Have you tried "doping" your speaker cones?

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.

Sean, I've not only got my drivers "hooked" on doping, but I've got myself hooked at the same time. It really worked exactly as I thought. Great fine-tuning tweek. Only adds a few grains of weight, but alot of stiffening. About the whizzer cone mods, mine don't have any, but I've heard of 2 mods for them. They both are aimed at reducing the whizzer cone's propensity to vibrate out-of-control at the unsupported outer edge. This is the cause of the upper mid anomaly commonly known as "Lowther Shout", and some "tizzly" high end effects. One mod uses fiber glass insulation material, the other uses lamb's wool. In either case, a small amount of material is gently tucked in and lightly glued between the back of the whizzer cone and the main cone. All the way around. The idea being to support and damp the whizzer cone without adding any more mass than absolutely necessary. I have not tried this myself, and the Lowther people don't recommend it, but I have read many posts and articles that said it helped. This idea could be tried on any whizzer cone driver that is exhibiting peaky and irritating upper mids and highs. And if you don't like it you can take it out. That "glue stick" like kids use in school is good for temporary testing purposes. Albert - I guess this mod is how to get the "whiz" out of the whizzer!