subwoofer problems

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jkats91

Member - Posts: 22

Joined: October 24, 2010

Posted: February 27, 2011 at 1:12 AM / IP Logged

I have a JL 10W3V3 - 2 ohm ratings subwoofer in a ported box, I have done all the test to make sure it isn't blown i.e: hooked up a voltmeter and measured resistance, steady 2 ohm's and when pushing on the cone I get no harsh scratching noises. But there is something funny, when the woofer is pumping (playing), there is a rattle noise that is coming from it, most likely the cone. Is there anyone that is aware of the issue, or has had previous experience with this subwoofer

lspker

Silver - Posts: 503

Joined: November 23, 2003

Location: Canada

Posted: February 27, 2011 at 1:29 AM / IP Logged

Could be a few things, something rubbing, something lose under dust cap, torn spider, air leak around flange, magnet loose, or my personnel favorite voice ciol detached from forms. Start by good inspection, shake it, and check lead wires.....if bad they could give static sound.

jkats91

Member - Posts: 22

Joined: October 24, 2010

Posted: February 27, 2011 at 1:35 AM / IP Logged

lead wires are fine, when shaken no sound is heard and again i reiterate that w/the voltmeter resistance is stable at 2 ohm's, could it just be a defective woofer that needs to be replaced all together or is it a quick fix? There is no way that it is blown....??

i am an idiot

Platinum - Posts: 13,672

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: February 27, 2011 at 5:51 AM / IP Logged

Sounds like it is blown to me.

Quickly yet gently tap the center of the cone, do you hear the same rattle that you hear when it is playing?

jkats91

Member - Posts: 22

Joined: October 24, 2010

Posted: February 27, 2011 at 9:14 AM / IP Logged

I did exactly as you said and the rattle doesn't exist it's just a normal thump..?

i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: February 27, 2011 at 11:07 AM / IP Logged

Try it in a different box and connected to a different amplifier. If it still rattles in both situations, it is blown.

jkats91

Member - Posts: 22

Joined: October 24, 2010

Posted: February 27, 2011 at 1:36 PM / IP Logged

i have connected it to a different amplifier and newer box and even had it connected to the amplifier w/out a box, and still the same rattle, even though it isn't "technically" blown is there a problem with the cone?

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: February 27, 2011 at 1:43 PM / IP Logged

jkats91 wrote:

As said above, it is blown. Most likely what you're hearing is the voice coil rattling around and it has come unglued from the former. This is a symptom of either defective woofer or of over power or over heating most likely due to clipping.

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i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: February 27, 2011 at 3:54 PM / IP Logged

Technically, It is blown. It does not have an open voice coil, nor is the pole piece rubbing on the magnet, but it is blown.

jkats91

Member - Posts: 22

Joined: October 24, 2010

Posted: February 27, 2011 at 7:04 PM / IP Logged

thank you guys for all of your committed time, effort and help to these forums!

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