5-Channel Amplifier Owners Manual
Introduction Thank you for choosing Boston AcousticS® and congratulations on your purchase of the Boston GJTB> Amplifier. If you own other Boston products, the outstanding audio performance and ease-of-use of the GT Amplifier should come as no surprise. If you're new to Boston, welcome - you've made a great choice.
Parts List Included Hardware: GT-5750 Installation Manual 1 Female Quick-Connect Terminal 1 (for remote turn-on input) 2mm Hex Wrench 1 3mm Hex Wrench 1 6 Mounting Screws Specifications Technical Specifications: GT-5750 Front and Rear Channels Rated Power (CEA-2006-A): @4-0hm: @2-0hm: 70 Watts x 4 100 Watts x 4 Subwoofer Channel Rated Power (CEA-2006-A): @4-0hm: @2-0hm: 250 Watts x 1 375 Watts x 1 Front and Rear Channels Rated Power (12v): @4-0hm: 50 Wattsx4 Subwoofer Channel Rated Power
Connections GT-5750 o 8 8 o e o 8 o o «i> Front Channel RCA Input Remote Turn-On (female spade connector supplied) Rear Channel RCA Input Subwoofer Channel RCA Input Remote Gain Port (refer to GT-RSL manual for installation instruction) Front Left & Right Speaker Outputs (12-gauge accepted) Rear Left & Right Speaker Outputs (12-gauge accepted) Subwoofer Mono Speaker Outputs (12-gauge accepted) 12v Power Input (4-gauge accepted) Ground Wire Inputs (4-gauge accepted) B!P Panel Removal/Installation The
Controls GT-5750 o Front Channel Input Sensitivity (250mv to 8.0v - continuously variable) 8 Front Channel Highpass Frequency Adjustment (20Hz to 350Hz - variable) • Front Channel Highpass Crossover OFF/ON Switch o Front Channel Highpass Crossover Q-Tune™ Adj. (0.707 to 1.6 - variable) Rear Signal Routing Switch (Sends Front RCA Signal to Rear Channels) 0) Rear Channel Input Sensitivity (250mv to 8.
Installation - General 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. Before You Install Before you install the unit, disconnect the negative (-) battery cable in the engine compartment of the vehicle.
Installation - Wiring Amplifier Fuses Although the amplifier has an internal fuse, additional fuse protection should be installed as close as possible to the battery on the positive (+) power wire going to the amplifier. An inline fuse should be installed at no more than 18" (46cm) on the positive (+) power wire. The rating of the inline fuse should equal the value of the internal fuse of the amplifier if only the single amplifier is connected to this wire.
Tuning The Amplifier - Front and Rear Sp_ea_k_e_r_s _ 1) Music The material chosen for system tuning must be both clear in recording quality and dynamic in amplitude. Many audiophile "test" discs have musical tracks with both of these characteristics and should be used. 2) Front, Rear, and Subwoofer Input Sensitivity Controls Turn controls all the way counterclockwise (minimum position).
Tuning The Amplifier - Front and Rear Sp_e_ak_e_r_s _ 7) Input Sensitivity Control Starting with the front channels, slowly rotate the control clockwise (refer to the diagram on page 5) until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate the input sensitivity control counterclockwise until it is eliminated. Repeat for the rear channels.
Tuning The Amplifier - Subwoofer (s) 1) Subwoofer Signal Routing Switch Move switch to left position (L+R Inputs) when used with Left and Right subwoofer RCA outputs. Move switch to middle position (L Mono Input) when used with single subwoofer RCA outputs. Move switch to right position (Signal from Front RCA) when subwoofer signal is to be derived from front and rear channels.
Tuning The Amplifier - Subwoofer (5) 5) Subwoofer Input Sensitivity Control Turn control (refer to the diagram on page 5) all the way counterclockwise (minimum position). In this position, the amplifier will be less sensitive to the input signal from the head unit. Slowly rotate this control clockwise until maximum undistorted playing level is heard from the subwoofer(s). Listen closely for faults such as bottoming from the subwoofer(s).
Amplifier Troubleshooting Guide Status LEOs on Amplifier not Lit-Head Unit (Source) Turned NON" Remote turn-on wire from source to amplifier has proper voltage Verify Power (B+) connections at amplifier, terminal blocks, and battery are secure Ground (GND) connections at amplifier and vehicle chassis are secure Battery B+ fuse and amplifier fuse are OK B+ at battery and B+ at amplifier have proper voltage Status LEOs Lit, no Output from Speakers-Speakers in Normal Operating Condition Verify High-level cable
