User manual BOSS GT GT1280

[. . . ] Run a 4 gauge wire (as short as possible) to the closest chassis ground point. Be sure to remove the paint at the connection to the chassis of the vehicle for a good electrical connection. Run a 16 gauge (or larger) wire to the remote turn-on lead of the head unit. Connect the speaker(s) as per the wiring diagrams in this manual. [. . . ] While these amplifiers are designed to operate with a minimum load of 1 Ohm, it is highly recommended that you design your system to operate with 2 Ohms minimum impedance. Operating a GT digital amp with a speaker impedance load of under 1 Ohm may result in poor sound quality and serious damage to the amplifier circuitry. Damage to your amplifier caused by operating with a load of less than 1 Ohm is not covered under the warranty for this product. Distribution Block Capacitor NOTE: The amplifier may receive its input signal from a head unit or signal processors subwoofer output. Bridging Two Amplifiers GT1500D and GT2500D Electrical Wiring All BOSS series power amplifiers are equipped with easy top access screw terminals. These terminals are n ickel-plated in order to ensure excellent electrical contact and to resist corrosion. (BRIDGED SWITCH : MASTER POSITION) When making electrical connections to the amplifier, please observe the following: Use at least 8 gauge or heavier wire for power and ground connections. Wire the amplifier directly to the car battery. Make sure there is circuit protection (such as a fuse) on the positive power lead, within 18 inches of the battery. For the ground connection, use the shortest possible wire to a good chassis ground point. Wire the Remote connection to the remote turn-on lead of your equalizer or head unit. In some cases this may be the power antenna lead of the head unit. Remote Subwoofer Level Control SPEAKER IMPEDANCE 4 - 8 OHMS! To Inputs of Satellite Amplifier From Outputs of Head Unit Your BOSS digital amplifier is equipped with a dashboard mount remote subwoofer level control. Run the supplied dashboard remote control from the front panel of your amplifier. Protections LED comes on when the amplifier is powered up Check for short circuits on speaker leads. Turn down the volume control on the head unit to prevent overdriving. Remove speaker leads, and reset the amplifier. If the Protection LED still comes on, then the amplifier is faulty. Check that amplifier is properly grounded. Check that Remote Input (turn-on) at amplifier has at least 3 volts DC present. Check that RCA patch cords are plugged into correct inputs. High hiss in speakers Disconnect all RCA inputs to the amplifiers. If the hiss disappears, then plug in the component driving the amplifier and unplug its inputs. If hiss disappears, go on until the faulty/noisy component is found. [. . . ] If hiss disappears, go on until the faulty/noisy component is found. In order to obtain the best subjective S/N ratio, set the Input Level to the lowest level possible which still delivers the volume level you desire. Troubleshooting, cont. High squeal noise from speakers Check all RCA interconnects. High squealing noises are almost always caused by RCA cables with poor grounding. Always use high-quality RCA interconnects in your audio system. [. . . ]