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Would a different Danley amp than the suggested 20k4 work? (10k4?)
Trying to save money, ~10k on acoustics and ~10k on sound (amp/speaker alone) is a good chunk of money. I'd really love to stick with Danley amps & black box presets - but the 20k4 seems like a giant waste of an amp for one speaker.
PLD 4.5 has such bang-for-buck...
If I had to 'roll-my-own' settings what is the recommended HPF & crossover?
The 10K would give you 3dB less bass output. So the question is, would you have enough.
Consider that the SM80F has the low freq capability of 3-4 normal 2x18" subs.
So with less power, you would take away 1 of those (give or take) so 2-3 2x18" subs.
So use that as your basis for output.
Something else to consider. Using another amp (since it seems you don't need 4 channels) and use the Danley SC48 processor. It has all the same processing and limiting. You will just need to adjust the limiters for the gain of the particular amp you are using. There is a paper on that.
Regarding DSP settings. Sometimes they transfer between different platforms, other times they are off by QUITE a bit.
I have seen xover freq be almost an octave different. that is HUGE.
I have seen Qs of filters be off by a factor of 2 (twice as wide or half as wide as they should be). I have seen amplitude be off by a couple of dB.
I have also seen them be "dead nuts on". So you must be careful when just sticking in numbers and "hoping" it will be the same.