Crossover System - Rockford Fosgate Power 360 Installation Manual

tweeter's impedance falls to well under 1 ohm within the
bandwidth of the amplifier. This low capacitive impedance can
upset the amplifier's compensation scheme and cause ultra-
sonic (inaudible) oscillations, overheating or damaging the
amplifier.
A simple method of preventing problems is to be sure there is at
least 6 feet of speaker lead between the amplifier and the piezo.
All amplifiers are tested with piezo loads and 6 feet of lead,
they will have no problem.
Another method of taming the piezo is to insert a 1- to 10-ohm
resistor in series with one of its leads.

CROSSOVER SYSTEM

The Power 650 and Power 360 incorporate separate high- and
low-frequency crossovers, which are controlled by screwdriver-
slot switches on one end of the power amplifier. The crossover
frequency is set to one of five frequencies or to flat response,
depending on
The crossover is a two-pole (12 dB/Octave) constant-power
design with
designed for an accurate phase match between low- and high-
frequency outputs (within 5 degrees) to eliminate cancellation
and lobing errors.
High Frequency
Crossover
Position
1
2
3
4
5
6
speaker and
a Butterworth
Frequency
Flat
100 Hz
Hz
250
Hz
600
1500 Hz
4000 Hz
system characteristics.
transfer characteristic.
Low Frequency
Position
1
2
3
4
5
6
-9-
Outputs
Crossover
Frequency
Flat
100 Hz
250 Hz
600 Hz
1500 Hz
4000 Hz
and
are