Tell me about your sweet spot.

Re The D response ......Duh.....sorry sometimes I read these too quickly in btwn calls at work.....And re C, your right, unless we are talking about dwarfs with tiny speakers ! Thx !!

Thiels:

8-9' apart, pointed straight ahead or toed in a few degrees (never pointed at the chair). Distance from back wall is about 6'.

Piegas:

Speakers are new to me so I'm still experimenting with these.

In the critical listening position (5-7 feet from back wall, 3+ feet from side walls, 9 feet apart) they are currently toed OUT about 20 degrees [THANKS to Audiogoner Rgs92 for this suggestion]. No left wall to deal with in this position, so they both are moved a bit to the left, which reduces right side reflection. This set-up sacrifices dynamics a bit, but dramatically opens up the soundstage. Need to sit in the middle is heightened somewhat with this set-up.

When pushed (back) out of the way in the casual listening location, they are 2-3 feet from back wall, 9' apart, and criss-crossed. Can't toe them out when they are pushed against the back wall due to side wall interaction, so I tried turning them the other way (same off-axis angle though). Image is remarkably deep even though they are close to the back wall (but not as deep as other location), but not as wide as when they are toed out. Bass is stronger and tighter. Criss-cross set-up reduces some of the "head-locker" issues.

Speakers 8' apart, 4.5' from back wall, 3' from side walls. Listening position 8' from point midway between speakers with speakers angled in so that those imaginary flashlight beams would cross about 8' behind my head.

Speakers 10 ft apart slight toe-in crossing 8 ft behind head, 3ft from front wall, 7 ft from side walls, seat position at 11 ft from speakers 6 ft from bak wall.

I've been playing around with this for the last few days...sigh...(just realized how bad that sounds as I'm typing). I sit in nearfield, and have the lasers meeting at about 4 inches from my forehead (damn, why is it so hard to answer this thread!!).
In all seriousness, I was sort of surprised at how much better they sounded with the extra toe-in. I've been repositioning the speakers since I received the Neuance shelves a few days before, and out of frustration tried that and it worked like a charm.