Boston Acoustics GT-42 Manual 

Text of Boston Acoustics GT-42 User Guide:

• 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 s

• Boston Acoustics GT-42, 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-42Specifications 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

• Boston Acoustics GT-42, 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

• 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 par

• Boston Acoustics GT-42, 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

• Boston Acoustics GT-42, 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

• Boston Acoustics GT-42, 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 fo

• Boston Acoustics GT-42, 9 13mm ( 1 /2”) 548mm (21 5 /8”) 225mm (8 7 /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 L R MONO FRONT SPEAKER OUTPUT MONO REAR SPEAKER OUTPUT L R ON SAFE STATUS 57mm (2 1 /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 wit

• Boston Acoustics GT-42, Power/B+ and Power/GND Connection Strip approximately 5 /8" (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. Make sure that the chassis connection point is free of rust, grease, dirt, paint, and other materials that may insulate the ground wire from making proper connection. Tighten the B+ and G

• Boston Acoustics GT-42, 12 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. Installation—Fuses and Wiring (cont.) 1) Music The material chosen for head unit/amplifier system setup must be both clear in recording quality and dynam- ic in amplitude. Many audiophile “test” discs have musical tracks with both of these characteristics and should be used. 2) FRONT and REAR Sensitivity Controls Turn controls all the way counterclockwise (minimum position). In this position, the amplifier will be less se

• Boston Acoustics GT-42, 13 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. Turn head unit on, and verify that the GREEN status LED is lit on the amplifier. 6) FRONT Input Sensitivity Control Slowly rotate control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate FRONT Input Sensitivity counter

• Boston Acoustics GT-42, 14 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. You may find while setting the “Q” that bottoming may be detected in the front speakers; lowering the “Q” input sensitivity or raising the highpass crossover poin

• 15 5) REAR Input Sensitivity Control Turn controls all the way counterclockwise (minimum position). In this position, the amplifier will be less sen- sitive to the input signal from the head unit. Slowly rotate this control clockwise until maximum undistorted playing level is heard from the subwoofers. Listen closely for faults such as bottoming from the subwoofer. If fault is detected, rot

• Boston Acoustics GT-42, 16 System Examples System A—Full-Range Front with Full-Range Rear 6 . 5 L F 6 . 5 L F 6 . 5 L F 6 . 5 L F fuse to + battery terminal to ground fuse to + battery terminal to ground System B—Full-Range Front with Rear Fill 6 . 5 L F 6 . 5 L F 6 . 5 L F 6 . 5 L F fuse to + battery terminal to ground fuse to + battery terminal to ground

• Boston Acoustics GT-42, 17 System Examples (cont.) System C—Main Speakers with Single Subwoofer (2Ω) System D —Main Speakers with Parallel 4Ω Subwoofers (2Ω load) 6 . 5 L F 6 . 5 L F 10.5LF 2Ω fuse to + battery terminal to ground fuse to + battery terminal to ground 6.5LF6.5LF 6 . 5 L F 6 . 5 L F fuse to + battery terminal to ground fuse to + battery terminal to ground

• Boston Acoustics GT-42, 18 Amplifier Troubleshooting Guide Status LEDs on Amplifier not Lit—Head Unit (Source) Turned “ON” 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 Status LEDs Lit, no Output from Speakers— Speakers in Normal Operating Condition Verify High-level cables from speaker(s)

• Boston Acoustics GT-42, 19 Contact and Warranty Information 300 Jubilee Drive Peabody, MA 01960 U.S.A. (978) 538-5000 Boston, Boston Acoustics, and the Boston logo are registered trademarks of Boston Acoustics, Inc. © 2003 Boston Acoustics, Inc. All rights reserved. Specifications subject to change without notice. P/N 042-001630-1 www.bostonacoustics.com 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 ch

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