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Adjustment of Built-In Crossover (All Models)
Placing the switch in the OFF position sets the amplier to Full Range. This setting allows
ALL frequencies to pass to the speakers. (Not available on HA 750.1). Placing the switch in
the ON position activates the crossover.
Placing the switch in the HP position sets the amplier to the High Pass mode, enabling
frequencies above the cutoff point to pass.
Placing the switch in the LP position sets the amplier to the Low Pass mode, enabling
frequencies below the cutoff point to pass.
Turn the crossover adjustment knob all the way down. With the system playing, turn the
crossover adjustment knob up slowly until the desired crossover point is achieved.
Adjustment of the Bass EQ (HA 750.1)
After setting the input gain adjustment and crossover, you may choose to add a small
amount of “boost” in the low frequency region. This bass boost adjustment is FIXED at
45HZ. Remember that the Bass Boost feature will not x a poorly designed subwoofer
enclosure or subwoofers that didn’t sound good to begin with.
1) Make sure any bass EQ or low frequency equalization from the source unit is set to OFF
or FLAT. If you have other outboard signal processors with equalization, you should use
those to add boost rst and leave the amplier’s bass boost alone.
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 demonstrable change
between 0 and +12dB. If you do not notice much difference, then it will not serve any
benet to increase the boost further.
3) If the boost has audible benets without adding appreciable distortion, nd 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!
Remember that the Bass EQ feature has an optional dash mounted control included with the
amplier that will function as an attenuator between the maximum level set at the amplier
and 0dB of attenuation. It will not add boost beyond the level you choose at the amplier.
Troubleshooting
It’s imperative that you read the manual fully to eliminate the possibility of mistakes made from
assumptions about how you “think” the amplier might work versus how it’s recommended
to be installed. If the amplier does not appear to be working, check obvious things rst
such as blown fuses, incorrect wiring congurations, poor or loose connections, crossover,
Bass EQ, and gain controls set incorrectly, etc. These elements are the most common cause
of initial problems, so take your time and double check all of your work before assuming
there’s a serious problem.