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Boston Acoustics GT-50 - page 1
GT-50 5-Channel, High-Curr ent/High-Power Amplifier ...
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Boston Acoustics GT-50 - page 2
2 T able 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 r emoval and reinstallation 6 Multi-position mounting feet 6 Mechanical functions (cont.) 7 V ents 7 Amplifier linking 7 Wi re connection 7 Fuses 7 General Installation Pr ...
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Boston Acoustics GT-50 - page 3
Included Hardwar e (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 -50 Specifications 14.4VDC Power Multi-Channel Power @ 4 Ω 4x55W , 1x250W Multi-Channel Power @ 2 Ω 4x85W , 1x350W Mixed Op. Power @ 4 Ω , ...
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Boston Acoustics GT-50 - page 4
4 Contr ol Functions FRONT RCA Inputs RCA cables marked “FRONT” from head unit or fr om other line level device should be connected here. Use both inputs (L & R) for ster eo. FRONT , REAR, and SUBWOOFER Remote Inputs Use the supplied FEMALE quick connector to connect the REMOTE trigger lead from the head unit to the amplifier . Amplifier ...
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Boston Acoustics GT-50 - page 5
FRONT and REAR “Q” Controls “Q” Control is active when the highpass cr ossover 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 ster eo. REAR Input S ...
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Boston Acoustics GT-50 - page 6
6 Mechanical Functions Recessed RCA Inputs The input jacks are r ecessed 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 scr ews. Coin-slot- ted screws allow a coin edge to be used as a scr ewdriver to remove the ...
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Boston Acoustics GT-50 - page 7
Mechanical Functions (cont.) V ents (Side and Rear) The cooling vents must be kept clear of obstructions once the amplifier is installed. Failure to do this could lead to prematur e thermal shutdown or amplifier failure. Amplifier Linking The design of the side panels enables multiple amplifiers to be used together without additional hardwar e. ...
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Boston Acoustics GT-50 - page 8
8 Before Y ou 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 RCA ...
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Boston Acoustics GT-50 - page 9
13mm ( 1 / 2 ”) 225mm (8 7 / 8 ”) SUBWOOFER OUTPUT HIGHPASS OFF ON 5 0.2 V INPUT SENSITIVITY 2.6 20 350 Hz 200 REMOTE POWER B+ B+ POWER GND GND FUSE 3 x 30A FRONT SPEAKER OUTPUT L R REAR SPEAKER OUTPUT L R 12dB 24dB OFF LOWPASS 50 350 Hz 200 NON PRINTABLE AREA REAR INPUT STEREO MONO L+R HIGHPASS OFF ON 5 0.2 V INPUT SENSITIVITY 2.6 0.7 1.2 Q/HP ...
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Boston Acoustics GT-50 - page 10
10 Passenger and T runk 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 c ...
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Boston Acoustics GT-50 - page 11
FRONT SPEAKER OUTPUT L R REAR SPEAKER OUTPUT L R Power/B+ and Power/GND Connection Strip approximately 5 / 8 " (16mm) of insulation. The positive (+) power wir e is installed into the amplifier terminal marked “B+.” The negative (–) wire is installed into the terminal marked “GND.” The ground wir e should be as short as possible and ...
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Boston Acoustics GT-50 - page 12
12 Mono Subwoofer Operation Connect either a 2-ohm or 4-ohm subwoofer to a single (+) and (-) terminal (see System A, page 16). When using two (2) subwoofers, each subwoofer should be a minimum 4-ohm [or higher] impedance, (see System B, page 17). W ARNING! Subwoofer impedance must not fall below 2 ohms when in MONO mode. Installation—Fuses and W ...
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Boston Acoustics GT-50 - page 13
13 Setup T uning—Full-Range Speakers (cont.) 4) Head Unit The head unit should have all controls such as bass, tr eble, 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 ...
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Boston Acoustics GT-50 - page 14
14 8) FRONT and REAR “Q” Controls Once the FRONT highpass crossover point has been determined, use the FRONT “Q” control to incr ease the bass information centered ar ound the crossover point. Setting the front “Q” contr ol is done in conjunction with setting the levels on the input sensitivity and highpass crossover fr equency controls ...
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Boston Acoustics GT-50 - page 15
15 5) SUBWOOFER Sensitivity Control Tu rn controls all the way counter clockwise (minimum position). In this position, the amplifier will be less sen- sitive to the input signal from the head unit. Slowly r otate this control clockwise until maximum undistorted playing level is heard fr om the subwoofers. Listen closely for faults such as bottomin ...
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Boston Acoustics GT-50 - page 16
16 System Examples SYSTEM A—Front, Rear , and Single 2 Ω Subwoofer (2 Ω load) L R L R ON ON SAFE SAF E 6 . 5 L F 6 . 5 L F fuse to + battery terminal to gr ound fuse to + battery terminal to ground 12.5LF 6 . 5 L F 6 . 5 L F ...
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Boston Acoustics GT-50 - page 17
17 SYSTEM B—Front, Rear , and Dual 4 Ω Subwoofers (2 Ω load) with Discrete Subwoofer Input L R L R ON ON SAFE SAF E 6 . 5 L F 6 . 5 L F fuse to + battery terminal to gr ound fuse to + battery terminal to ground 6 . 5 L F 6 . 5 L F 12.5LF 12.5LF (from pr ocessor) ...
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Boston Acoustics GT-50 - page 18
18 Amplifier T r oubleshooting Guide Status LEDs on Amplifier not Lit — Head Unit (Sour ce) T urned “ON” V erify Remote turn-on wire fr om source to amplifier has pr oper voltage Power (B+) connections at amplifier , terminal blocks, and battery are secure Ground (GND) connections at amplifier and vehicle chassis ar e secure Battery B+ f ...
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Boston Acoustics GT-50 - page 19
19 Contact and W arranty Information 300 J ubilee Drive Pe a b o d y, MA 0 1 960 U.S.A. (978) 538-5000 Boston, Boston Acoustics, and the Boston logo are r egister ed trademarks of Boston Acoustics, Inc. © 2003 Boston Acoustics, Inc. All rights reserved. Specifications subject to change without notice. P/N 042-001655-1 www .bostonacoustics.com Lim ...
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