Zapco AG Reference-series - Manual (Page 66)

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Reference 650.6 Special Features
The Reference 650.6 is a six-channel amp, which ZAPCO has
designed to function as a full and complete high-end stereo system in a
single chassis. At first glance, the controls that allow so many functions from
a single amp can be a little daunting. Therefore, we will look at the controls
in three sections. Channels 1 / 2 (front), Channels 3 / 4 (rear), and the Bass
Channels 5 / 6.
The controls on the far left operate channels 1 and 2. The first
unique function to set is the Source Select. You have the option, with the
650.6, of using a single (2 CH) input for the entire system (Main/Bass input),
or using separate inputs for each section (6 CH.). You may also use just the
front and rear inputs, and let the bass amp automatically grab all the bass
information from the other channels (2 CH w/Bass). See the system diagram
section for examples.
This section of the 650.6 has two separate crossovers available.
The two crossovers allow channels 1 / 2 to be used in a band pass
configuration as well as high pass, low pass, or full range. The first three
X/O controls will be used for normal crossover setups as described in the
controls section (page 19). The next two controls come into play only if you
set the BAND PASS control to ON. When you do that, the next two controls
set the top end (low pass) of your band pass crossover. For example: You
set the left hand FREQ Hz to 85 Hz and X1 and High, then you set the right
hand FREQ Hz to 200Hz and X1 and switch the BAND PASS to ON. Now
the high pass gives everything over 85Hz and the low pass gives everything
under 200Hz. You now have a “band” of frequencies from 85Hz to 200Hz.
This allows the 650.6 to send a “band” of frequencies to a mid-range or mid-
bass, in a three-way or four-way system.