2-Channel Amplifier Owners Manual GT-275 GT-2125 GT-2200 GT-2300
Table Of Contents Introduction Thank you for choosing Boston Acoustics and congratulations on your purchase of the Boston GT 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 – we think you’ve made a great choice.
Parts And Specifications Parts List Included Hardware: GT-275 GT-2125 GT-2200 GT-2300 Installation Manual Female Quick-Connect Terminal 1 1 1 1 1 1 1 1 1 1 4 1 1 4 1 1 4 1 1 6 Technical Specifications: GT-275 GT-2125 GT-2200 GT-2300 Rated Power (CEA-2006-A): @ 4-Ohm (Stereo): @ 2-Ohm (Stereo) @ 4-Ohm (Mono) @ 2-Ohm (Mono) 75 Watts x 2 120 Watts x 2 225 Watts x 1 300 Watts x 1 125 200 400 600 200 350 700 900 2 2 1 1 300 Watts x 2 500 Watts x 2 1000 Watts x 1 1400 Watts x 1 Rated Pow
Connections Connections GT-2300 1 2 3 4 5 6 GT-2200 1 2 3 4 GT-2125 u v w x y z 1 5 6 GT-275 2 3 4 5 6 1 2 Stereo RCA Input Remote Turn-On (female spade connector supplied) Remote Gain Port (refer to GT-RSL manual for installation instruction) Left/Right/Mono Speaker Outputs (12-gauge accepted) 12v Power Input (4-gauge accepted) Ground Wire Input (4-gauge accepted) Top Panel Removal / Installation The cover panel is secured with two (2) 3mm screws.
Controls Controls GT-2300 1 2 3 4 5 6 7 8 9 10 GT-2200 2 3 4 1 5 6 7 GT-2125 10 GT-275 1 u v w x y z { | } ~ 8 9 2 3 4 5 6 7 8 9 10 1 4 5 6 7 8 9 10 Stereo/Mono Switch Remote Gain OFF/ON Switch (ON when using GT-RSL) Lowpass Slope Switch (12dB Stereo, 12dB Mono, or 24dB Mono) Lowpass Crossover OFF/ON Switch (OFF/12dB/24dB on GT-275) Lowpass Frequency Adjustment (50Hz to 350Hz - continuously variable) Input Sensitivity (250mv to 8.
Installation - General 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.
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 - Front / Rear Speakers Tuning The Amplifier - Front or Rear Speakers 1) Music The material chosen for head unit/amplifier system setup 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) Input Sensitivity Control Turn control all the way counterclockwise (minimum position).
6) Input Sensitivity Control 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. 7) Crossover Controls To achieve higher undistorted playing levels from the main speakers, the highpass crossover must be engaged.
Tuning - Subwoofers Tuning The Amplifier - Subwoofer (s) 1) Input Switch Move switch to the right-hand (MONO) position (refer to the diagram on page 5); the inputs are summed to mono. Connect the subwoofer to the speaker output terminals marked for mono operation. NOTE: Subwoofer impedance is 2 ohms minimum. 2) 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.
5) Lowpass Crossover Control Move the selector switch to “ON” (refer to the diagram on page 5). In this setting, lowpass signal is sent to the speaker outputs. Experiment with the crossover point settings while the subwoofer is active. A higher setting will increase the perceived output, and a lower setting will make the bass response more omnidirectional. 12 or 24dB crossover slopes are available. Depending on your installation and listening preferences, one will work more effectively.
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 and amplifier fuse are 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 cable
