Originally Posted by DVA
I was not thinking the white noise was coming from the speakers. I am just wondering if anyone else has experianced this whith Harmon Kardon receivers?
I have had white noise problems in car-audio systems before. In each case, it was something in the signal before reaching the speakers. One time, it was the sub-woofer dedicated amplifier (feedback to the other amps on the power supply side?). Another time, a digital EQ that converted the analog to digital, processed it, then converted back to analog. In competitor's cars, I have seen where poor wiring location caused various noises, but not what I would describe as hiss.
In your case, the search for the cause will be easy.
- Turn on the receiver, no active source, and with the volume turned all the way down. Do you hear the identical hiss you have been describing?
- If not, increase the volume, does the hiss start?
- If not, you have a problem with one of your sources or the wires going to them.
- Try different sources, and see which ones have problems with hiss. Also test to see if the hiss occurs with the volume turned all the way off.
- If you could hear the hiss with no source in the first test, move your receiver and the speaker to another location (or just to the middle of the room) away from all your other equipment
- Using a short raw wire, hook the speaker to the receiver.
- Turn on the receiver, but with the volume turned all the way down. Do you hear the identical hiss?
- If you do, use one of the other speakers. If you hear the same hiss again, it is coming from your amplifier.
- Last thing to check, if there is no hiss with the receiver and speaker pulled away from the other equipment, but is there with the other equipment hooked up. You have a problem with you wiring, or a rogue device plugged in but not the active source. Start removing components, one at a time, and see which is the culprit. It may be as simple as a large loop of wire sitting on a transformer.