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
Doesn't adding extra mass increase Qms??
I have added extra mass to lower Fs, at the expense of lower SPL so need to increase the number of woofers
I have added extra mass to lower Fs, at the expense of lower SPL so need to increase the number of woofers
Added mass increases Qes as well as Qms to the same degree. That is, adding mass doesn't change Qms/Qes. Ron E and I think others have posted replies here explaining this.
-Pete
-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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