Battery And Charging System; Passive Crossovers - Rockford Fosgate POWER 650 MOSFET Owner's Manual

instance, if one wanted to drive the system as two completely
independent stereo amplifiers, one would need to drive the high
channel pair with one stereo signal pair, and the low channel
with another as in using an active fader.
The input mode switch (located near the crossover controls on
the units front panel) switches the low channel inputs to the
RCA female connectors. The low-frequency crossover remains
in the circuit and can be used as usual.

BATTERY AND CHARGING SYSTEM

The Power 650 MOSFET amplifier draws enough current to put
a substantial additional demand on automotive electrical
systems. When played very loudly, the 650 MOSFET may draw
20 to 40 Amperes on the average, with peak demands up to 120
Amperes!
A typical stock battery and alternator in good condition will
handle moderate to low average levels, with occasional brief
episodes of hard use. However, alternator and battery life will be
shortened. We strongly recommend that a premium deep-cycle
battery and heavy-duty alternator be used with 650 MOSFET
systems.
If the sound system will be used when the car is not running, the
battery will obviously be discharged - perhaps enough to
prevent restarting. The discharge/recharge cycle will reduce
battery life, and alternator life will be shorter because of the
high-current recharge requirements.
If problems arise:
a) Use a premium battery or deep-discharge marine battery.
b) Use a heavy duty alternator.
c) Use a trickle-charger or battery charger.
d) Install a second battery for the amp, with a switching
system for recharge.

Passive Crossovers

Passive crossover systems for the 650 MOSFET amplifier
should always use high-current chokes (inductors) and 50-Volt
minimum non-polarized capacitors.
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