Question about Sony SA-WX700 Subwoofer

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My sony sa-wx700 after being on for only short time gets this wind blowing sound.i've unplugged the cable from the reciever and iy still does it. it seems to be internal to the subwoofer.i've also unplugged it from thw wall outlet. then plugged it back in and it goes away. but then comes back after few minutes. any idea what is wrong with it.

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A connection that goes bad when it warms up or the amp part of it is going bad....

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Direct from Sony:

c860 is Part # 113616400 $2.14
r830 is Part # 121284900 $2.14

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