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Summary of Contents for Boston Acoustics GT-42
- Page 1 GT-42 4-Channel, High-Current/High-Power Amplifier...
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Page 2: Table Of Contents
Table of Contents Parts List Features and Specifications Control Functions Control functions (cont.) Control functions (cont.) Mechanical Functions Control cover removal and reinstallation Multi-position mounting feet Mechanical functions (cont.) Amplifier linking Wire connection Fuses General Installation Precautions Before you install Battery and charging system Wire routing Installation—Amplifier Mounting... -
Page 3: Parts List
(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... -
Page 4: Control Functions
Control Functions STEREO S END STEREO M O N O O FF I NP UT RE AR FRONT INPUT HIGHPASS REAR INPUT SU B WO O FER L EVEL 3 50 2 0 0 0 . 2 1 . 2 I NP UT SE NS I T I VI TY 2 . -
Page 5: Control Functions (Cont.)
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. -
Page 6: Control Functions (Cont.)
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). cover panel Mechanical Functions Recessed RCA Inputs The input jacks are recessed into the body of the amplifier to provide clear- ance in tight mounting locations. -
Page 7: Mechanical Functions (Cont.)
Mechanical Functions (cont.) Amplifier Linking The design of the side panels enables multiple amplifiers to be used together without additional hardware. GT-42 GT-20 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. -
Page 8: General Installation Precautions
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. -
Page 9: Installation-Amplifier Mounting
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. S TATUS S A F E GT-42 M O N O MONO F RONT S P E AKE R OUT P UT... -
Page 10: Installation-Amplifier Mounting (Cont.)
Installation—Amplifier Mounting (cont.) 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. -
Page 11: Installation-Fuses And Wiring (Cont.)
Installation—Fuses and Wiring (cont.) Power/B+ and Power/GND Connection Strip approximately " (16mm) of insulation. The positive (+) power wire is installed into the amplifier terminal marked “B+.” The negative (–) wire is installed into the terminal marked “GND.” The ground wire should be as short as possible and connected directly to the chassis of the vehicle. -
Page 12: Installation-Fuses And Wiring (Cont.)
Installation—Fuses and Wiring (cont.) Mono Subwoofer Operation If the amplifier is to be bridged and used with a subwoofer connected to the REAR channels, use the “SPEAKER OUTPUT” terminals marked for mono use. WARNING! Subwoofer impedance must not fall below 2 ohms when in MONO mode. Setup Tuning—Full-Range Speakers 1) Music The material chosen for head unit/amplifier system setup must be both clear in recording quality and dynam-... -
Page 13: Setup Tuning-Full-Range Speakers (Cont.)
Setup Tuning—Full-Range Speakers (cont.) 4) Head Unit The head unit should have all controls such as bass, treble, balance, and fader set to the flat or centered position. The volume control should be at the minimum setting. If the head unit has any equalization or bass management features such as boost, they should be defeated at this time. -
Page 14: Setup Tuning-Full-Range Speakers (Cont.)
Setup Tuning—Full-Range Speakers (cont.) 8) FRONT “Q” Control Once the FRONT highpass crossover point has been determined, use the FRONT “Q” control to increase the bass information centered around the crossover point. Setting the front “Q” control is done in conjunction with setting the levels on the input sensitivity and highpass crossover frequency controls. -
Page 15: Setup Tuning-Rear Fill Speakers And Subwoofers (Cont.)
Setup Tuning—Subwoofers (cont.) 3) Head Unit The head unit should have all controls such as bass, treble, balance, and fader set to the flat or centered position. The volume control should be at the minimum setting. If the head unit has any equalization or bass management features such as boost, they should be deactivated at this time. -
Page 16: System Examples
System Examples System A—Full-Range Front with Full-Range Rear System B—Full-Range Front with Rear Fill to ground to ground fuse battery terminal fuse battery terminal to ground to ground fuse battery terminal fuse battery terminal... -
Page 17: System Examples
System Examples (cont.) System C—Main Speakers with Single Subwoofer (2Ω) System D —Main Speakers with Parallel 4Ω Subwoofers (2Ω load) 6.5LF to ground to ground fuse battery terminal fuse battery terminal 2Ω 10.5LF to ground to ground fuse battery terminal fuse battery terminal 6.5LF... -
Page 18: Amplifier Troubleshooting Guide
Amplifier Troubleshooting Guide Status LEDs on Amplifier not Lit Verify Remote turn-on wire from source to amplifier has proper voltage Power (B+) connections at amplifier, terminal blocks, and battery are secure Ground (GND) connections at amplifier and vehicle chassis are secure Battery B+ fuse is OK Amplifier fuse is OK B+ at battery and B+ at amplifier have proper voltage... -
Page 19: Contact And Warranty Information
Limited Warranty (US) For one (1) year from the date of purchase, Boston Acoustics will repair for the original owner any defect in materials or workmanship that occurs in normal use, without charge for parts and labor—when purchased from an authorized Boston Acoustics retailer.
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