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Could you check my calculations to see if I have done this properly? Thank you very much.
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Yep, if you take exactly what WinISD recommends and use 1000watts as input power into the two coils in series, and add a usual electronic rolloff filter at 10Hz with a 1st order, it looks pretty good.
The dip in SPL will theoretically be boosted by room gain, so that seems good.
The velocity only goes to ~20m/sec at full power at 12.7Hz, which is only 5.8% speed of sound. In a 10inch port, my understanding is that will not make noise.
The excursion peaks at 10Hz with full power applied. The 27 xmax is the linear max and not the Xmech. From reading, the 38mm at 10Hz seems acceptable. I don't know the Xmech of that driver. Others might.
Again, I'm no expert. I just learned by reading about subwoofer construction since I knew so little about it.
The experts can comment....
SPL_bug.jpg VELOCITY_bug.jpg EXCURSION_bug.jpg
brucek