punch vs BL factor or force factor ?

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That's great news

what is the displacement of a 12" driver with an Xmax of 5mm.

http://www.diyaudio.com/forums/multi-way/5668-volume-displacement-spl-chart.html#post55867

shows the inch units (imperial) for displacement for 50Hz and 110dB to be about 15 to 20 cub inches.
the next post shows the centimetre units (SI).

I would expect a single 12" driver to get pretty close to your SPL target.

I told you not to guess.

I can't make heads or tales from that chart, but if you say one 12 inch unit is enough, than using 2 per will give me 6 db headroom. Thanks !!
 
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