2x beta 12" cab help

Second, the Delta 12 has a rather short Xmax, so probably won't be too happy running as low as 90Hz (if you want to get to full power at least), sorry. Always to your modelling and research before buying drivers.

Thirdly, although WinISD will suggest a large box in order to keep the response flat to as low a frequency as possible, you don't have to stick with that. Assuming you'll use a DSP to give your crossovers, you'll have the option of applying EQ as well, so you would be able to use a much smaller box and then EQ it to be flat enough over the range you're planning.

Fourthly, you definitely don't need to worry about staying within hundredths of a dB as referenced in the output you quoted - no-one can hear differences that small. Even experienced listeners in a good environment typically can hear differences of about 1dB, and less experienced listeners in ordinary environments (ie typical punter at a gig) may only start to notice things when the difference approaches 3dB.

HTH,

David.

OK, so it's the Beta you're using?

Your thread title and first line of the post still say Delta.

Here's a pair of Beta 12's in 60l tuned to 60 Hz with one high pass filter and one EQ applied. The green curve in the background is a theoretically perfect 24dB Butterworth crossover at 90Hz - so with just the one EQ you can get within 1dB of that.

This still only takes a couple of hundred watts to reach 4.4mm excursion, but does allow the pair of drivers to get to around 127dB at that level.

Edit - clearer image