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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
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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danielk141
489 posts
 
I had a Sunfire Signature sub with the (same?) problem. It was in my living room video system. The sub was very sensitive to any power surges in the room. I eventually ran the sub only on a heavy extension cord to another circuit in another room. I recently sold the sub to a friend who has it in his video on a dedicated circuit - no problems at all. I found the lower you have the level control set on the sub, the sooner it will go to stand by on the "auto on" mode. Then it will stay off until a bass demand triggers it, then the muted "thump".

Daniel
mdomnick
332 posts
 
i agree...try removing the RGPC one at a time to see if you can isolate the potential problem. Please keep us posted on results, as I am curious about RGPC stuff.

Thanks and good luck!!!

m-
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