Speaker Impedance; Speaker Wire - Rockford Fosgate Power 360 Installation Manual

Triamplifying; that is, using another active crossover and stereo
amplifier to run the tweeters only, is technically interesting but
less cost-effective. For one thing, there is little or no masking
effect from the very high frequencies for midrange distortion, so
the biggest performance advantage of multiple-amp systems
isn't available. Crossover components for passive midrange-to-
tweeter crossovers are reasonably small and inexpensive.
Running a separate tweeter amp system will prevent tweeter
burnout due to heavy midrange clipping, and this is the most
substantial advantage
SPEAKER
The Power 650 is designed for a 2-ohm nominal minimum
impedance on each of its four channels. (Two 4-ohm speakers
in parallel form a 2-ohm load.)
The Power 360 is designed for a 4-ohm nominal minimum
impedance on each of its four channels.
In bridged mode (two amplifier channels driving a single load),
each channel "sees" half of the load impedance. Therefore the
Power 650's minimum load impedance in bridged mode is 4-
ohms, and the Power 360's minimum is 8-ohms.
If an output wire from the amplifier shorts, or if the load
impedance drops below safe minimums, the amplifier will go
into short protection mode. In "shortstop" the amplifier will turn
off for several seconds every time it senses an overload.

SPEAKER WIRE

We recommend that you always use substantial wire for speaker
wiring harnesses. For short runs,
we suggest; for runs over 6 feet, at least
used.
Never allow any speaker wire to touch chassis ground. Many
users find that sound quality is improved by the use of specially-
made heavy-duty speaker wiring from one of several manu-
facturers. The Power 650 and 360 output harnesses use short
runs of 16-Gauge wire and should not reduce any benefits
gained from
of
IMPEDANCE
specialized speaker
triamplified systems.
18-Gauge wire
18-Gauge wire
wiring.
-7-
is the smallest
16-Gauge should be
16-Gauge