Tacky/Sticky Woofer?

[lakedmb]

Out of curiosity, how come the woofers on the M5jr+'s have a tacky/sticky feel to them?

Is there any benefit from this or by chance a trend of some sort? At first, I thought that the previous owner had done something, but after seeing this come up at a few other places I came to the conclusion that it must have been applied during production.

Thanks!

[comfortablycurt]

I'm not sure why they have the tacky texture, it is normal though. It's just a result of the treatment that was found to work best on the paper cones I'd imagine.

[lakedmb]

Thanks for the response. I'm glad that it isn't a defect.

[treitz3]

No, be rest assured that it is not a defect.

[F1nut]

It's called a doped paper cone offering an improved performance over plain paper cones. Many, including myself, believe that doped paper cones are still the best, presenting a natural tone/sound.

[lakedmb]

I agree, this is one of the better sounding budget speakers I have ever heard.

Are doped paper cones still used today?

[Face]

I believe so: http://www.madisound.com/catalog/product_info.php?cPath=45_228_256&products_id=789

[nooshinjohn]

Damn those look awfully close to the real deal

[comfortablycurt]

I've seen quite a few car subwoofers that have the same type of texture on the cones. So, it is still used today. They definitely have a very natural sounding tone...I love the way these vintage Polk's sound.:D

[Ron Temple]

Danny Ritchie is still using doped paper on his designs. They aren't tacky, but the same basic idea.

[F1nut]

Yeah, they are still around. Also, seems that the DIY crowd likes to dope their plain paper drivers.

[OldmanSRS]

Zig-Zag cone drivers.

[gdb]

A while ago...I asked about coatings for speaker cones on the PE forum and got some advice from some "hardcore" DIY speaker builders. I never bothered to mess with the Advents anyway, I just bought some Monitor 10s for outdoor duties. Gotta love butyl surrounds when you have better things to do than re-foaming old woofers !!:)

http://techtalk.parts-express.com/showthread.php?t=205614

[Face]

Zig-Zag cone drivers.

http://www.madisound.com/catalog/product_info.php?products_id=1479