Speaker Fusing; Internal Fusing - Rockford Fosgate POWER 650 MOSFET Owner's Manual

frequency, a given midrange driver will handle 2040% more
system power. The same improvement would result from going
from a 6dB/Octave
Tweeters will react the same as midranges to changes in the
frequency and slope of their crossovers: the higher the
frequency and the greater the slope, the more power the tweeter
will handle. In view of the high power capacity of the 650
MOSFET, it is likely that all but the most rugged tweeters will
require more than a simple single-capacitor crossover. Twelve-
dB-per-Octave or even 18-dB-per Octave passive crossovers
will help typical tweeters to survive. (See "Passive Crossovers"
section of this booklet.)

SPEAKER FUSING

The Power 650 MOSFET is provided with in-line fuses for
speaker protection. These fuses should always be fast blow types
and should be selected on the basis of the speaker's power
handling capacity. Three Ampere type AGC (3AG) fast-blow
fuses are provided as standard.
The speaker fuses are not required to protect the 650 MOSFET
power amplifier and may be eliminated if desired. However,
speaker fuses of 6 Amperes or less will avoid the inconvenience
of replacing internal fuses in case of a speaker or wiring short.
IT SHOULD BE NOTED THAT WHEN USING ONLY THE
INTERNAL FUSES, THE 650 MOSFET IS CAPABLE OF
DESTROYING VIRTUALLY ANY UNPROTECTED SPEAKER,
DUE TO THE POWER AVAILABLE.

INTERNAL FUSING

The ruggedness of triple paralleled MOSFET devices allows the
elimination of both short-protection shutdown (shortstop) and
Safe Operating Area current limiters, allowing the amp to drive
extremely reactive
Amplifiers are protected by two 7.5 Ampere type AGA (1AG)
fuses per channel. The internal fuses are accessible through a
flush mounted hatch on the mounting side of the amplifier.
Replace internal fuses only with
fast blow fuses. Always disconnect the main power wire (White
8 Gauge) from the battery before removing the fuse access
hatch.
to a 12dB/Octave
loads without distortion
7.5 Ampere type AGA (1AG)
-8-
crossover.
or shutdown.