Boston GT-42 Specifications

GT-424-Channel, High-Current/High-Power Amplifier

10Passenger and Trunk Compartment MountingIf the amplifier is mounted under a seat, be sure that the vents do not becomeblocked. Do not allow seat padd

Power/B+ and Power/GND ConnectionStrip approximately 5/8" (16mm) of insulation. The positive (+) power wireis installed into the amplifier termina

12Mono Subwoofer OperationIf the amplifier is to be bridged and used with a subwoofer connected to the REAR channels, use the“SPEAKER OUTPUT” terminals

13Setup Tuning—Full-Range Speakers (cont.)4) Head UnitThe head unit should have all controls such as bass, treble, balance, and fader set to the flat o

148) FRONT “Q” ControlOnce the FRONT highpass crossover point has been determined, use theFRONT “Q” control to increase the bass information centered

155) REAR Input Sensitivity Control Turn controls all the way counterclockwise (minimum position). In this position, the amplifier will be less sen-sit

16System ExamplesSystem A—Full-Range Front with Full-Range Rear6.5LF6.5LF6.5LF6.5LFfuseto + battery terminalto groundfuseto + battery terminalto g

17System Examples (cont.)System C—Main Speakers with Single Subwoofer (2Ω)System D —Main Speakers with Parallel 4Ω Subwoofers (2Ω load)6.5LF6.5LF10.5L

18Amplifier Troubleshooting GuideStatus LEDs on Amplifier not Lit—Head Unit (Source) Turned “ON”Verify Remote turn-on wire from source to amplifier has p

19Contact and Warranty Information300 Jubilee DrivePeabody, MA 01960 U.S.A.(978) 538-5000Boston, Boston Acoustics, and the Boston logo areregistered t

2Table of ContentsParts List 3Features and Specifications 3Control Functions 4Control functions (cont.) 5Control functions (cont.) 6Mechanical Function

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 pow

4Control FunctionsFRONT RCA InputsRCA cables marked “FRONT” from head unit or from other line level deviceshould be connected here. Use both inputs (L

5Control Functions (cont.)“Q” Control“Q” Control is active when the highpass crossover is engaged and is centeredon the selected crossover point. The

6Mechanical FunctionsRecessed RCA InputsThe input jacks are recessed into the body of the amplifier to provide clear-ance in tight mounting locations.C

7Mechanical Functions (cont.)Amplifier LinkingThe design of the side panels enables multiple amplifiers to be used together without additional hardware.

8Before You InstallBefore you install the unit, disconnect the negative (–) battery cable in the engine compartment of the vehi-cle. Doing so will pre

913mm (1/2”)548mm (215/8”)225mm (87/8”)Choose the Mounting LocationPlan your installation so that the amplifier is mounted where adequate ventilation i