Trying to simulate 4th Order Bandpass...little help needed please

[audfrknaveen]

Hi All,

I am trying to simulate 4th order bandpass for a 10" driver using Bass Box 6Pro.

I am unclear about three parameters. (please see the attached images)
1. SYSTEM DAMPING FACTOR (DF)
2. SYSTEM TOTAL Q (Q't)
3. VENT LOSSES (QLv)

Are there any ideal values for SYSTEM DAMPING FACTOR and SYSTEM TOTAL Q? Are those variables to keep changing and trying different response graphs?

Any maximum and minimum limits for those? Do they depend on driver TS parameters? Can any one throw some light please....

Secondly, assuming the overall enclosure is perfectly sealed without any losses, what should be the value of VENT LOSSES?

Thanks a lot for any help...
Regards
AudfrkNaveen

 

[Inductor]

Hi, I don't use Bass Box 6Pro, maybe someone can help you there.
I don't know how that info is introduced in the software.
Maybe in the meantime you can read some of the links on the parameters.
1. Loss by absorption of the enclosure (Qa=35) 2. Loss by leak (Ql=10) 3. Friction in the vent (Qp=70) as they are mostly used for a first simulation. Regards.
Least squares estimation of vented-box parameters Qa,Qp,Ql,h,alpha
Bass reflex alignments explained – Step by step – Audio Judgement

 

[audfrknaveen]

well.... this may not be the right method to go ahead ....
But I build it without much of calculations.
My friend built it with 22"x12"x12" overall enclosure size, and said the result was good ...
He used 1:1 ratio of sealed and vented volumes ....

I built it with 1.5:1 ratio for vented and sealed volumes.
And the idea is to do trail and error tuning on port length.
(testing not done yet .... please see the attached pics )