zapco Reference 1000.4, User Manual

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20
The ZAPCO Crossover
All ZAPCO Reference series amplifiers have electronic crossovers
built in. This allows you to build multi-amp systems without the need for
added electronic crossovers. Rather than use the standard, on/off, fixed
frequency crossover usually found on amplifiers, ZAPCO has chosen to use
completely variable crossovers, which can be set for high pass, low pass, or
full range use.
The “FREQ Hz” control allows the user to choose exactly what
crossover frequency the amp will use. In the example above, the crossover
is set at 95Hz and is set for high pass. Some of the Reference amplifiers
have a range switch as well. By pushing the range switch “in” this will
activate the X10 position, you will change the active range from 55Hz-550Hz
to 550Hz-5.5kHz.
All Reference Series amplifiers use “State Variable” crossover
design, to provide the most versatility, with the least effect on signal phase.
Some of the Reference Series amplifiers have multiple crossovers
or special crossover controls for specific uses. These will be covered in the
sections on these special amplifiers.