Replacing woofers/foam in Bang and Olufsen speakers

camshaft · 7th April 2007, 04:16 AM

Hey Guys,
I have a pair of b&o cx100's that came along from the seller with an older receiver I wanted. The woofers have foam rot, which is very common with this model, especially ones over 12 years old like mine. I could just refoam them myself at $8 a pair, but I was curious about the possibility of fitting in new woofers. The problem is, the woofers are 10cm with square flanges, and I'm having a tough time finding 10cm woofers let alone ones with square flanges (they aren't those rounded off square ones you often see). The only woofer so far I've found that looks like it might fit is a 4" goldwood on parts express, but at only $7.20 each I'm not sure they'd sound any better than just refoaming the originals even if they did fit. So do you guys have any suggestions?

I'm including 2 pics of the speakers so you can see the woofers.

Thanks,
Austin

camshaft · 7th April 2007, 04:33 AM

Ok, think the pic might have been too big to load maybe...

trying again.

camshaft · 7th April 2007, 04:38 AM

Hmm, I just noticed there's a 4" Audax woofer on parts express that doesnt have the right shape flange, but the specs are identical to the b&o speaker - 6ohm and min freq. of 64 Hz. I wonder if it's basically that woofer but with a different flange. I see on Madisound there are two other 4" Audax drivers that look like they have that square flange shape.

http://www.madisound.com/pdf/audax/hm100z2.pdf

camshaft · 10th April 2007, 05:46 AM

Are square flanged 4" drivers really that rare? I thought someone on hear would know some companies that make them.

Austin

sreten · 10th April 2007, 01:13 PM

Hi,

Generally the higher the quality of a speaker the more you must
use the original drivers, so refoaming seems the only proper option.

If you didn't like the speakers in the first place, then depending
on the internal crossover complexity new drivers are possible.

/sreten.

camshaft · 10th April 2007, 05:57 PM

Thanks for the reply Sreten! I actually really like the way they sound even with the foam missing, as I think they sound better than my Infinity Primus HT speakers. Since many speaker builders on here wouldn't consider this a high quality speaker but just an overpriced one, I thought they might be able to suggest a drop-in replacement driver that might sound even better. Nevertheless I have ordered the foams and am waiting for them in the mail.

Austin

7th April 2007, 04:16 AM	#1
camshaft diyAudio Member Join Date: Dec 2006	Replacing woofers/foam in Bang and Olufsen speakers Hey Guys, I have a pair of b&o cx100's that came along from the seller with an older receiver I wanted. The woofers have foam rot, which is very common with this model, especially ones over 12 years old like mine. I could just refoam them myself at $8 a pair, but I was curious about the possibility of fitting in new woofers. The problem is, the woofers are 10cm with square flanges, and I'm having a tough time finding 10cm woofers let alone ones with square flanges (they aren't those rounded off square ones you often see). The only woofer so far I've found that looks like it might fit is a 4" goldwood on parts express, but at only $7.20 each I'm not sure they'd sound any better than just refoaming the originals even if they did fit. So do you guys have any suggestions? I'm including 2 pics of the speakers so you can see the woofers. Thanks, Austin

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7th April 2007, 04:38 AM	#3
camshaft diyAudio Member Join Date: Dec 2006	Hmm, I just noticed there's a 4" Audax woofer on parts express that doesnt have the right shape flange, but the specs are identical to the b&o speaker - 6ohm and min freq. of 64 Hz. I wonder if it's basically that woofer but with a different flange. I see on Madisound there are two other 4" Audax drivers that look like they have that square flange shape. http://www.madisound.com/pdf/audax/hm100z2.pdf

10th April 2007, 05:46 AM	#4
camshaft diyAudio Member Join Date: Dec 2006	Are square flanged 4" drivers really that rare? I thought someone on hear would know some companies that make them. Austin

10th April 2007, 01:13 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Generally the higher the quality of a speaker the more you must use the original drivers, so refoaming seems the only proper option. If you didn't like the speakers in the first place, then depending on the internal crossover complexity new drivers are possible. /sreten.

10th April 2007, 05:57 PM	#6
camshaft diyAudio Member Join Date: Dec 2006	Thanks for the reply Sreten! I actually really like the way they sound even with the foam missing, as I think they sound better than my Infinity Primus HT speakers. Since many speaker builders on here wouldn't consider this a high quality speaker but just an overpriced one, I thought they might be able to suggest a drop-in replacement driver that might sound even better. Nevertheless I have ordered the foams and am waiting for them in the mail. Austin

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