User manual BOSTON ACOUSTICS GT28

[. . . ] The range of operation is 0. 7­1. 2. dB Q +1. 6dB 0dB -3dB . 707 . 95 1. 2 t (tuned crossover frequency) 9 Subwoofer Level Control Port SUBWOOFER LEVEL switch should be set to "OFF" when control circuit is not installed, (see optional Subwoofer Level Control owners manual). 10 Status LED Indicators GREEN indicates the normal operating condition; the amplifier is "ON. " GREEN and RED together are normal when the amplifier is first turned "ON"; RED will turn off after a few seconds. When both GREEN and RED remain on, the amplifier is in thermal shutdown condition. RED only indicates a fault condition, "SAFE. " 5 Mechanical Functions Recessed RCA Inputs The input jacks are recessed into the body of the amplifier to provide clearance in tight mounting locations. 1 inch 1 inch Control Cover Removal and Reinstallation The cover panel is secured with two (2) captive coin-slotted screws. Coin-slotted screws allow a coin edge to be used as a screwdriver to remove the panel. Multi-Position Mounting Feet The mounting feet are designed to slide in both directions to clear installation obstructions on the mounting surface. [. . . ] Failure to do so could lead to an electrical short if the wire insulation is worn through and the power wire is shorted to ground. 1/ " 4 Strip 5/8" (16mm) Remote Input Connection Use the supplied FEMALE quick-connector to connect the REMOTE trigger lead from the head unit to the amplifier. Crimp connector to wire from head unit that controls remote turn-on (refer to head unit owner's manual). Once the quick-connector is crimped into place, carefully push connector onto recessed MALE REMOTE terminal adjacent to the RCA input pair. Only one (1) remote turn-on terminal should be connected. Speaker Output Connection Prepare each wire by stripping approximately 5/8" (16mm) of insulation. The positive (+) speaker wires are installed into the amplifier terminals marked "SPEAKER OUTPUT" / "+". The negative (­) speaker wires are installed into the amplifier terminals marked "SPEAKER OUTPUT" / "-". Tighten the "SPEAKER OUTPUT", "+", and "-" terminals with the supplied 2mm hex wrench to secure the wires into the terminals. If the speaker wires must be routed through a drilled or existing hole, use a nylon panel grommet to prevent fraying the wire insulation. A distorted signal from the head unit sent to the amplifier can cause loudspeaker failure at higher listening levels! 6) Input Sensitivity Control Slowly rotate control clockwise until maximum undistorted playing level is heard from the speakers. Listen closely for bottoming from the speakers. If detected, rotate INPUT SENSITIVITY control counterclockwise until it is eliminated. 0. 6 5 7) Crossover Controls To achieve higher undistorted playing levels from the main speakers, the highpass crossover must be engaged. Rotate crossover control fully clockwise. The highpass crossover point is now set at 350Hz. Rotate "Q" Control fully counterclockwise. Move crossover switch to the right (ON) position. Slowly rotate the INPUT SENSITIVITY control clockwise 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. Slowly rotate the highpass crossover control counterclockwise while listening for bottoming. You are lowering the crossover point, which means that more bass signal is being sent to the speakers. If bottoming is detected, rotate the INPUT SENSITIVITY control counterclockwise until it is eliminated and/or rotate the HIGHPASS crossover control clockwise to raise the crossover point. OFF H I G H PA S S ON 350 185 Hz 20 13 Setup Tuning--Full-Range Speakers (cont. ) 8) "Q" Control Once the highpass crossover point has been determined, use the "Q" control to increase the bass information centered around the crossover point. [. . . ] Your responsibilities are to use the system according to the instructions supplied, to provide safe and secure transportation to an authorized Boston Acoustics service representative, and to present proof of purchase in the form of your sales slip when requesting service. Excluded from this warranty is damage that results from abuse, misuse, accidents, shipping, or repairs or modifications by anyone other than an authorized Boston Acoustics service representative. This warranty is void if the serial number has been removed or defaced. This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. If Service Seems Necessary First, contact the dealer from whom you purchased the amplifier. [. . . ]