LarryA

I'll second that! After living with "the hum" for years, one of my KSP-400 sub amps recently quit working entirely. Thanks, EdmondGTP, for the guidance to set up a stand alone sub amp. I think it's the right solution. I purchased a Dayton SA1000 subwoofer amp for $400 and a couple of speaker terminals for $8 through PartsExpress dot com. The sub amp drives both 15" subs with tighter, cleaner bass than I ever had with the original built-in amps. Also, I used 1/8" plywood to replace the old heat sink, easier to me to work with than the metal. Initially, I was concerned about the resale value of the speakers with such a major mod until I noticed the KSP400 speakers on Ebay for several hundred bucks. In other words, they are fully depreciated. Oh, and one more thing. I didn't bother storing my old amps in the closet. They went directly into the trash... Speakers sound better than ever. Thanks again, EdmundGTP!