Subwoofers and Seating Position for Klipsch Forte iv's

My listening space - at approximately 18 x 15 x 8 - is markedly smaller (and less rectangular) than yours, but I faced the same problem. I, too, use Quicksilver tube amplification with a pair of Klipsch Belles - and struggled to find the best placement for a pair of badly-needed Rhythmik F12SE subs. (I realize this is all too big for the available space, but it’s what I have to work with. Plus, it makes for a nicely intimate "nearfield" listening experience). With the Belles placed along the "long" wall, I have each sub facing inward (across from one another) at the midpoint of each side wall (as suggested, I think, by @soix above). I experimented with them in the corners and, vice versa, on the long wall just inside the Belles . . . . neither of which sounded optimal. Since my "room" is a squarish formal living area that connects to the formal dining room and to the front foyer, my placement options were necessarily limited. Frankly, your Forte IV’s would be a much better fit in my space. Good luck!

I replaced a pair of excellent subwoofers (I will not mention the name/model) with a single RSL 12S (placed in between my Lascalas) and am thrilled with the coherence and dynamics of the combination. With your room, maybe a pair. Good luck. Always, MrD.

All your comments are great stuff, thanks!

@noromance - placing the main speakers on there long wall is not an option. Trust me, I have thought about it, including my wife's reaction! 

@souix - a lot to think about. I think the crawl method might be best. I have an opening to a stairs at one end and another adjacent space at the other end...It seems that is should be easier to find good placement for a listening chair rather than a listening area?

@tds3371 - I just can't get my head around the mid wall location. Probably need to better understand the physical properties of the sound waves and nulls?.

@mrdeci - Interesting that the one sub woofer is doing you good. Can you share why the new single sub is better than the two? Just too complicated with multiple subs for your space? Or the new one is just better fit to room? I was wondering if I should just start with one. I suspect that it would be am improvement, but would/could I be missing with two? Although most of what I am reading on forums is telling me two or more.

Do any of you have opinions regarding musicality of different brands of subs?

Do you think mating subs with horn speakers is more complicated than with non horn speakers? Read about that on forums and seem to be equal camps based on what I have read on this one.

Thanks!

a lot to think about. I think the crawl method might be best.

I completely agree and was hoping you’d be up for that.  The other placements are just general guidelines and may or may not work well/best in your particular room because every room is different, so the crawl method at least ensures you’re getting the bass tuned specifically for your particular room — it just takes a little more effort upfront, but it’s one and done and well worth it IMHO.
 

@ noromance  +1

1. I will second using a distributed bass array if you really want to improve low frequency quality.

2. I would also try moving everything further out from the front wall. Perhaps 8 feet.

3. If you do stick with two subs. Put them where they sound best, as opposed to where they look nice.