that converter is a piece of crap, But i can tell you this if you still connecting normal speakers and converting the same output, theres your hum, you can't do that, if the converter is working, heres what you do i've done this a thousand times and it works great!
take your front left speaker wire and rear left speaker wire, connect the positive of the rear to the negative of the front, then take the remaining positive and negative and connect them to your front left output from your reciever.
next do the same for the right front and right rear and connect them to your right front out.
now connect your left rear out and right rear out to the converter in the specified areas. now rca output to your sub amp. CLEAN as a baby's butt. make sure to crank the gains on the converter wide open, you'll still only see 1-2 preamp volts. now your fader on the radio is also a sub amp remote?! turn it to the front and you amp slowly shuts off, turn it to the rear and your high speakers will quieten while your subs get louder. I know I'm the man. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
