I'm going to build a Isobarik-push/pull design. Using 2 tempest drivers. The applicable specs off Adire's web page are as follows: Qtc .38, Fs 19hz, Vas 317L = 11.2 cu.ft.
Thomas you had mentioned a Qtc of .5 as a good starting place for high quality bass, so that's where I started, then after doing some calculations (assuming Fc = 25) I came up with an F3 of 27.8hz, and a Vb of 15.3 cu.ft.
The F3 is alittle high for a pure sub...I do want it to pack a punch down low, so I tried a Qtc of .707
Assuming Fc = 35.4, my new F3 is 17.7hz...does this seem right? and my Vb drops to 4.6 cu.ft.??? NO way I must be doing something wrong...the only thing I can figure is my Vas conversion is wrong. I'm assuming I was supposed to convert Liters to cubic feet?
The only other reasoning I can come up with is that .707 is a "universal code"...think about it .707 is also the RMS point of a sign wave! :B and it seems that number has come up in other math related items that I've studied, but none come to mind right now...maybe not.
Anyway assuring my F3 calc's are right, is .707 a good option for tight-well defined bass down to approx 20hz?
AND...is that Vb right???
Thomas you had mentioned a Qtc of .5 as a good starting place for high quality bass, so that's where I started, then after doing some calculations (assuming Fc = 25) I came up with an F3 of 27.8hz, and a Vb of 15.3 cu.ft.
The F3 is alittle high for a pure sub...I do want it to pack a punch down low, so I tried a Qtc of .707
Assuming Fc = 35.4, my new F3 is 17.7hz...does this seem right? and my Vb drops to 4.6 cu.ft.??? NO way I must be doing something wrong...the only thing I can figure is my Vas conversion is wrong. I'm assuming I was supposed to convert Liters to cubic feet?
The only other reasoning I can come up with is that .707 is a "universal code"...think about it .707 is also the RMS point of a sign wave! :B and it seems that number has come up in other math related items that I've studied, but none come to mind right now...maybe not.
Anyway assuring my F3 calc's are right, is .707 a good option for tight-well defined bass down to approx 20hz?
AND...is that Vb right???
Comment