How do I stop humming noise coming from the powered speakers RTi 100. When speakers are played with out built-in subwoofers, the humming is not there but when built-in subwoofer is turned ON, the humm

SOURCE: subwoofer

Most AV receivers do not have a built in amplifier block to drive a subwoofer, and merely provide the subwoofer output channel at line voltage. Thus, a powered subwoofer is required. Does the subwoofer require mains power? From your description, I'm guessing it doesn't. If not, it does not have a buit in amplifier, you will need to purchase a monoblock amplifier, which is just a mono amplifier with a volume control, no tone controls or anything else. Make sure that the amplifier power rating is as close as possible to the subwoofer power rating, as it is quite possible to blow a speaker by using an amplifier whose power output is too low, by overdriving the amplifier , and putting DC through the voice coil when the amplifier clips. If it does require mains power, it will have an amplifier built in, but does not have line level inputs.

SOURCE: My Polk PSW 303 subwoofer emits a hum when plugged

Hiya sounds alot like there is a power supply issue with the unit that will require repair for it to be doing off or on. Probably wont be to expensive, request a quote first to make sure viable.

Best of luck

SOURCE: No sound comes out of the subwoofer. Sound passes

this may be a dumb question but have you turned up the signal. there should be a dial on the back that you can turn the power up. power light on, signal passing threw, the only other thing it can be is the built in amp itself may be dead.

SOURCE: polk audion psw250 subwoofer has humming noise

Humming noise on your sound is not due to your speaker but it is come from the amplifier. I've encountered a lot of this problem that is caused by the electrolytic capacitor. If you are a technician first locate for a dry joints on the board and then resolder it using your soldering iron and a high quality soldering lead. Resolder not only the capacitor but also around the output I.C.
If nothing happen then it is coming from your output I.C. sometimes it was leaky/shorted which produces a humming noise but first do the the above mentioned instructions before isolating the defective output i.c.

SOURCE: I have my Polk Audio

HI, I have the same problem with a MINX subwoofer, can any one help.