just noticed a low frequency hum on my sub. hums even if i disconnect the subwoofer cable. if i touch the imputs with my finger, the hum diminishes slightly. the volume and crossover settings have no effect on the hum. if i turn the phase control to 0, (all the way to the left), the hum gets louder. if i turn it to 180 degrees, the hum gets much lower in volume (but still there). I changed the power cable with no change. cant be a ground loop since it does it even when disconnected from the sub cable.
please help, this is driving me nuts, do i need a new plate amp?
i use a parts express 250W plate amp (the one without the bass boost i believe) if this helps