8
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.
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 fully-
independent crossover for the output RCA jacks providing filter control of
any other amplifier.
13
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.
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.
