is my sub blown?

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spmpdr

Copper - Posts: 456

Joined: March 22, 2009

Location: Oregon, United States

Posted: May 14, 2009 at 1:30 AM / IP Logged

my question is this can a sub be blown but not look blown, i.e. no tears,rubbber surround is fine etc. it is a memphis 12 250 watts rms . i run a pair of these hooked up to a 500 watt rms memphis monoblock. the speaker sounds good but has a brrrb to it if that helps any , sorry couldnt think of better sound fx. its sounds like it has a rip in it or something but it doesnt i have looked over the sub completely more than once. any suggestions?

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tommy...

Gold - Posts: 1,901

Joined: December 10, 2004

Location: United States

Posted: May 14, 2009 at 6:59 AM / IP Logged

Sounds like the voice coil...Errrrrrrr...take sub out of box ...In rare instances the wire{usually on dvc's} could be touching speaker. not a great way to check ...But put even pressure on the woofer and press in ...Hear the noise? this is not a normal way to check b/c if you are un-evenly pressing on the woofer, will hear the noise anyway...!

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: May 14, 2009 at 10:05 AM / IP Logged

A speaker being "blown" has nothing to do with a torn surround or damaged cone. As was alluded to above, I bet your voice coil has come loose from the former, either due to over heating (is your amplifier clipping?) or due to a manufacturing defect.

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spmpdr

Copper - Posts: 456

Joined: March 22, 2009

Location: Oregon, United States

Posted: May 14, 2009 at 12:15 PM / IP Logged

I do not know if the sub is over heating, the amp is not cliping,if i am not mistaken cliping means cutting out correct? the amp isnt overheating. how can i tell if the sub is over heating?

-A vision without a plan is just a hallucination-

spmpdr

Copper - Posts: 456

Joined: March 22, 2009

Location: Oregon, United States

Posted: May 14, 2009 at 12:17 PM / IP Logged

is there a way to fix the voice coil issue?

-A vision without a plan is just a hallucination-

tommy...

Gold - Posts: 1,901

Joined: December 10, 2004

Location: United States

Posted: May 14, 2009 at 12:23 PM / IP Logged

did you take sub out...did you push on it...?????????????????????????

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spmpdr

Copper - Posts: 456

Joined: March 22, 2009

Location: Oregon, United States

Posted: May 14, 2009 at 12:27 PM / IP Logged

no i havent been able to do that yet, thanks though i will try when i get home

-A vision without a plan is just a hallucination-

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: May 14, 2009 at 12:47 PM / IP Logged

No, clipping does not mean cutting out. Clipping means the amplifier is cutting off the tops of the music waveform, outputting a near-DC signal at much higher power than it's normal rating. This is usually caused by improper gain setting and can destroy a loudspeaker voice coil. I bet your gain is not set properly, and/or you are using bass boost or some other EQ on the signal. Or it could simply be that your amplifier is capable of much higher power than your speaker can handle.

The only way to repair your speaker is to have it re-coned.

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spmpdr

Copper - Posts: 456

Joined: March 22, 2009

Location: Oregon, United States

Posted: May 14, 2009 at 1:17 PM / IP Logged

the amp is 500 watt rms matched to 2 memphis 12s 250 watts rms, wich is what memphis suggested. I dont know if my gains are set properly , there is no bass boost feature on my h/u it does have a loud on/off though. Could not having enough airspce in my box i.e. creating to much pressure / heat cause this problem. how can i know if my amp is clipping? what will it sound like in lamens terms. by the way thanks for the education dhyon, . is reconing expensive ?

-A vision without a plan is just a hallucination-

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: May 14, 2009 at 1:23 PM / IP Logged

Here's a discussion on setting gains: https://www.the12volt.com/installbay/forum_posts.asp~TID~85479~PN~1 You might also want to read through the other threads in the Hot Topics section. The cost for reconing a speaker varies from one to the next and some cannot be done because parts are simply not available. I do not know if Memphis speakers can be reconed, or if it's cheaper to simply replace them. Reconing a subwoofer usually costs around $100.

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