User manual DIAMOND AUDIO D7 2CX

[. . . ] LOWPASS ON/OFF Pushing this button "IN" engages the Lowpass filter. LOWPASS FREQUENCY Turning this control sets the Lowpass crossover point from 50Hz (fully counterclockwise) to 5kHz (fully clockwise). HIGHPASS FREQUENCY Turning this control sets the Highpass crossover point from 50Hz (fully counterclockwise) to 5kHz (fully clockwise). HIGHPASS ON/OFF Pushing this button "IN" engages the Highpass filter. [. . . ] If a problem arises, refer to the troubleshooting section (page 15) or call the Diamond Audio Technical Department at (480) 813-6205 for assistance. The battery in your car is a chemical storage device for electrical energy generated by the alternator. It is capable of briefly supplying high currents for cold starting the vehicle as well as powering other important electrical loads either partially or entirely for a limited period when the engine is off. In order to supply the power required for ignition, lighting, large audio systems etc. a car needs its own efficient, reliable, and constantly available source of energy. When the engine is stopped, the battery is the vehicle's energy source. When the engine is running, the alternator is the on-board "electricity generating plant. " It is the job of the alternator to supply power to all current-consuming loads (including the audio system). Alternator output, battery capacity, and power demand of all electrical loads and systems must be matched as ideally as possible so the entire system is reliable and trouble-free in operation. In the most basic of terms, this means that car audio is gasoline powered. Extra batteries are primarily for the extended operation of your audio system when the engine is off or for SPL competitions where high sound pressure levels are generated for short periods of time and large battery racks are needed to provide the necessary current demanded by the many amps used. D7 Professional Reference Series Amplifiers are capable of reproducing "concert level" volumes with incredible accuracy. Care must be taken to ensure that your vehicle is capable of supplying the voltage and current required by such a system. POWER CABLE GAUGE CHART Note: If you are installing multiple amplifiers, add up the total current draw for all of them and choose the appropriate gauge based on the grand total. Example: Amplifier 1: D7054 (driven at 4 ohms) = 33 amps Amplifier 2: D7152 (driven at 4 ohms) = 50 amps Amplifier 3: D7152 (driven at 4 ohms Bridged) = 100 amps Grand Total = 183 amps 14 D7152 and D7402 manual #135. p65 7 8/30/2002, 2:28 PM 7 TURN-ON CONNECTION (REMOTE) Locate the terminal labeled "REMOTE" between the ground and +12V power connection points on the end of the amplifier. Your source unit should have a wire in its harness labeled "REMOTE" or "AMP TURN-ON. " Some source units come equipped with a "Power Antenna" lead only. Run this wire from your source unit to the amplifiers REMOTE connection. Your D7 Professional Reference Series Amplifier will accept remote turn-on wire up to 10 gauge directly. The following basic formula can be used as a quick guide to determine the total amperage draw of a mobile audio system. One or more pairs of amplifier channels "squeal" when operating. One or more speaker wires are shorted or one or more speaker voice coils are shorted or rubbing. Amplifier volume gets gradually softer as music is playing without touching any system controls. Preventing air from reaching the heatsink will cause the amplifier to overheat, as will running the amplifier at too low of an impedance. 6 D7152 and D7402 manual #135. p65 6 8/30/2002, 2:30 PM 15 AMPLIFIER BLOCK DIAGRAM (D7152 AND D7402) to the bare metal using a bolt, star washer and nut. Strip approximately 1/2 inch of insulation from the other end of the cable and insert it into the ground block on the amplifier and tighten the Allen screw. [. . . ] If this last-chance plea for dealer assistance doesn't sway you, the following instructions will make the installation of your new amplifier a little easier. Before starting your installation, remove the negative battery cable before working on the positive terminal to prevent a short to ground. If a short does occur, current will continue to flow until the short is opened, the main fuse blows, or the wire melts (possibly taking out any nearby flammable object, wire loom, etc. causing a fire or possibly even a tear in the fabric of time and space). [. . . ]