Originally Posted by cathodeRay
At the far end of any speaker rating (24 or 18 Hz.) that's at the maximum distortion level they wish to divulge. So for me, if I wanted a solid 24 Hz. I get the 15". If I wanted a solid less-than-20 Hz. I'd go for a more expensive brand. The new Klipsch's (SPL line) seem better than the previous models based on reviews and they are a good 'bang for the buck' though.
This is very much like my thinking as well, 24Hz is the absolute lowest of the SPL-120, not the realistic number one should expect.
Originally Posted by eljaycanuck
Assuming an 8' ceiling, your space is just under 2,000 cu.ft. The SPL-120s could work in there, especially if the archway isn't too large and you're on a suspended floor. That said, at $950, shipped, a pair of Monoprice Monolith 10" subs might be a better choice.
Spot on, archway is perhaps 4 feet across, 7 feet high, rounded arch.
Suspended wooden floor, planning on adding SVS Soundpath isolation feet, decoupling should be very good.
Those Monolith's looks good, however they don't sell in my country, I live in Sweden.
See these, they're $1200 a pair, scroll down for specifications, translated from Swedish to English through Google.
18 - 180 Hz (+/- 3 dB)
1045 W Peak / 700 W RMS, Class-D, ICEpower
0-180 Degree Variable Phase
3x EQ, PEQ
5 Year Warranty
They seem like a steal to me, however they won't match the Klipsch.