Kef B139 Woofer Problem??

Zero Cool · 23rd November 2011, 12:54 AM

I have a Kef B139 woofer in original box that has a number of problems..i think.

It appears to be in working condition but when looking at the spider, it appears to be sunk in, but the surround and flat cone are even with the frame and would otherwise look like i think it should look like.

Looking at how the spider is mounted. it appears to be correct so I'm curious if this is supposed to be this way?

If i gently press on the back side of the cone until the spider is flat, the flat center of the cone is extended past the edge of the frame quite a bit?

Anyone have knowledge of these??

The other is a slight flaw from when someone cut the box open and scratched the cone pretty good. But that's cosmetic only.

Zc

AllenB · 23rd November 2011, 12:59 AM

Are you able to drive it with a clean sinewave, pick it up with a microphone and compare that to your drive signal to show 2nd order HD?

Zero Cool · 23rd November 2011, 01:01 AM

I have not tried to drive it with an audio signal. But i did pop it with a battery and it seems to work ok. no scraps odd noises.

23rd November 2011, 12:54 AM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	Kef B139 Woofer Problem?? I have a Kef B139 woofer in original box that has a number of problems..i think. It appears to be in working condition but when looking at the spider, it appears to be sunk in, but the surround and flat cone are even with the frame and would otherwise look like i think it should look like. Looking at how the spider is mounted. it appears to be correct so I'm curious if this is supposed to be this way? If i gently press on the back side of the cone until the spider is flat, the flat center of the cone is extended past the edge of the frame quite a bit? Anyone have knowledge of these?? The other is a slight flaw from when someone cut the box open and scratched the cone pretty good. But that's cosmetic only. Zc __________________ It's not about what you can BUY...It's about what you can BUILD!

23rd November 2011, 01:01 AM	#3
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	I have not tried to drive it with an audio signal. But i did pop it with a battery and it seems to work ok. no scraps odd noises. __________________ It's not about what you can BUY...It's about what you can BUILD!

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23rd November 2011, 12:59 AM	#2
AllenB diyAudio Member Join Date: Oct 2008	Are you able to drive it with a clean sinewave, pick it up with a microphone and compare that to your drive signal to show 2nd order HD?

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