OK, so I have had this sub for a while. It was a hand me down from a friend due to the humming when ever it is plugged into AC power. The humming noise is there even when the RCA cables are removed, so I have ruled out a ground loop with another device. I have tried it in many different outlets on different circuits and even if different homes. I have sent in the amp to Cerwin Vega for repair and they claim the could not find any issues.

So at ropes end, I am hoping that someone here might have some insight. I am OK at most electonic devices and can do some minor repairs if given instructions on what to do. I am also willing to spend a little money fixing this issue.

I look forward to any advice you have to give.

cheater plug

cheater plug

I appreciate the reply, however if a cheater plug is what I think it is, it will be no help. Is this what is considered a cheater plug?

http://tbn2.google.com/images?q=tbn:AejWRSBgGMfuCM:http://www.enjoythemusic.com/SuperiorAudio/equipment/0107/plug.jpg

The sub only has a 2 prong ungrounded plug already. Could that mean that I need to somehow ground the unit?

And I want to say that I understand that this is an older sub and probably is not the quality that most here would prefer, but I already own it and have no means to afford better gear. I can only lust over the professional gear that others have. So I am forced to fix it instead of replacing it.

Hello. I found this SUB-150 on cragslist. I am thinking about buying it but cant find any info about it on the net. Besides the humming issue do you like the sub? Does it have big boomy bass?

http://stlouis.craigslist.org/ele/1058379410.html

Hello. I found this SUB-150 on cragslist. I am thinking about buying it but cant find any info about it on the net. Besides the humming issue do you like the sub? Does it have big boomy bass?

http://stlouis.craigslist.org/ele/1058379410.html

Yes. It is a very powerful sub. I have never turned it up to the point of clipping before, but at moderate volumes, it has knocked pictures off of shelves 10 feet away. I have to be careful that I don't disturb my neighbors. My house and their house is only about 20 feet apart. The bass would be easily heard in their house at half volume.

Thats great. I had a cls-12. Is this better? Is the $250 price tag a good deal?

Thats great. I had a cls-12. Is this better? Is the $250 price tag a good deal?

I have no clue about that other unit. I would say that for $250, it better not have the noise issue mine has. If it is in good working order, I would gladly pay $250 for it though.

Okay thanks. One last question. Which of the 2 subs do you think would be better? Not sure if you are familiar with this model or not. Its a klipsch ksw-10

http://stlouis.craigslist.org/ele/1029510651.html

I looked up humming issues and found this page to be informative. Hope it helps! Thanks for your help!

http://www.polkaudio.com/forums/showthread.php?t=59518