Diamond Audio HEX400.2 Owner's Manual - Page 9

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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!