Unlike mono bridged operation, with Dual Half-Stereo operation, you also have the option of using speaker
loads of 4
Ω
or higher.
For Dual Half-Stereo, simply connect only one channel's input and output of each HCA-600. Leave the
Mono Bridge switch in its Stereo (down) position. Leave the other channel of both amplifiers disconnected.
It doesn't matter which stereo channel you use on each amplifier.
Use Good Speaker Wire
For best results you should never use speaker wire thinner than 16 gauge to avoid constricting the sound
stage and deteriorating bass response. You may also wish to experiment with audiophile-grade speaker wire
and interconnects. Each will have a different characteristic sound and some may be more compatible with
the sonic signature of your various components.
Detachable AC Line Cord
Before you attach the AC cord, make sure the HCA-600 power switch is in its off position.
The HCA-600 includes an audiophile-grade detachable AC cord. We recommend that you use only this cord
and try to make direct connection to the AC wall outlet. Connection to a flimsy extension cord will seriously
impair the sound reproduction of the HCA-600. We do not recommend you connect the amplifier to the
accessory AC outlet on your preamplifier. The current draw exceeds the ratings of most preamplifier's power
switches and power cords and could cause premature failure of the switch, not to mention degradation of the
sound.
If you use an external AC line conditioner/surge suppressor, make sure it can handle the full continuous
required by the amplifier (about 5 amperes). If you want the very best sound possible, you might consider
having a licensed electrician run a dedicated AC power line for your HCA-600. This will isolate it from most
of the power line interference caused by older wiring and household appliances.
While 3 pin grounded AC cords are standard on most high end components, sometimes it becomes neces-
sary to reverse the polarity of the AC plug to reduce hum. In this case, you may use a 3 pin to 2 pin AC plug
adaptor, or "cheater plug," which is readily available at low cost from any hardware store.
If you believe your system has a hum problem, the first step is to reverse the AC plugs of your other compo-
nents, one by one, starting with the preamplifier. In many cases, this will eliminate the problem. If this fails,
it may be necessary to reverse the direction of the HCA-600's AC plug. Please do not cut off its 3rd ground
pin; you may need it again if you change components. The preferable way is to purchase the "cheater" with
only two pins which can insert in either way in the wall outlet. This will not compromise the sound quality
of your system.
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