Steve Snow

Thanks for all of the welcomes and repair tips. Sorry I have been busy with other things haven't had a chance to check back on this board.(One of them being repairing an old Franklin Ace computer) Now I can get back to working on the sub. So far I have only replaced the two 2200 uf capacitors. That seems to have gotten rid of the hum. But now when I try to drive it with an audio signal I only get loud pops every now and then. I'm going to read through the tips that wrf posted. The sub appears to be in good physical condition and I would say I am the first one to have opened it since it was new. Like wrf suggested, I think I'll start replacing all of the low voltage caps.

Hello All, I have owned a Sunfire HRS-8 Sub for about 4 years. I was so impressed with it's performance that when a Sunfire True Subwoofer MKIV came up for sale on the Goodwill auction site I had to take a chance on it. Unfortunately when I plugged it in it has a very loud hum. After spending some time searching the internet for repair help I came across this site. I already have several of the electrolytic caps on order. But I have not had much luck finding a schematic for this beast. I would very much appreciate any help from anyone that has gone down this road before.