Vented enclosure design - SBB4 calculations
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 25th April 2012, 03:04 PM #1 Andre42   diyAudio Member   Join Date: Apr 2012 Vented enclosure design - SBB4 calculations My search is on the mathematical specification of the SBB4 alignment. I retraced the calculation of QB3 alignment based on filter theory. The filter coefficiants are given by: The frequency response of a vented enclosure is given by: The requirement for QB3 alignment is given by: For given TS parameter (F_s, V_as, Q_ts) and assumed leakage (Q_L) the corresponding coefficiants and the associated B can be calculated. I inserted those calculations in a little Excel sheet. Of course the resulting box volume and Helmholtz frequency are calculated too. Now I would like to calculate the SBB4 alignment, but I can't find a mathematical definition in the web. Help is much appreciated. Andre Last edited by Andre42; 27th April 2012 at 06:22 AM. Reason: visibility of images
 26th April 2012, 03:13 AM #2 Ron E   diyAudio Member     Join Date: Jun 2002 Location: USA, MN I've never found one. I did a curve fit of one not sure if it is SBB4 or BB4? A=Qts*5.05-0.153 B=0.264*Qts^-1.59 Vb=A*Qts*Vas F3=B*Fs Fb=Fs I think this is Ql=7 __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 27th April 2012, 06:19 AM #3 Andre42   diyAudio Member   Join Date: Apr 2012 In David Weems book " Designing, Building, and Testing your own Speaker System" there is a chart for SSB4 but no calculation. Your formula might match this chart - I will check. Weems also mentioned that SSB4 alignment is from Robert Bullock. So my next step is to look into Robert Bullock's papers, which can be bought as "Bullock on Boxes".

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