Have you tried "doping" your speaker cones?

Twl,Damar varnish is not brand name,but a type of varnish typicaly used by artists who paint with oils. It would be available from an art supply store like "Daniel Smith" out of Seattle or from a company that makes art supplies like Windsor Newton.

I should mention that the main reason I tried it was to tame a small peak in the upper midrange and to take a little "edge" off the highs that was causing sibilance. You should try one thin coat at a time,let dry, and listen test. You can go too far with this and it can "deaden" the highs, if you are not careful. With woofers and mids, though, I think there is less risk of going too far,because of their lower frequency nature. It really stiffens the cone and creates better piston type action and reduces any cone breakup modes you may have. I should add that this is for paper cones only.

Everbody talks about light moving mass but many speaker manufaturers modify the drivers they use by adding damping material. An older Dalquast(sp) Moniter had some sort of putty on the front of the woofer. someone was marketing a doping mod for Mission 707s. One of the most highly rated speakers today use a "damping ring"(my term) applied to the back of magnesium mid-woofers.

Twl, how could you do that ? What you did is both illegal and immoral. This is not to mention that you might have even gotten your drivers "hooked". For shame, for shame...

Actually, i've heard many positives about doing something like that. I can see how it could help in reducing cone break-up, flexing and distortion. As you mentioned, i think that it is most beneficial in the upper mids and treble.

Out of curiosity, does the driver that you are using have a whizzer cone and if you've done anything to work with that ? Sean
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Strange Sean, usually whizzer comes after too much alcohol, not dope.