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#335918 - 01/27/11 11:43 PM M80 woofer(s) problem....
RickF Offline
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Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
I am getting static, distortion, crackling or whatever one wants to call the unwanted noises coming from both woofers from one of my 5.5 year old M80s. My wife and I noticed the static noises coming from the M80 a couple of nights ago while watching a movie and I told her it was probably just bad mixing but tonight I noticed the same noise while listening to David Gilmour's 'Remember That Night' BR DVD, changed DVD's and the noise persisted, switched out the M80 with one of my M60s and the noise disappeared, switch back to the M80 and the noise again persisted so I switched that M80 with the other M80 and the static was back.

Definitely the M80 ... not the source, not the amp, AVR, BR player or my imagination.

My question is (like it really eff'n matters), bad crossovers, bad woofers or just a bad M80? I'm thinking bad M80 because several months ago I had a tweeter in the very same M80 shatter like apparently nobody has ever seen...



Anything else I need to check, anything I need to do, look at or any other suggestions?
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#335920 - 01/27/11 11:50 PM Re: M80 woofer(s) problem.... [Re: RickF]
ClubNeon Offline
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Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
I'd go with bad crossover, being perhaps the cause of your tweeter problem.
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#335922 - 01/27/11 11:53 PM Re: M80 woofer(s) problem.... [Re: RickF]
Wid Offline
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Registered: 06/22/03
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Loc: The Peoples Republic of Il.

To eliminate the crossover you could swap out the woofers from the good speaker to the offending one. If it persist then it very well could be the crossover.
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#335925 - 01/28/11 12:02 AM Re: M80 woofer(s) problem.... [Re: Wid]
RickF Offline
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Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Do you guys know where the crossover is in the M80? I really don't care to start swapping drivers out with other speakers.

Any other way to check the crossovers?

If it helps, and I think it might, whenever I was checking everything I did switch the crossover on the AVR from my pre-set 60 x-over setting to 80, the noise wasn't as bad but was still there, switched it back to 60 and it was more evident.
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#335926 - 01/28/11 12:03 AM Re: M80 woofer(s) problem.... [Re: Wid]
SirQuack Offline
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Registered: 01/29/04
Posts: 13579
Loc: Iowa
WoW, rick what the heck happened to that tweeter, first time I've seen something like that, I would call Axiom, even though you might be over the warranty, you never know.
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#335927 - 01/28/11 12:06 AM Re: M80 woofer(s) problem.... [Re: RickF]
JohnK Offline
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Registered: 05/11/02
Posts: 10634
Yeah, Rick; I remember the tweeter disaster. Maybe you shouldn't play at 150dB? But more seriously, if you listened from up close and it's definitely coming from both woofers, then it's unlikely that a problem in the wiring in or leading to both drivers occurred simultaneously. If it was one, I'd suspect a loose wire. Since it isn't, then yes, the low frequency section of the crossover is the likely suspect.

Edit: Reading your follow-up comment about changing the crossover to 80Hz, that would just seem to indicate that having the M80 play less bass(and the sub more)made a problem in the M80 more apparent. Try 150Hz to hear what happens.
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#335932 - 01/28/11 12:19 AM Re: M80 woofer(s) problem.... [Re: JohnK]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
I've been really trying to be good John but now that the lil' missus is retired and home most of the time it's a difficult task trying to hold the reins on her listening habits, especially during the John Tesh Radio Hour. I'm trying my very best though.

Consensus suspects, and I agree, bad crossover? Next question is, how difficult or easy is it to replace the crossover in an M80?

Randy that happened several months ago and Axiom rectified the problem, the tweeter looked like a fragmentation grenade explosion.


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#335933 - 01/28/11 12:22 AM Re: M80 woofer(s) problem.... [Re: JohnK]
Ken.C Offline
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Registered: 05/03/03
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Loc: NoVA
I think the crossover's behind the binding posts, but I'm not certain. I do know that replacing it would involve soldering, so hopefully John's right, and it's just a loose wire. A new crossover is (I think) around $130, if you are forced to go that route.
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#335934 - 01/28/11 12:23 AM Re: M80 woofer(s) problem.... [Re: JohnK]
RickF Offline
axiomite

Registered: 02/26/05
Posts: 5210
Loc: Vero Beach, Florida
Originally Posted By: JohnK
Try 150Hz to hear what happens.


I'll go try 150Hz and report back in a few John, thanks.
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#335935 - 01/28/11 12:24 AM Re: M80 woofer(s) problem.... [Re: JohnK]
BlueJays1 Offline
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Registered: 09/19/08
Posts: 4116
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I wonder if a faulty high-pass filter could cause that sort of damage to the tweeter? You have had the M80's for almost 6 years. Crossover components can lose spec or just outright fail over time.
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