Boston Acoustics GT-42 Manual de usuario
GT-42
4-Channel, High-Current/High-Power Amplifier
2
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 and 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 and charging system 8
Wire routing 8
Installation—Amplifier Mounting 9
Choose the mounting location 9
Installation—amplifier mounting (cont.) 10
Passenger and trunk compartment mounting 10
Installation—Fuses and Wiring 10
Amplifier fuses 10
Wire gauge 10
Installation—fuses and wiring (cont.) 11
Power/B+ and power/ground connection 11
Remote input connection 11
Speaker output connection 11
Installation—fuses and wiring (cont.) 12
Mono subwoofer operation 12
Setup Tuning—Full-Range Speakers 12
Music 12
Front and rear sensitivity controls 12
Front and 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 and crossover controls 14
Setup Tuning—Rear Fill Speakers and Subwoofers 14
Subwoofer level control 14
Rear input switch 14
Setup tuning—rear fill speakers and subwoofers (cont.) 15
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
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)
(6) mounting screws
3
Parts List
GT-42 Specifications
14.4VDC Power
@ 4 Ohms 4x100W
@ 2 Ohms 4x150W
@ 4 Ohms (mono) 2x300W
@ 2 Ohms (mono) 2x450W
12.6VDC Power
@ 4 Ohms 4x75W
@ 2 Ohms 4x120W
@ 4 Ohms (mono) 2x250W
@ 2 Ohms (mono) 2x350W
14.4VDC Multi-channel Power 2x100W (4 ohm), 1x450W (2 ohm)
12.6VDC Multi-channel Power 2x75W (4 ohm), 1x350W (2 ohm)
Frequency Response (-3dB) 10Hz–95kHz
Signal-to-Noise Ratio (A Weighted) >100dB
Dimensions 21/4x215/8x87/8” (57 x 548 x 225mm)
GT-42 Features
4-Channel, High-Current Amplifier
2ΩBridge Stable (Mono) Operation
Power Increase with Input Voltage Rise
Advanced Cooling Allows Varied Mounting Positions
Adjustable Feet for Varied Mounting Surfaces
Security Cover Protects Control Settings
24dB or 12dB Octave Lowpass Setting
Continuously Variable Crossover and Q-factor Settings
Selectable Highpass Front Channels
Selectable Mono/Stereo Rear or Subwoofer Lowpass
Selectable Rear Channel Signal Derived from Front Channel Input
Optional Remote Subwoofer Control
Enhanced Switching Assignments
Features and Specifications
4
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.)
1
2
1
2
3
4
5
12.6–14.4VDC
B+ B+
GROUND
GND GND
LR
MONO
FRONT SPEAKER OUTPUT
MONO
REAR SPEAKER OUTPUT
LR
ON
SAFE
STATUS
2
1
HIGHPASS
OFF ON
REAR INPUT
STEREO MONO
LSUBWOOFER LEVEL
OFF ON
LOWPASS
OFF ON
LOWPASS SLOPE
REAR SPEAKER OUTPUT
5
0.2
V
INPUT SENSITIVITY 2.6
5
0.2
V
INPUT SENSITIVITY 2.6
FRONT INPUT
STEREO SEND
INPUT
REAR
20
350
Hz
200
0.7
1.2
Q/HP
0.95
50
350
Hz
200
REMOTE REMOTE SUBWOOFER LEVEL GROUND
GND GND
12.6–14.4VDC
B+ B+
FUSE 3 x 25A
LR
12dB 24dB
MONO
12dB
ST
NON PRI N TA B L E A REA
FRONT SPEAKER OUTPUT
LR
MONO MONO
3
44
5
6
129
8
7
11
10
12
5
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.
Lowpass Slope and Crossover Controls
Select appropriate crossover slope of 12 or 24dB/octave by
moving LOWPASS SLOPE switch. Lowpass crossover fre-
quencies 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.”
7
8
6
7
8
10
11
9
(tuned crossover frequency)
0dB
+1.6dB
-3dB
t
1.2.95.707
dB
Q
LOWPASS SLOPE
12dB 24dB
MONO
12dB
ST
LOWPASS
OFF ON
50
350
Hz
200
6
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 and 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 and 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 and Port
Switch should be set to “OFF” when control circuit is not installed,
(see optional “subwoofer level control” owner’s manual).
12
cover panel
7
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.
FUSE 3 x 20A
GT-42 GT-20
8
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 and 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.
9
13mm (1/2”)
548mm (215/8”)
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
GT-42
12.6–14.4VDC
B+ B+
GROUND
GND GND
LR
MONO
FRONT SPEAKER OUTPUT
MONO
REAR SPEAKER OUTPUT
LR
ON
SAFE
STATUS
57mm (21/4”)
10
Passenger and 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 and Wiring
Installation—Amplifier Mounting (cont.)
Amplifier Fuses
Although the amplifier has internal fuses, additional fusing should be pro-
vided 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 pos-
itive (+) 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.
FUSE 3 x 20A
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