messed up sub for free... diagnosis of problem?

[skylineTT 10+ year member]

my buddy gave me a "blown" CVX for free. i havnt tested the coils with a DMM yet but threw a 7.2V battery on each coil and they popped up fine with no resistance or scratching. when i connect it to a 500w amp and play music, itll sound just fine until it exceeds about a centimeter of excursion, then it sounds "boingy" hah. i know 500 watts isnt much but i wouldnt expect it to sound that way after testing many other subs that sounded fine.

ill test the coils later to make sure they read near 4 ohms but has anyone else experienced this or know what it is off the top of their head? thanks

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[ThatChevyGuy 5,000+ posts]

torn spider?

 

[Stephen_c 10+ year member]

broken glue joint?

 

[skylineTT 10+ year member]

nahh the spider looks and feels great

 

[skylineTT 10+ year member]

nothin?

 

[chithead81 10+ year member]

Never heard "boingy" as a description before. Anything loose around the magnet or tinsel leads?

 

[jco1385 5,000+ posts]

unwinding coil

 

[nismos14 5,000+ posts]

It's blown.

 

[skylineTT 10+ year member]

lol checked the tensils and they are secure and nothing is loose at all. idk how the coil is but thats a possibility. has nobody heard this noise?

 

[cheeto 10+ year member]

I had a 12" w3 awhile back for my first sub, never clipped it or anything like that. The same thing happened to me. When you tap on the cone, it makes a boingy sound just like that... you can also hear it at low volumes. Made a few threads on here and never got to what actually happened unfortunately

 

[groundpound4200 5,000+ posts]

i have a CompVR in my garage that does the same thing. It does a good job of keeping my box plans from blowing away.

 

[jesterjames 10+ year member]

well one of you 3 take the sub apart so we know what it is

 

[skylineTT 10+ year member]

tested it again today and it seems to only make the sound when the sub is faced up.. when held sideways, it makes no irregular noise to be heard free-air.