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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.
CROSSOVER CONTROLS: CH 1/2
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.
2.
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.
3.
Turn up the amplifier gain until audible distortion starts. Turn down
the gain to the point JUST BELOW the start of the distortion.
4.
Repeat step 3 for all amplifiers in your system.
Please refer to the Diamond Audio Level Setting Technical Brief available from
the Tech Department for a comprehensive level setting procedure.
12
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
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.
AUX. X-OVER INPUT
These RCA jacks allow you independent access to the AUX. X-OVER.
X-OVER INPUT SELECT
Pushing this button “IN” routes signals from the CH 1/2 INPUTS to the inputs
of the AUX. X-OVER. Pushing this button “OUT” allows independent access
to the AUX. X-OVER.
AUX. X-OVER OUT
These RCA outputs are used to provide filtered or unfiltered signals to an
outboard processor or amplifier.
By pushing the X-OVER INPUT SELECT button to the “IN” position, and
pushing the LOWPASS ON/OFF and HIGHPASS ON/OFF crossover buttons
to the “OUT” position, signals available at the CH 1/2 INPUTS will bypass
the crossover and be made available at the AUX. X-OVER OUTPUT RCAs
allowing you to “daisy-chain” multiple D7 amplifiers for the ultimate in system
design flexibility (see block diagram page 16).
D7152 and D7402 manual #135.p65
8/30/2002, 2:25 PM
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