Hello all,
I picked up a Rumble 500 combo last month and have been thoroughly enjoying. However, when playing quietly at night, I've been noticing a quiet hiss coming through the the horn and two woofers. Upon further investigation, I noticed that this hiss is present even without any instrument or cable plugged into the input. Without any input to the amp, the hiss increases in volume with increased gain on either channel. It is generally quiet, but ever since having noticed it, I've found it hard to ignore and have been concerned that I may have gotten a dud.
Can any fellow owners of the 500 combo test their units with no input to the amp, gain 10, volume 10? At this setting (while extreme, yes) the static coming out of the speakers, especially the horn, is most apparent. Without any input to the combo, should I expect silence except for the fan noise? Thanks!