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#143955 - 07/21/06 10:31 PM VP150 Dome of tweeter pushed in - Suggestions?
in2deep Offline
newbie

Registered: 05/06/06
Posts: 2
Just got home to find out my nephew and niece were left alone in my theater room and decided to see how fun it was to push in the cone on both tweeters on my VP150. Any suggestions on what I should do? Will it affect my overall sound? Could I make it worse by tring to fix it?

I found the following online....Is it a lost cause?

Technical Editor Hugh Robjohns replies: I'm afraid to say that if a soft-dome tweeter has been pushed in, it will already be creased, and that will result in increased distortion compared with an original unit. This structural damage cannot be repaired, although you can improve the looks of the thing by drawing the tweeter dome back out.

Whether you can hear this damage or not depends on several factors, not the least being the quality of the original tweeter. For some, repairing the looks of the tweeter will be sufficient, but the only real way to get the original performance back is to replace the tweeter, and ideally the one in the other speaker too, so that they both will be the same age and have the same specifications. It's best to approach the speaker manufacturer directly for replacements, quoting the serial numbers of your speakers, so that they can check their production records and supply new tweeters of the correct sensitivity. This is often something that varies from batch to batch and so the speaker crossovers have to be tweaked slightly during manufacture to maintain correct overall performance.

If you can't replace the tweeter, then you might be able to restore its shape and some of its original performance. Bear in mind, though, that the coating on the tweeter dome is delicate, and trying to pull it out by sticking tape or Blu-Tac to it is a daft idea in my opinion. Such techniques will either pull off parts of the coating (making the situation even worse) or leave residues behind (ditto).

A better way of restoring the shape of the dome is to use a vacuum cleaner, because it is a non-contact approach. This is what we did to provide a temporary fix for a damaged tweeter in a Studio SOS visit in the October 2002 issue [www.soundonsound.com/sos/Oct02/articles/studiosos1002.asp]. By carefully reducing the air pressure in front of the tweeter using the hose from the vacuum, the pressure of air behind the tweeter forces its shape back out in a fairly gentle way. Obviously, it involves a strong and steady hand to avoid the vacuum cleaner nozzle coming into contact with the tweeter in any way, but, provided that you are careful, this technique can be effective.



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#143956 - 07/21/06 11:35 PM Re: VP150 Dome of tweeter pushed in - Suggestions? [Re: in2deep]
Wid Offline
axiomite

Registered: 06/22/03
Posts: 6722
Loc: The Peoples Republic of Il.

Looks to me it would be time to give the mother of said nephew and niece a bill for two new tweeters.
_________________________
Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud


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#143957 - 07/22/06 12:24 AM Re: VP150 Dome of tweeter pushed in - Suggestions? [Re: Wid]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17792
Loc: NoVA
Try calling Axiom, see what they'll do for you.
_________________________
I am the Doctor, and THIS... is my SPOON!

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#143958 - 07/22/06 10:26 AM Re: VP150 Dome of tweeter pushed in - Suggestions? [Re: in2deep]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5433
Loc: Bowmanville, Ontario, Canada
Ouch. How did they get to the tweeter cones -- did they poke through the little covers somehow ?

Lots of people get the dust covers on the woofer/midrange speakers poked in and consensus seems to be that the sound is not really affected if you pull 'em back out with tape or vacuum cleaner, but I have to think that a poked in tweeter will be more of a problem.

Definitely give Axiom a buzz and see what they recommend.


Edited by bridgman (07/22/06 10:31 AM)

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#143959 - 07/22/06 11:15 AM Re: VP150 Dome of tweeter pushed in - Suggestions? [Re: bridgman]
in2deep Offline
newbie

Registered: 05/06/06
Posts: 2
You guessed it. The little fingers went right through the little covers. If you look at the covers, the dome is seperate into 4 sections. Not sure that it matters that only the top section of the dome was pushed in rather that all four sections.

In my head there will always be an issue with the highs not being as smmoth even if technically there isn't.

I e-mailed JC from Axoim to get his thoughts. I guess I'll be finding out how much 2 tweeters are going to run me.

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