AVS Forum Special Member
Join Date: Jul 2011
Location: Lone Wolf McQuade from Islamabad Pakistan
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When it comes to subs, Klipsch are very crafty in hiding details. That 110dB SPL @ 30Hz is at 1W/1m in 1/8 space. Which, in real world from an average listening distance (9-10ft), translates to roughly 97dB @ 30Hz keeping every other thing constant. Moreover I doubt this sub's -3dB point is 26Hz.
I used to have a Klipsch Sub-12 whose -3dB point was listed as 24Hz and I measured the port tuning frequency to be around 31-32Hz. That sub was actually 15dB down at listed 24Hz compared to 31Hz. And trust me Sub-12 was a very good value sub in its days and it was priced a tad over $300, which was marginally justified.
On the other hand, I also own PSB SubSeries 300. The rated +/-3dB point of 27 will be close to 23Hz depending on the room gain. I reckon in your room (2500 cuft), it should be flat down to 30Hz with a shallow roll off giving usable output down to 22-23Hz. This sub, as I said before, is a mini monster. The box is virtually inert to any resonance and distortion. And it is surprisingly loud for its tiny foot print. It is well braced internally despite having just 0.8 cu ft net internal volume.
Klipsch SW-308 is no comparison to this sub. Rest, it's all your choice. Hope that helps.
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Main System: PSB X2T, PSB XC, PSB XB, Cambridge Audio Azur 751R, Rythmik FV15HP, PSB S500