AVS Forum Special Member
Join Date: Oct 2010
Location: Somewhere in New Joisey
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4th order BP subs are not ideal for something able to play deep while still being small, primarily because the port length will greatly influence how low they can go. Also, that alignment is good for about 2 octaves max. I was actually exploring one myself, because done properly a BP sub sounds great, but the narrow passband kinda killed it for me.
I was actually looking to try the SI BM mkIV because the sealed chamber portion could be made very small, meaning more of the cabinet volume could be use for the ported chamber.
If you take yourself too seriously, expect me to do the exact opposite