FUSE
FUSE
HEAD UNIT
(perferredly with 5V output)
DE400.4 SIGNAL ENDPLATE
DE400.4 POWER/SPEAKER ENDPLATE
Battery
ESC
VIEW
BAND
SOURCE
AUDIO
MUTE
FUNC
TAG
9
8
SYSTEM CONFIGURATIONS
SET UP
PreAmp out
FRONT
PreAmp out
REAR
Placing the x-over switch in the FULL position sets the amplifier to Full Range. This setting allows ALL frequencies to pass
to the speakers. Placing the switch in the HPF or LPF position activates the 12dB crossover. When the switch is set to
HPF(High-Pass) or LPF (Low-Pass) the crossover adjustable is from 50-250 Hz (40-250 LPF on DE900.5D).
Placing the switch in the HPF position sets the amplifier to the High Pass Filter mode, enabling frequencies above the
cutoff point to pass. For a full range speaker system begin tuning with the frequency set between 50Hz and 80Hz.
Placing the switch in the LPF position sets the amplifier to the Low Pass Filter mode, enabling frequencies below the
cutoff point to pass. For a subwoofer system begin tuning with the frequency set between 60Hz and 100Hz.
To adjust the gain setting, turn the amplifier gains all the way down (counterclockwise). If using a remote level control
plug the level control into the amplifier and turn it to the “MAX” position. Next turn the source unit volume up to almost
full volume (usually about 2/3rds of the way up) or until the output starts to distort on an oscilloscope. This will be
NEARLY full volume on most source units, perhaps one or two “clicks” down from maximum volume. Next, increase the
amplifier gain setting until adequate volume is achieved, or until distortion is audible and then turn it down a bit until the
distortion is inaudible.
NOTE:
Ideal signal to noise and dynamic range are achieved with the gain at minimum (5V setting). Most users find adequate
gain and volume is achieved at less than halfway in the adjustment range. Avoid setting the amplifier gain very high as
noise and distortion will increase significantly. For a more in depth level setting (gain adjustment procedure),visit the
Diamond Audio website.
The HPF or LPF crossover adjustment can now be fine tuned. If you are using the amplifier in a HPF configuration and
would like the system to be a little bit louder you can increase the HP Filter frequency and reset the “Gain” of the
amplifier. Raising the HPF frequency up to high however will cause a loss of mid range and bass. If you are using the
amplifier in a HPF filter configuration and you hear voice or vocals coming from your subwoofer system you can turn the
LPF filter frequency down (lower).
After setting the input gain adjustment and crossover, you may choose to add a small amount of “Bass EQ” in the low
frequency region. Remember that the Bass EQ feature will not fix a poorly designed subwoofer enclosure or subwoofers
that didn’t sound good to begin with. Tuning below 32Hz (on your sub enclosure) is a BAD idea! Lower is NOT always
better!!
1. Make sure any bass EQ or low frequency equalization from the source unit is set to OFF or FLAT.
2. While playing the same musical selections used during the gain setting process, slowly increase the level of the Bass
EQ. You should be able to notice a obvious change between 0 and +18dB. If you do not notice much difference, then
it will not serve any benefit to increase the boost further.
3. If the boost has audible benefits without adding appreciable distortion, find a level that suits your taste. Remember:
it’s much easier to construct the right subwoofer enclosure for your listening preferences than relying on a bass boost
control to do the job!
DE400.4 - Typical 4 channel Setup
with 4 speakers
