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). HIGHPASS ON/OFF Pushing this button "IN" engages the Highpass filter. Pushing this button "OUT" will bypass the filter. Note: By engaging both Highpass and Lowpass filters and setting the desired crossover points, a Bandpass filter can be created: Notice that the outer most circle of numbers (1:00, 2:00, etc.) represent numbers as they appear on the face of a clock. The number underneath each "hour" designation on the simulated clock face is the approximate crossover frequency at that position. BRIDGING All pairs of Diamond Audio D7 amplifier channels are capable of being bridged to a 4 Ohm mono output. Creation of the mono channel is accomplished by using the left channel positive (+) output connection of the amplifier for the speaker positive and the right channel negative (-) output connection of the amplifier for the speaker negative. Example: Two 8 ohm Woofers Wired In Parallel = 4 ohm Bridged Impedance. D7 CROSSOVER FREQUENCIES Diamond Audio D7 Professional Reference Series Amplifiers feature fully variable crossovers. The frequency control knobs (located in the tray on the top of the amplifier) are labeled 50Hz when the knob is rotated fully counterclockwise (left) and 5kHz when rotated fully clockwise (right). To make basic setting of the crossover frequencies a little easier, we've come up with the following rotational diagram: HIGHPASS/LOWPASS FREQUENCY Note: It is important that a 4 Ohm minimum total speaker impedance load is observed! If an impedance load of less than 4 Ohms is used, you will eventually damage your amplifier and void your warranty. RCA INPUTS AND OUTPUTS The D7056 Professional Reference Amplifier features 3 pairs of stereo input RCA jacks. Each pair of amplifier channels can be driven separately or they can be combined in a number of different ways. This amplifier IS NOT equipped with an AUXILIARY Crossover. 10 11 Note: To set crossovers, first remove the two 1/16" Allen screws holding down the security cover using the Allen key provided. When reinstalling the cover be careful not to overtighten the screws. Damage to the cover may result. As seen in the above drawing, the function of the RCA inputs, outputs, and feature buttons are as follows: CH 1/2 INPUT The RCA cables from your source unit should be inserted here. -12dB BUTTON: CH 1/2 To the right of the CH 1/2 INPUT RCAs you will find the -12dB button. Pushing this button: "IN" allows your amplifier to accept signal voltages as high as 12VRMS. Pushing this button "OUT" configures the amplifier to accept signal voltages up to 6VRMS. -12dB BUTTON: CH 3/4 Works the same as above, but for the CH 3/4 INPUT RCAs. CH 3/4 INPUT Additional RCA cables from your source unit should be inserted here. CH 3/4 INPUT SELECT Pushing this button "IN" allows signals from CH 1/2 to be sent to both CH 1/2 and CH 3/4 INPUTS allowing use of a single pair of RCA cables (see block diagram page 16) for channels 1 thru 4. -12dB BUTTON: CH5/6 Works the same as above but for the CH 5/6 INPUT RCAs. CH 5/6 INPUT Additional RCA cables from your source unit should be inserted here. CH 5/6 INPUT SELECT Pushing this button "IN" sums the signals from CH 1/2 and CH 3/4 to the CH 5/6 INPUTS (all inputs are in parallel). All six channels will receive signal from a single left/right RCA pair. Example: When using an D7056 amplifier for separate tweeters, midrange, and midbass drivers on the front RCA outputs of a source unit, this button sums the signals from CH 1/2 and CH 3/4. Pushing this button "IN" will provide "non-fading" bass if CH 5/6 are used Lowpass for subwoofers. Pushing this button to the "OUT" position allows an additional pair of RCA signal cables to drive channels 5 and 6 directly. Example: If your source unit has subwoofer RCA outputs, they can go here to allow your source unit to control the subwoofer level. CROSSOVER CONTROLS: CH 1/2, CH 3/4, CH 5/6 As seen in the above drawing, the function of the crossover controls (from left to right) are as follows: GAIN This control matches the output voltage of the source unit or processor to the amplifier inputs. Rotating this control to the "MIN" mark (counterclockwise) configures your D7 amplifier to accept input voltages as high as 12V RMS with the -12dB button pushed "IN" (see "RCA INPUT" drawing on page 12). This control should be set as low as possible. The basic procedure for setting input gains is as follows: 1. Adjust all amplifier gain controls to just above the minimum setting (fully counterclockwise). If your source unit output voltage is less than 6 Volts RMS, push the ­12dB button for the selected channel pair to the "OUT" position. If the available signal voltage is more than 6 Volts RMS, push the -12dB button to the "IN" position. Using the highest quality source (usually CD) play some music and slowly turn up the source unit until you can hear distortion. Now turn down the volume until the distortion stops. This is your maximum source unit level. Turn up the amplifier gain until audible distortion starts. Turn down the gain to the point JUST BELOW the start of the distortion. Repeat step 3 for all amplifiers in your system. 