Resistor to change Qts of 12 inch driver - diyAudio
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Old 26th May 2007, 02:19 AM   #1
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Join Date: Jun 2002
Location: 3RS
Default Resistor to change Qts of 12 inch driver

I decided to try out the effect of resistors in series with my Peerless 831857 woofer.

I used 0.5 ohm and 1.0 ohm. I didn't try larger resistors because I don't like to loose too much power in the resistor.
Note that the difference when the resistor went up from 0.5 to 1.0 ohm was not so great .

driver : Peerless 831857 ( run in for 10 hours at 30 Hz )
Rdc = 5.6 ohms. Fs 32.6 Hz

Measurement made at one end of woofer terminal and free end of resistor.

R in series Qms Qes Qts

0 ohms 4.92 0.76 0.66
0.5 ohms 5.41 0.88 0.76
1.0 ohms 5.26 0.92 0.78

So looks like 1 ohm is the best option for increasing Q for use in an open baffle. Possibly there will be no audible difference between 0.5 ohm and 1.0 ohm resistors(?).

Can anyone run a simulation in a U frame 14x14x20 inches ?
My memory is short. I can't remember what software is available that can do this. Can someone jog my memory ?
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