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Lbjefferies7 wrote:

If you are really interested in moronizing your room, GTT Audio & Video are selling some Kharma Class-D's on audiogon. http://www.audiogon.com/cgi-bin/cls.pl?ddampstran&1237509628&demo&3&4& Looks like they are trying to sell them before they go in the trash...They are in New Jersey and are probably open to negotiation.

Do they come with a jar of Vaseline? Well, if Bill sells it and TAS approved it then it shell be a true crap. I am very much not a fan of class D amps; in fact I know that they shall not be good. They might works in my case for bass application. It however will definitely not be the Kharma’s off the shelf $50 amps rebranded as a “big name” manufacturer and hyped by marketing the whores. No one “invent” or “design” those class D amps. They are a dose of Asia-made modules and they pretty much all come from the same barrel. If I get a class D amp then it will be $250 max trial investment and if a person tell me that I need to pay more in order to get “better” sound then I would hiss in his face. BTW, if someone knows a good a good $250 around 100W class D amp then let me know.

miab wrote:

I've been following your project with some interest. I've been experimenting with a horn loaded mid bass cabinet and have isolated a resonance around the same 220hz mark you mention. I feel/felt the inadequate cabinet bracing is my problem but you mentioning gasket in the same breath as your resonance has me curious. I have not mounted a gasket between driver and cabinet but maybe I should try? Do you feel the gasket will help by air sealing or for giving a very minute buffer from cabinet? Perhaps even not fully tightening and perhaps playing a tightening tension vs. resonance control?

Miab, I can’t be certain as my experience in those speakers making is very limited but I think that it is not the enclosure resonance. It is too abrupt to be enclosure. It exist at 223Hz and gone at 237Hz. Also, when I stress the enclosure the resonance is not changing, however when I touch the screws with which I tight the drivers, juts very slightly turn them, than the resonance is gone completely. Well, it is not gone but moves to other frequency, uselessly from 210Hz to 263Hz. So, I have 4 driver 16 screws and I might play with them, juts one of them impact the resonance. I PRESUME that it might be cured by gasketing as my baffle is not wood but G10 is much harder, I was not able to drive screw into it and was forced to pre-drill the holes.

I was looking around and I was not able to found 4.5” gasket, so I think I will use viscosity dumping. A few year back I bought in Home Depot a brick of some kind palmer substance that was made for attaching it to the thin pipe assemblies in order to make the pipe do not buzz.  It feels like a rubbery butter and I used in to mount drivers in past and those techniques were in use in 70s by some manufactures. Let see if it help in my case. If not then it would be more pain in ass but let hope for the best.

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