Magnus Danielson wrote: >> Hej Magnus >> >> Do you mean an active noise cancellation system?? >> > > No, you could do that too, but I was basically refering to a simple box tuned > in size to cancel at 2 kHz. Toss in a thick cloth for additional resistive > damping. > > You could even go Helmholtz if you want. > > Simple passive cancelation. Classical acoustical approach. For 2 kHz it is in > reasnoble sizes. > > Another thing is to put heavy lead-rubber on the metal faces to make them less > of a resonator/radiator. That mod can be done inside the box. > > There are a whole bunch of other tricks. Pressing on the surfaces of the > whining chamber will make it stiffer and provide a higher acoustical > impedance. > Pressing using rubber blocks, from say silicon rubber, is known to work. > > Cheers, > Magnus > > Hej Magnus
Its a pity that the old rho-c impedance matched high dissipation rubber method only works under water. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
