Hilroy 48:
A triangle is ideal and maybe you could move 1 foot closer and see what happens?
Yes, anything that could cause a reflection from the direct output of the speaker will do something, although it could be minor and hard to hear. That's the wonder of moving speakers, you can test it with your own ears easily.
Try this test: put both speakers on one side, one in one position, one in another position that might be proposed locations for that side. Then feed them both mono pink noise. Using your balance control, change output from one to the other and you were for certain here a difference in the speakers sound as the pink noise changes based on reflections. Now switch to mono music and try the same thing. You can switch the process to the other side and see which speaker position sounds better. Then after you figured out what's best, locate both speakers as close to that positions you can, maintaining the triangle, minimizing cable length etc..
Usually reflections (causing phase cancellation) mess with the overall tone and image. The #1 goal is to avoid the initial reflections from side walls, so getting speakers away from side walls is important. It's very easy to get a good sound from speakers when placed in a very large room far away from walls. Minimizing the amount of energy sent to large highly reflective surfaces like glass, or tile, or concrete, can make a big difference.
Brad