GT-42
4-Channel, High-Current/High-Power Amplifier
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 |
2
Parts List
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
Features and Specifications
GT-42 Features
4-Channel, High-Current Amplifier
2Ω Bridge 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
GT-42 Specifications
14.4VDC Power
@ 4 Ohms |
4x100W |
@ 2 Ohms |
4x150W |
@ 4 Ohms (mono) |
2x300W |
@ 2 Ohms (mono) |
2x450W |
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12.6VDC Power |
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@ 4 Ohms |
4x75W |
@ 2 Ohms |
4x120W |
@ 4 Ohms (mono) |
2x250W |
@ 2 Ohms (mono) |
2x350W |
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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) |
3
Control Functions
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3 |
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5 |
9 |
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12 |
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10 |
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STEREO |
SEND |
OFF |
ON |
STEREO |
MONO |
OFF |
ON |
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OFF |
ON |
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INPUT |
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REAR |
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HIGHPASS |
REAR INPUT |
L |
SUBWOOFER LEVEL |
LOWPASS SLOPE |
LOWPASS |
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FRONT INPUT |
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3 5 0 |
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12dB 12dB 24dB |
3 5 0 |
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ST |
MONO |
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2 0 0 |
Hz |
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2 0 0 |
Hz |
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2 0 |
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5 0 |
MONO |
MONO |
0 . 2 |
1 . 2 |
0 . 2 |
L |
R |
L |
R |
INPUT SENSITIVITY 2 . 6 |
V |
0 . 9 5 |
Q/HP |
INPUT SENSITIVITY 2 . 6 |
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V |
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5 |
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0 . 7 |
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5 |
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REMOTE |
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REMOTE SUBWOOFER LEVEL |
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FRONT SPEAKER OUTPUT |
REAR SPEAKER OUTPUT |
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4 |
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4 |
N O N P R I N TA B L E A R E A |
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FUSE 3 x 25A
B+ |
B+ |
GND |
GND |
12 . 6 – 14 . 4VDC |
GROUND |
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11 |
7 |
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2 |
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S TAT U S |
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M O N O |
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MONO |
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12 |
FRONT SPEAKER OUTPUT |
REAR SPEAKER OUTPUT |
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ON |
L |
R |
L |
R |
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SAFE |
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8
1 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.
2 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.
3 FRONT Input Switch
In the left position, the L & R inputs go to the FRONT L & R channels of the amplifier. In the right position, the L & R inputs go to the FRONT and REAR L & R channels of the amplifier.
4 FRONT and REAR Sensitivity
Turn control clockwise to increase the amplifier sensitivity to incoming signals. Turn control counterclockwise to decrease the amplifier sensitivity.
5 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 . 6 – 1 4 . 4 V D C |
G RO U N D |
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B + |
B + |
G N D |
G N D |
1
2
4
Control Functions (cont.)
6 “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.
dB
Q
+1.6dB
0dB
-3dB
.707 .95 1.2
t (tuned crossover frequency)
7 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.
8 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.
9 REAR Input Switch
In the left position, the L & R inputs go to the REAR L & R channels of the amplifier. In the right (MONO) position, the inputs are summed. Use this setting when the REAR channels are used with a subwoofer.
10 Lowpass Slope and Crossover Controls
Select appropriate crossover slope of 12 or 24dB/octave by
moving LOWPASS SLOPE switch. Lowpass crossover fre- |
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LOWPASS SLOPE |
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quencies are adjustable from 50Hz to 350Hz by rotary control. |
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12dB 12dB 24dB |
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Move filter switch to “ON” position to engage. |
ST MONO |
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11 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 amplifier is in thermal shutdown condition. RED only indicates a fault condition, “SAFE.”
7
8
OFF ON
LOWPASS
350
200 |
Hz |
50
5
Control Functions (cont.)
12 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).
cover panel
Mechanical Functions
Recessed RCA Inputs
The input jacks are recessed into the body of the amplifier to provide clearance in tight mounting locations.
1 inch
1 inch
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 vehicle 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
6
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