Does anyone know of a currently-sold woofer with 0.3 > Qes > 0.2 and Qms about 30 times Qes? I need this type of woofer to test a bass extending network.
I've had some success with Pioneer DVC 8" B20FU20-52D with Qes =0.23 and Qms= 4.05. My calculations show that a higher Qms/ Qes ratio will improve the amount of extension possible.
The size of the woofer at this point isn't of concern to me, but I would like to limit the unit cost to maybe $60. or less because I'm not absolutely certain that I can achieve success with it.
A woofer that fits the bill that I can't locate is Pioneer 6-1/2" woofer C16LU20-51F. This woofer has Qes = 0.23 and Qms = 7.63, so Qms/ Qes = 33.
I don't think that it would be easy to modify a woofer to obtain a higher Qms.
Any help is appreciated,
Pete
I've had some success with Pioneer DVC 8" B20FU20-52D with Qes =0.23 and Qms= 4.05. My calculations show that a higher Qms/ Qes ratio will improve the amount of extension possible.
The size of the woofer at this point isn't of concern to me, but I would like to limit the unit cost to maybe $60. or less because I'm not absolutely certain that I can achieve success with it.
A woofer that fits the bill that I can't locate is Pioneer 6-1/2" woofer C16LU20-51F. This woofer has Qes = 0.23 and Qms = 7.63, so Qms/ Qes = 33.
I don't think that it would be easy to modify a woofer to obtain a higher Qms.
Any help is appreciated,
Pete
Can't say I agree with this. I seem to remember reading more than one bench test of this experiment (adding mass and taking measurements) and the Qms is the most affected parameter , IIRC .
The selection is slim with a $60 price limit.
MCM Audio Select 8'' High Excursion Woofer - 120W RMS 4ohm | 55-2421 (552421) | MCM Audio Select
..................................Blake
That MCM55-2421 looks to be very similar if not identical to the Tang Band W8-740P. I bought and tested the Tang Band and was disappointed to find maximum impedance at free air resonance Fs much lower than it should be. That is,
Zmax = (Qms*Re/Qes) + Re.
If you want to see what Ron E had to say about adding mass, look at the thread entitled "altering T/S parameters?" at diyaudio.com.
Thanks,
Pete
Zmax = (Qms*Re/Qes) + Re.
If you want to see what Ron E had to say about adding mass, look at the thread entitled "altering T/S parameters?" at diyaudio.com.
Thanks,
Pete
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