u/Macky10

Hi.
I am trying to build a full range vented cabinet consisting of a compression tweeter and 12" woofer.
I have the B&C 12NDL-76 drivers.
On the B&C website, the suggested cabinet size is 42l with a tuning of 65Hz

When i use the TS parameters in any online calculator, it comes back with a suggested 6L closed or 10-11L ported
I cannot get a decent response curve from anything close to 42L

Can anyone advise me what i may be doing wrong please?

B&C 12NDL-76:

Fs 50 Hz
Qes 0.21
Qts 0.2
Sd 522 cm² (80.9 in²)
Xmax 7 mm
Mms 53 g
Le 1 mH
Re 5.3 Ω
Qms 4.2
Vas 73 dm³ (2.5 ft³)
η0 4.3 %
Xvar 6.5 mm
Bl 20.1 Tm
EBP 238 Hz