A second identical shorted loudspeaker as passive damped radiator

[mdpaudio]

Pgs 18-20: The Audio Amateur Issue 77 #01 page 1

Amazing that I was doing this without knowing someone else had done this work figuring out all the different circuits that could be used. My use of a dual vc damped the woofer instead of a passive.

 

[Cal Weldon]

Shorting an inductor (motor) will stop it moving or at least heavily dampen its movement.

Which works wonders if you happen to have a cheap 15" long throw sub to go along with a regular 12" woofer. The drone sub might not need need any weight added but what it can do to the woofer if the excursion is not kept under control can be startling to the uninitiated.

It's all in what you're working with.

 

[jjasniew]

Wouldnt it be cool...

- If you could take an amplifier, put in a little output series resistance, monitor the signal across it, feed it back to the input through a band pass filter - and make its output impedance a function of frequency.

Do that with a class D amp with DSP; you could make your passive speaker's damping be a function of frequency. Tune it to how you like in software...

/Wouldnt it be cool...