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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:
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 counter-
clockwise (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
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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 accomp-
lished 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.
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.
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Summary of Contents for Diamond Audio Technology D7056

  • Page 1 LOWPASS ON/OFF Notice that the outer most circle of numbers (1:00, 2:00, etc.) represent Pushing this button “IN” engages the Lowpass filter. Pushing this button numbers as they appear on the face of a clock. The number underneath each “OUT” will bypass the filter. “hour”...
  • Page 2 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.
  • Page 3: Speaker Wiring

    SPEAKER WIRING THERMAL MANAGEMENT SYSTEM Diamond Audio recommends using speaker wire of at least 16 gauge. All D7 Professional Reference Series Amplifiers feature our Intelligent Thermal Lay out the wire in the vehicle from the individual speaker locations to the Management System .
  • Page 4 POWER CABLE G AUGE CHART 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.
  • Page 5: Basic Troubleshooting

    TURN-ON CONNECTION (REMOTE) If you are considering a high output alternator or if you are not sure if your vehicle’s charging system needs to be upgraded, consult your Authorized Locate the terminal labeled “REMOTE” between the ground and +12V Diamond Audio Dealer. They will be happy to set you up with everything power connection points on the end of the amplifier.
  • Page 6: Amplifier Block Diagram

    AMPLIFIER BLOCK DIAGRAM to the bare metal using a bolt, star washer and nut. Seal the area from above (D7056) and below to prevent rust. 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.
  • Page 7: System Diagram

    SYSTEM DIAGRAM 1 warranty. Mounting your amplifier inside an enclosure is not a good idea unless the enclosure is equipped with ventilation fans to circulate fresh air through the enclosure. Basic Triamp System: 2 Channel Three-Way Your new D7 amplifier features adjustable mounting flanges. Should they need D7 six channel amplifier to be moved to a different location, remove the self-tapping screws on the Channels 1/2 Highpass to a pair of tweeters...
  • Page 8: Installation

    SYSTEM DIAGRAM 2 INSTALLATION TOOLS NEEDED FOR INST ALLATION Biamp System with Dual-Bridged Subwoofers 1/16" Allen Key (Included): Crossover Security Cover Top Screws 3/16" Allen Key: Up to 1/0 AWG Power Rings, Power / Ground D7 six channel amplifier 5/32" Allen Key: Up to 4 AWG Direct Input, Power / Ground Channels 1/2 Highpass to a pair of 1/8"...
  • Page 9: Fuse Recommendations

    CONTINUOUS RMS OUTPUT POWER SYSTEM DIAGRAM 3 Note: Full Rated Power is generated at all voltages between 11 and 16VDC. Four Channel System with Bridged Subwoofer D7056 D7 six channel amplifier 50W x 6 @ 4 Ohm Stereo Front RCA outputs of source unit to 100W x 6 @ 2 Ohm Stereo channels 1/2 Highpass to a component set Rear RCA outputs of source unit to...
  • Page 10: Specifications

    SYSTEM DIAGRAM 4 FEATURES TECHNICAL Four Channel Fully Active System with Subwoofers Symmetrical Topology, Fully Regulated, Triple-Split-Rail Power Supply Isolated Input Section Utilizing “Quasi-Differential” D7 six channel amplifier Instrumentation Amplifier Technology Front RCA outputs of source to Up to 12VRMS Input Signal Voltage Capability (with -12dB Attenuator) channels 1/2 Highpass to tweeters Channel 3/4 INPUT SELECT button “IN”...

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