"in that test thread the guy doing the testing said the amp shut down on him when he was testing it in 4 ohm stereo at max output . maybe i missed something cause i didnt finish reading the entire thread"
yeah. a little knowledge can be dangerous.
that was a sine wave into 4 ohms both channels
driven to shutdown.
in the real world, speakers have impedance,
which means the resistance varies based on the
the only point where impedance gets close to
resistance for most subwoofers is either very,
very, low--something like 10hz--or at the tuning
frequency in a ported cab.
so it is only those instances where the sub
will be pulling maximum current through the power
supply, which is what caused the shutdown in
the first place.