DefTech BP7000sc knocking sound from sub - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 03-12-2019, 03:25 PM - Thread Starter
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DefTech BP7000sc knocking sound from sub

Hey guys,
bad news for me, my DT started a knocking sound on heavy bass parts....At first I thought it was an imperfection in the source material. I was watching a movie on cable. I soon realized it was my sub.
It was making a knocking sound and then it would cut out.....with no source material I could tap the back of the speaker and tell the power was trying to cut in/out, but the knock noise was the giveaway to something being amiss.
Never had any trouble with these speakers at all. Doing a little research on knocking noises from subs I've read something about "spider webbing" coming loose behind the sub as a possible culprit.
I did pull the cover off and didn't note any visual damage to the outside of the sub speaker.
I have no idea how to pop this thing open for further exam and am a noob at technical diagnostics.
Any advice or ideas?
What should I do?
Thanks guys
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post #2 of 4 Old 03-12-2019, 03:34 PM
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Hello, I have these too and have taken them apart a few times. What I would do is unscrew the amp and take it out as much as you can. Then play the speaker and see if you can locate the part that is making that noise. Be careful.
Also, could it be port noise from having the amp up high?

Last edited by keeper; 03-13-2019 at 03:09 AM.
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post #3 of 4 Old 03-13-2019, 08:19 AM - Thread Starter
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Quote:
Originally Posted by keeper View Post
Hello, I have these too and have taken them apart a few times. What I would do is unscrew the amp and take it out as much as you can. Then play the speaker and see if you can locate the part that is making that noise. Be careful.
Also, could it be port noise from having the amp up high?
No, the amp wasn't up too high.
Is there anyplace in chicagoland that services these amps?
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post #4 of 4 Old 03-13-2019, 08:52 AM - Thread Starter
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Quote:
Originally Posted by mike iuro View Post
No, the amp wasn't up too high.
Is there anyplace in chicagoland that services these amps?
Oops, I mean speakers.
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