the plot shows extrapolation off small signal, not actual large signal, which will be a little less. as the cone move toward its limits, the bl field is less, so the sensitivity goes down.
the plot doesn't show any rolloff in signal chain. first order high pass around 5-8hz wouldn't be the worst 'guess' for many systems.
winisd is pretty good. just keep in mind that it is a model with limitations.
the inuke amps aren't going to output the marketing power. the 3000dsp will output around 2000 watts into 4 ohms or about 1000 watts into each channel at 2 ohms. that is probably the one that you want for a 4 driver 4 ohm per driver i.b.
Depends on the alignment too, there's many quasi IBs around. In addition to normal subs in my room, I've got a quad set of these in full IB with an attic backspace ... and they don't need much power (that's the beauty and inherent superiority).
I've powered these so many different ways experimenting, currently I'm config'd at 225w per driver with good results. I want bullet-proof no high-pass operation though.
They're rated at [email protected], but I've found 500w apiece is too much with HT material (full bandwidth LFE)
I'd suggest anywhere around 300w-400w for no worry operation, 400w-500w being careful.
Maybe explore an INuke with prudent setting of the limiter. I always thought a pair of EP2000s and four channels of 4ohm power would be nice too.
I've got 4-15"s in addition to the quad 18 IB, so operation on the ragged edge is no longer a concern.
The version I own is pre-redesign, the newest have a back-plate that's bumped a bit more than mine.
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