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
I retraced the calculation of QB3 alignment based on filter theory.
The filter coefficiants are given by:
An externally hosted image should be here but it was not working when we last tested it.
The frequency response of a vented enclosure is given by:
An externally hosted image should be here but it was not working when we last tested it.
The requirement for QB3 alignment is given by:
An externally hosted image should be here but it was not working when we last tested it.
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:
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
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
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".
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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