Zapco AG Reference-series - Manual (Page 36)

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Reference 750.2 Special Features
In addition to the standard Reference Series features, the 750.2 has
an auxiliary crossover output. This second crossover has all the features of
the internal crossover but operates on the aux output, rather than the
750.2’s own amplifier. This gives the user the option of cascading
crossovers in multi-amp systems and even allows band passing an amp
(see the system diagram section).
Power Requirements
The Reference Series 650.6, 750.2, 1000.4 and 1100.1 amplifiers
are all extremely powerful and require special care in installation. With these
large, high power amplifiers you will also want to preserve the performance
and reliability of your vehicle when making modifications to your electrical
system.
Even though the Reference Series amplifiers are very efficient, it
takes a lot of current to produce a lot of power. You should follow, carefully,
the minimum wire size for power and ground in the chart on page 13. Also,
your high power amplifier will be the single highest current draw item in your
vehicle. If you want high volume over long periods time, you should discuss
electrical upgrades with your installer. You may need capacitors, extra
batteries, or even an upgraded alternator. Every installation is different and
the time to consider these upgrades is during the system design phase. The
performance of the product is dictated by the quality of installation.