slot resonators vs "typical" bass traps

[SAC]

...just realize that many of the slotted formulas published in common texts are incorrect.

[mikahanau]

...just realize that many of the slotted formulas published in common texts are incorrect.

Yes, mouthcorrection is not fixed,it is diefferent for all the frequencys
I never see a formular in the web with this bug fix

[SAC]

I am referring to the formula in Everest and also Ballou and on quite a few websites. It is incorrect.

fo=2160 x sqrt (r/(dxD)+(r+w))) is incorrect.

Use: fo = 2160 x sqrt(r/((d*1.2*D)*(r+w)))

You want to modify the effective length of the 'neck' to (1.2 x the neck length)...