User manual DIAMOND AUDIO D7 2CX

[. . . ] LOWPASS ON/OFF Pushing this button "IN" engages the Lowpass filter. Pushing this button "OUT" will bypass the 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). [. . . ] 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. Strip approximately 1/2 inch of insulation from the wire. Insert the wire into the terminal, and tighten the Allen screw. Your D7 Professional Reference Series Amplifier will accept remote turn-on wire up to 10 gauge directly. AW ORD ABOUT POWER AND GROUND CABLE GAUGE. . . The following basic formula can be used as a quick guide to determine the total amperage draw of a mobile audio system. This formula is based on a 50% amplifier efficiency rating. 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. If speakers and wires are OK, contact your authorized dealer. Amplifier volume gets gradually softer as music is playing without touching any system controls. Amplifier is going into thermal protection. Make sure amplifier has room for fan(s) to breathe. [. . . ] MOUNTING YOUR AMPLIFIER WARNING -- AMPLIFIERS GENERATE HEAT!You can mount your amplifier in any position, even upside down. Do not install your amplifier under carpets or behind airtight panels. Without air circulation, your amplifier will reduce its power output to protect itself. [. . . ]