliﬁer accepts standard AT-style automotive blade fuses.

GT-40_manual 4/10/03 4:17 PM Page 7

Before You Install

Before you install the unit, disconnect the negative (–) battery cable in the engine compartment of the vehi-

cle. Doing so will prevent damage to both the electrical system of the vehicle and the ampliﬁer during

installation.

Wire Routing

Do not run the power wire near any low-level signals or audio cables such as the RCAs from the head

unit. (Noise can be introduced into the ampliﬁer when this occurs.) It is helpful to diagram the wire layout

ﬁrst before any installation is attempted.

Battery & Charging System

In order for the ampliﬁer to function correctly, the electrical system of the vehicle should be professional-

ly checked for overall electrical capacity. When used, the ampliﬁer will increase the demand on the battery

and alternator. Therefore both should be thoroughly evaluated before installing the ampliﬁer to ensure they

are in normal operating condition and able to handle the increased demand the ampliﬁer will present to

the vehicle’s electrical system.

General Installation Precautions

WARNING! Before driving the ampliﬁer mounting screws through any surface, be sure of what is behind

that surface. Check for the gas tank, brake lines, and any vehicle wiring harness. Never run wires outside

or under the vehicle or where they could become broken or interfere with the safe operation of the

vehicle.

GT-40_manual 4/10/03 4:17 PM Page 8

13mm (1/2”)

57mm (21/2”)

225mm (87/8”)

Choose the Mounting Location

Plan your installation so that the ampliﬁer is mounted where adequate ventilation is available.

Never mount an ampliﬁer in the engine compartment of a vehicle!

WARNING! Before driving the mounting screws through any surface, be sure of what is behind that sur-

face. Check for gas tank, brake lines, and any vehicle wiring harness.

Installation—Ampliﬁer Mounting

358mm (141/8”)

GT-40_manual 4/10/03 4:17 PM Page 9

Passenger & Trunk Compartment Mounting

If the ampliﬁer is mounted under a seat, be sure that the vents do not become

blocked. Do not allow seat padding or other obstructive material to press

down on the ampliﬁer.

All Boston GT ampliﬁers have top panel controls. If the ampliﬁer is mounted

under a seat, position the ampliﬁer so the cover panel can be removed with

the seat forward or back to allow adjustment of the audio settings.

When mounting in a trunk, choose a location that will be protected from slid-

ing cargo or other materials. Mount the ampliﬁer to solid surfaces only. Do not

mount to plastic trim panels. Do not mount the ampliﬁer with Velcro, double-

stick tape, or by wedging into position. Ampliﬁer should be mounted using

the movable mounting feet and the provided mounting screws.

Installation—Fuses & Wiring

Installation—Ampliﬁer Mounting (cont.)

Ampliﬁer Fuses

Although the ampliﬁer has internal fuses, additional fusing should be provided

at the battery on the positive (+) power wire going to the ampliﬁer. An inline

fuse should be installed at no more than 18" (46cm) on the positive (+) power

wire. The rating of the inline fuse should equal the value of the internal fuses

of the ampliﬁer if only the ampliﬁer is connected to this wire. If other devices

are connected to this wire, the fuse value should be of sufficient capacity to

handle the demand.

Wire Gauge

The ampliﬁer accepts up to 4-gauge stripped wire at the DC power and ground input terminals, and 4-gauge

is recommended. Wire runs should be kept to the minimum practical length.

GT-40_manual 4/10/03 4:17 PM Page 10

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