2. 3. 4. Please refer to the Diamond Audio Level Setting Technical Brief available from the Tech Department for a comprehensive level setting procedure. 12 9 SPEAKER WIRING Diamond Audio recommends using speaker wire of at least 16 gauge. Lay out the wire in the vehicle from the individual speaker locations to the amplifier(s). Observe safe wiring precautions. Your D7 Professional Reference Series Amplifier will accept speaker wire up to 10 gauge directly. Locate the speaker terminal block on the end of the amplifier. Strip approximately 1/2 inch of insulation from the wire, insert the wire into the terminal, and tighten the Allen screw. Repeat for all speaker wires. Please observe our recommended minimum speaker impedances to prevent possible damage. Banana Jacks using up to 8 gauge wire can be inserted into the speaker block. Remove the set screw completely and insert the Banana Jack into the end of the block. THERMAL MANAGEMENT SYSTEM All D7 Professional Reference Series Amplifiers feature our Intelligent Thermal Management System . All amplifiers feature one or two (depending on model) internally mounted temperature-controlled cooling fans. Care should be taken to allow adequate "breathing room" (approximately 2 inches) on all sides of the installed amplifier to allow the system to operate at peak efficiency. Cool outside air is drawn into the amplifier through the side vents on each end panel. The air is then drawn over the top of the main circuit board, down through the fan over the internal heat sink fins (in two directions) and out through exhaust vents on the bottom of each end panel. In this way, the cooling fan(s) remain nearly inaudible under almost all listening conditions. CROSSOVERS All Diamond Audio D7 amplifiers employ the most flexible internal crossover sections currently available in mobile audio. They feature third-order 18dB/ octave Butterworth filters. These filter networks sum to a flat response at their -3dB break points. This results in a smooth and seamless transition from one frequency band to the next. Butterworth filters provide maximally flat frequency responses when compared to other filter structures. All crossover controls are mounted on the top of the amplifier. Each crossover is continuously variable from 50Hz to 5kHz. Each pair of channels has an individual network that can be configured to Highpass, Lowpass, Bandpass or All-pass by simple switch selection. When switched off, they are completely out of the audio path. Two and four-channel D7 amplifiers also provide a separate fullyindependent crossover for the output RCA jacks providing filter control of any other amplifier. When D7 amplifiers operate at high power for prolonged periods, the temperature sensors instruct an intelligent monitoring circuit to speed up the fan(s) until the amplifier has cooled down to its normal operating temperature. Amplifier models D7402 and D7104 also feature our unique Power-Flow Busbar. The shroud connecting and covering the two internal cooling fans of these amplifiers is made of solid nickel-plated copper. Each end of this fan shroud is soldered to full width pads on the main circuit board. The center of this shroud is attached to the fans at eight points. The high current ground path for the speakers now travels over the cooling fans through the shroud, which functions as a busbar. At the same time, these high current signals are completely isolated from the circuit board traces that carry low-level signals. 8 13 An additional temperature monitoring circuit protects the D7 amplifier under extreme high power or extreme high-ambient temperature conditions. As the heat sink temperature reaches 185 degrees Fahrenheit, this circuit gradually turns down the high-current rail voltages, reducing the amplifier power dissipation. This circuit only effects the high current stage of the power supply; the operation of the sensitive low current audio circuits remain unchanged. Only the maximum output power is affected, and only until the heat sink cools down. Under no conditions will the D7 Series amplifiers have to shut off completely. If a problem arises, refer to the troubleshooting section (page 15) or call the Diamond Audio Technical Department at (480) 813-6205 for assistance. A WORD ABOUT BATTERIES AND HIGH OUTPUT ALTERNATORS... 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 G AUGE 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 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. This should also work. 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. A WORD ABOUT POWER AND GROUND CABLE G AUGE... 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. Diamond Audio D7 amplifiers are more efficient. Others may be less. Using cable of a larger gauge will only increase the current capability of your system. Do not use cable of a smaller gauge than suggested here. FORMULA: Total amplifier rated RMS power x 2 = Total Input Wattage Total Input Wattage = Current Draw (in Amps) Battery Voltage EXAMP ...