Questions.. Xover settings/Amp good enough?

[Erukian]

HI, I got a STF-2 from CompUSSR a while back. Mine was 250 and after tax + the extended 4 yr warranty something like 300. Which striked me as a good deal.

Anyhoo I have these Klispch bookshelves and the specs are like.

49Hz-20kHz ± 3dB
94dB @ 2.83 volts/1 meter

Firstly, the speakers are 75 watt speakers, and my amp only does 20W per channel. But that doesnt explain what's going on below. But it might be a problem with overall sound possibly. What are some good upgrade options?

The thing is i get a big void in my room that's 10x12x8 ft in dimensions. Basically i'm having a hell of a time getting placement done. The klipsch's as have a wide soundstage, i'm sitting right in the middle of the room because my desk is 5ft deep and i need to keep a god 6ft away if i follow klipsch's manual. Keep the speakers about 6ft apart, and your head 6ft away in like a triangle.. Keep in mind this is hooked up to my PC. And the positioning of the Klispch speakers is VERY good. It really goes down to 50hz with some power.

But the sub.. man the sub is just only powerful if im right above it or on the other corner of the room. When i mean powerful, there's liek a -10db drop (2x as soft) when im seated in the middle of the room, which is the only good spot that my Klipsch's sound good. Any idea's? I'm TOTALLY flexible with moving anything around. Maybe move the sub under the desk? theres about 5x3ft of spare room under there. It's a big desk and it goes out from the wall about 5 ft, and my chair sticks me right in the middle of the room.

I basically have this 60hz hump and that's all im really hearing. No matter what wall i move the desk to im still in the middle of the room.

Any help would be.. helpful.

Thanks

[Newbie 13]

Have you tried the set the sub up in your listening spot and walk/crawl around the room to see where it sounds best and try your sub there?

[Erukian]

Yep, i've probably tried most of the technique's you guys have ever listed. Plus many others on other forums.

[Lwang]

If you are in the middle of the room, you basically are sitting in the bass null where everything would more or less cancel out. Nearfield placement might be your only option, which would mean right below the desk or right behind you, this would allow the primary soundwave to dominate any reflected sound, which in your case would become nulls.