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Puff Goes the Sunfire Mk II Subwoofer

Every now and then (and I have not yet discerned a pattern), my sunfire MK II subwoofer makes a soft but very noticeable puff sound. The sound is similar to the thump that you would hear unplugging a heavily amped subwoofer from the wall, but not as loud. My first thought was that I must have a bum cable, but I swapped out the cable and still have the problem. I am running a Sunfire Theater Grand II pre/pro. I also have a nasty ground loop problem which I solved (without any problems until now) with an Entech humbuster box in line between the pre and the sub. The ground effect is coming in from a dirty RF signal from my cable TV provider. I am also using two star-clustered Richard Gray Power Company 400s units which I have all of my stuff plugged into (pre/pro, Sunfire Cinema Grand amp, sub, Kenwood 5900M CD/DVD, Scientific Atlanta Explorer 2100 cable box, Sharpvision 34N-WF5H TV). The problem started when I added the Richard Grays but I don't see how the problem would be related; it seems like a coincidence. Hu-Hu-Hu Help!
rdmillerrd

Showing 2 responses by sean

sean
6,231 posts
 
Are all of your powered components plugged into the same circuit / outlet ?

Did you try any of the steps outlined in a post about AC polarity / hum / noise that was posted a few weeks back ?

As to being a coincidence with the Richard Gray pieces, try pulling them out and see if the problem goes away. If it does, get rid of them. When an electronic product makes unexpected or unexplainable noises, it is a "cry for help". It might be a minor problem, it might not. The only way to tell would be to either take steps to correct it or wait it out and see... Sean
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sean
6,231 posts
 
Derrick, i can see it now. Your standing at the podium testifying against a whole CITY full of cell phone users trying to explain how they are bad for your high fidelity gear. Only on "Court TV" : )

Out of curiousity, have you guys tried changing power cords and interconnects ? If the power cords are attached, what about adding ferrite chokes as close to the amp as possible ? You might also want to try this if you have a "sense" wire that remotely turns the sub on from your pre or processor. Since that wire is probably pretty scrawny, you might want to try making several loops through the ferrite to improve the efficiency.

Just a thought and hope it helps... Sean
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