Software to estimate F3 in ZRT design

[xyrium]

Hi All,

I'm considering doing a 2 way ZRT in a sealed cabinet. What I'd really like to achieve is an F3 about about 50hz. Is there software/freeware out there that I can use to estimate what the F3 would be for this design in a 20 and 30l cabinet?

Also, if the sealed design doesn't get me to 50Hz, I was considering a 30l cabinet and going ported. In that case, what software could I use to calculate the port size and tuning?

Sorry, I'm new to this in some ways, and with the price tag of these drivers, I don't want to screw it up.

BTW, this will be a nearfield design, so I'd front mount the port if I have to go ported to get 50Hz at -3dB.

Thanks!
Paul

[Jed]

Unibox is very accurate.

[xyrium]

Edit: Ok, I entered all of the parameters available from Scanspeak, and I'm getting several errors during the calculation because some of the data is incomplete (divide by 0, etc.). Can someone else run the calcs on this driver using a 28.5l vented box? Actually, I want to use PE boxes of either .999 ft³ (28.29l), or 1.010 ft³ (28.6l).

Here's what I get using 28.5l:

Design by Vb, Fb and Q
Physical Vb 28.5 l
Absorption, Qa 80
Leakage, Ql 15
Port, Qp 80
Alpha, a 2.035
Vb 29.0 l
Fb 40.28 Hz
F3 38.02 Hz
Response peak 2.89 dB
Peak at 58.08 Hz
Port min dia. 6.82 cm
Port length 43.01 cm
Port 1. resonance 358 Hz


The parameters I used for the driver are:

Fs 28.50 Hz
Re 5.80 Ohm
Qms 5.10
Qes 0.39
Sd 150.0 cm2
Vas 59.0 l
Xmax peak 6.50 mm
(Le) 0.35 mH
(Le2) 0.00 mH
(Re2) 0.00 Ohm
Nominal Power 70.0 W