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Old 24th August 2013, 01:09 PM   #1
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Default My poor 7s

A few months back I accidentally gave the cone of one of my Alpairs a bit of a bump during installation. The cone ended up with a bit of a crease and a slight indent but seemed to be purely cosmetic.

I've been noticing lately a fairly loud buzz coming from that speaker at specific frequency and low and behold the cone is starting to split along one of the creases!

Is it safe to say this driver is pooped? I was debating putting a dab of nail polish on the back side of the cone over the split to slow it down and or stop it from buzzing. Perhaps I should just toss it in trash.

It's a sad day
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Last edited by Robertburchell; 24th August 2013 at 01:11 PM.
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Old 24th August 2013, 01:49 PM   #2
Mooly is offline Mooly  United Kingdom
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I suspect something more flexible might be better long term. PVA type glue or impact adhesive (rubbery and flexible) applied to the rear of the cone. Whether it will cure the buzzing though...
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Old 24th August 2013, 04:47 PM   #3
Lerg is offline Lerg  Canada
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I would imagine that any adhesive applied to the cone will throw off the weight and balance of the cone since they are extremely light weight.

I would suspect that it is dead.
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Old 24th August 2013, 05:19 PM   #4
chrisb is offline chrisb  Canada
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See if you can contact Mark directly - repairs may be possible, but premature application of inappropriate materials or process can almost guarantee failure.

Lerg is certainly right the weight of these cones - if repairs are possible, I'd think you'd want to carefully apply balancing amounts of material in a consistent pattern - on both cones.

Say, I know a guy who sometimes paints cones....
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Last edited by chrisb; 24th August 2013 at 05:23 PM. Reason: keytsroke errosr ( aka "Davish")
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Old 24th August 2013, 07:39 PM   #5
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I have certainly "binned" cones with less damage. The latest an Alpair10.2 i dropped the Allen Key on.

dave
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Old 25th August 2013, 10:39 PM   #6
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I going to take a gander and say that this driver, while usable at moderate volumes now will be headed to the trash bin in the not distant future.

I suppose the next question is, save for the arrestor, is the Alp 7a different mechanically or electrically? If I purchased a 7a to replace this bummed 7, provided proper burn-in is provided, should these mate up well? Or am I looking at a new pair 7a's?

Thanks for the input folks!
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Old 26th August 2013, 08:45 AM   #7
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Same as the original 7.3 other than the arrestor to the best of my knowledge.
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Old 26th August 2013, 04:54 PM   #8
chrisb is offline chrisb  Canada
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IINM, the arrestor is not part of the active drive train, so there should be no measurable / noticeable difference until overdriven?
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Old 26th August 2013, 06:01 PM   #9
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Right.
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