Introduction Thank you for choosing Boston Acoustics 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 – you’ve made a great choice.
Slope (dB Per Octave): Signal Voltage Input Range: Fuse Amp Rating: Dimensions: Width: Height: Depth: GT-475 GT-4100 GT-475 GT-4100 75 Watts x 4 100 Watts x 4 120 Watts x 4 150 Watts x 4 250 Watts x 2 450 Watts x 2...
Controls GT-4100 GT-475 Signal Routing Switch (Sends Front RCA Signal to Rear Channels) Front Channel Input Sensitivity (250mv to 8.0v - continuously variable) Front Channel Highpass Frequency Adjustment (20Hz to 350Hz - variable) Front Channel Highpass Crossover OFF/ON Switch Front Channel Highpass Crossover Q-Tune...
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"...
Tuning The Amplifier - Front and Rear Speakers 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 Signal Routing Switch If using two sets of RCAs (independent front and rear RCAs), set the switch to DEDICATED FRONT AND REAR INPUTS .
Tuning The Amplifier - Front and Rear Speakers 6) Input Sensitivity Control Starting with the front channels, slowly rotate the control clockwise (refer to the diagram on page 5) until maxi- mum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detect- ed, rotate the input sensitivity control counterclockwise until it is eliminated.
Tuning The Amplifier - Front Speakers and Subwoofer (s) 1) Front Signal Routing Switch If using two sets of RCAs (independent front and rear RCAs), set the switch to DEDICATED FRONT AND REAR INPUTS . If you are using one set of RCAs for both front and rear channels, set the switch to SEND FRONT RCA SIGNAL TO REAR.
The remote level control (GT-RSL) gives you independent level adjustment of the subwoofer’s output level beyond the standard system volume control. Please refer to the RSL’s manual for installation instruction. The GT-RSL is available separately, please consult your authorized Boston Acoustics dealer. fuse...