CR_Logan

The last few months I have been having some problems with the higher range sounds from my Klipsch 4.1 v.2-400 speaker system. At low volume everything sounds fine but when I crank it up the high notes become very static sounding. So today I decided I was going to figure out the problem or buy some new Logitech Z-5500's. I have had these speaker for over 8 years and people still marvel at the sound of them at my parties so I dont want to spend money to replace them if I dont have to. Here is what I have done so far to trouble shoot the problem. 1. Unhooked the speakers from my home PC and hooked them to my laptop, with the green cable hooked in to my laptop for the two front speakers there were no issues. The sound was great. I played it for about 5 minutes and had no issues at all, except for the amp getting really hot from it being cranked. 2. Then i unplugged the green plug for the front speakers and plugged in the purple plug for the rear speakers into the laptop. The sound was horrible. It was a high pitch hissing sound that was unbearable. I think i know the problem has something to do with the rear channel but have no idea what. 3. Now that I know the problem is not the Home PC or the sound card on the PC I plugged the green cable back into the home PC and played some music. Sound was good, no hissing on the high notes. Then i plugged in the purple plug for the rear speakers and the hissy high notes were back again. I didnt mention this earlier but all four speakers have the hissing sound on the high notes when the rear channel speakers are plugged in. So this eliminated what i though early on, a blown speaker or all four blown. 4. After all this hunting I decided to take some pictures of the CP-1 and the AMP. took the bash amp off and checked connections ... all appeared good ...Checked for loose or cracked resistors, etc... and all look good ...Checked for burnt areas from connections on the circuit boards and no issues that I could find ...see photos below I then took the CP-1 preamp appart and the circuit board has a brownish area on it with all types of goo on it... not sure if this is the way it should look or not ... Here's a pic ... Is this normal? If you have experienced this issue or know how i can resolve it for cheap I would be happy to hear any suggestions. I want to get these babies back to the rockin that I am used to from them.