DVC sub, one coil to amp, other coil to a variable resistor?
 

Well I read about this long ago, am now wondering if anybody is doing this.

Take a DVC sub and power one coil normally with the amp, but then take a variable resistor (not sure of value/wattage) and wire it to the second coil. This will make the sub "tighter" if I remember correctly.... anybody know about this? :dunno:

no.... I would remember that kind of insanity

Alright I am getting Googles help here...... certainly took me long enough to find anything! Ill post it here so you can see what I am talking about.

http://www.adireaudio.com/Files/RDOOperation.pdf

Will not work for me considering I have a ported box, Sealed or infinite baffle only.

Doesn't seem practical... but did learn something.

Why a variable resistor? why not just pick a fixed value?.

If only one coil is hooked to the amp, it doesnt matter what you do with the other coil, you should be able to dead short the fu#cker and it wouldnt matter, its not hooked to anything.

Or am i missing something? like parasitic inductance/capacitance etc.

The second coil is actually producing current when the cone is moving. If you put a small load on it it will slow the cone down a bit, if you put a large load on it will slow the cone down a lot. That's what I understand from this in the simplest terms.

I find it interesting, brilliant and idiotic

interesting since it is a way to actively alter the performance of a driver that is not prone to behavior modification

This is brilliant in that it is a great way to adjust damping and the overall Q on the fly & you can alter resonance points of the driver

it is idiotic in that it ADDS distortion and it is my opinion that buying the right driver with a good operational characteristics is a better way of doing this

still it could make the wrong driver behave acceptably with reduced efficiency and increased distortion