Zapco AG Reference-series - Manual (Page 38)

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Reference Series Monaural Amp Controls
The Reference Series Mono amplifiers differ from the current Stereo
and Multi-Channel units in few areas.
First, of course, is the output wiring; the 500.1 and 1100.1, are
mono amplifiers, which means they only have one speaker output. Because
these amplifiers will be used primarily to drive woofers, we have given them
high current, heavy-duty terminal blocks.
Secondly, the 500.1 and 1100.1 mono amps are the first of the
Reference Series amplifiers to provide SymbiLink™ balanced line input
only. You will notice that there are no RCA inputs on your 500.1 or 1100.1.
ZAPCO has included the SLDIN-T.F with every amplifier. Simply plug your
head unit or processor into the SLDIN-T.F and run the appropriate length
SymbiLink™ cable to the DIN input of your amplifier.
Also, the diagram above shows some control changes on the mono
amps. These two models have a port for bass boost. The optional DBC
(Dynamic Bass Control) can be plugged into this port for bass equalization
control from the dash.
To protect your speakers, we have designed a new sub-sonic filter.
The filter is a 24dB/octave, high pass that is variable from 15 Hz to 50 Hz,
so you can match the filter to your woofer enclosure.