Two IXL 18s as Mike mentioned would be really nice - there's also a 21" Maelstrom that will be coming out in a few months - not sure on your time frame. You also have the Maelstrom 18", the CSS 15", the FiCar Q18s, the Shiva X 15"......lots of options.From what I've read, I think I can go with one 18" SW, or two seperate 15" SW's. (either option being LLT's)
Definitely possible, but not advantageous. If the bottom ends are mismatched between two subs, then the summed bottom end output will be weaker than higher bass frequencies.Would it be possible/advantageous to go with two seperate 15" SW's, with two different tuning points, one @~15htz and the other ~12htz. point being two different low freq tunes?????????
It varies from driver to driver. 'Most' high excursion 18s like something at or above 600 liters, but that doesn't mean they all have to.but in the "LLT explained" thread, Steve states that I would need twice that volume for an 18".
Just volume. That said, you'll want to ensure ample clearance room around both port openings.Oh yea, does port tune Fr(dia and length) correlate to just box volume or box volume and deminsions?