Algebre

GT-42
4-Channel, High-Current/High-Power Amplifier

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Table of Contents
Parts List Features and Specifications Control Functions
Control functions (cont.) Control functions (cont.)

3 3 4
5 6

Mechanical Functions
Control cover removal and reinstallation Multi-position mounting feet Mechanical functions (cont.) Amplifier linkingWire connection Fuses

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6 6 7 7 7 7

General Installation Precautions
Before you install Battery and charging system Wire routing

8
8 8 8

Installation—Amplifier Mounting
Choose the mounting location Installation—amplifier mounting (cont.) Passenger and trunk compartment mounting

9
9 10 10

Installation—Fuses and Wiring
Amplifier fuses Wire gauge Installation—fuses and wiring(cont.) Power/B+ and power/ground connection Remote input connection Speaker output connection Installation—fuses and wiring (cont.) Mono subwoofer operation

10
10 10 11 11 11 11 12 12

Setup Tuning—Full-Range Speakers
Music Front and rear sensitivity controls Front and rear crossover controls Setup tuning—full-range speakers (cont.) Head unit Volume Front input sensitivity control Frontcrossover controls Setup tuning—full-range speakers (cont.) Q-factor adjustments Rear input sensitivity and crossover controls

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12 12 12 13 13 13 13 13 14 14 14

Setup Tuning—Rear Fill Speakers and Subwoofers
Subwoofer level control Rear input switch Setup tuning—rear fill speakers and subwoofers (cont.) Head unit Volume Rear input sensitivity control Rear crossover control Phase

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14 14 1515 15 15 15 15

System Examples Amplifier Troubleshooting Guide Contact and Warranty Information

16,17 18 19

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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 andSpecifications
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 ChannelsSelectable 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 @ 2 Ohms @ 4 Ohms (mono) @ 2 Ohms (mono) 12.6VDC Power @ 4 Ohms @ 2 Ohms @ 4 Ohms (mono) @ 2 Ohms (mono) 14.4VDC Multi-channel Power 12.6VDC Multi-channel Power Frequency Response(-3dB) Signal-to-Noise Ratio (A Weighted) Dimensions 4x100W 4x150W 2x300W 2x450W

4x75W 4x120W 2x250W 2x350W 2x100W (4 ohm), 1x450W (2 ohm) 2x75W (4 ohm), 1x350W (2 ohm) 10Hz–95kHz >100dB 21/4x215/8x8 7/8” (57 x 548 x 225mm)

3

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Control Functions

3
STEREO FRONT INPUT SEND I N P UT REAR OFF

5
ON HIGHPASS STEREO

9
MONO L OFF REAR INPUT

12
ON SU B WO O FER LEVEL

10
OFF LOWPA SS SLO PE 12dB 12dB 24dB MONO ST LOWPASS ON FUSE 3 x 2 5 A

350 200
Hz

20 0.2
I N P U T S E N S I T I VI TY

6
1.2 0 .9 5
Q/HP

350 200
Hz

50
MONO MONO R L R B+ B+ GND GND

0.2
INPUT SENSITIVITY

L

2 .6

V

2.6

V

5
REMOTE

0 .7
REMOTE SUBWOOFER LEVEL

5
FRONT SPEAKER OUTPUT REAR SPEAKER OUTPUT1 2 . 6 – 1 4 . 4 VDC GROUND

4

4

N O N P R I N TA B L E A R E A

1

11 2
S TAT U S
ON SAFE

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MONO FRO N T SPEA K ER O U TPU T MONO R EA R SPEA K ER O U TPU T B+ L R L R B+ GND GND 12.6–14.4VDC G RO U N D

12 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.

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