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  Lately I've observed closely a behavior of 3Ē general purpose unit (TV sets, multimedia speakers). There was a substantial bump in frequency response from 2-3 kHz. Iíve calculated wave lenghts of this region and found out that they corespond with radiuses of driverís surround. Just to prove my assumptions are correct, Iíve applied strips of insulating tape to smooth transition between a cone and surround. Measurements showed that this tweak works.

This modification is very crude, but when done nicely, it could provide even better results.
Does anybody has an idea how to make this rim in one piece and glue it permanently? It should stick to the surround permanently and be resonably light and flexible.

Red line: fr of nonmodified driver
White line: modified driver