I want to fill my room more, so around me…my primary objective is to open my front to back soundstage and possibly improve upon what I’ve already have.
I don’t think it’s possible to achieve what you’re looking for with your speakers placed as they are and counter to how they’re designed to work without corners, and throwing $$$ at cables or equipment probably won’t help much either because you’re just fighting an uphill battle against physics. If you haven’t already, I’d try pulling the speakers 3 feet out into the room just to see what happens (hey, it’s free right?), and I suspect that alone will give you a lot of what you’re looking for. If your speakers sound poor being pulled further into the room then my only suggestion is to get new speakers that will work better in your room and can give you more of what you’re looking for or just live with what you have given the room/placement issues. Sorry, I don’t mean to be negative but neither do I want to see anyone throw potentially big $$$ into new/different equipment that likely can’t fix what looks to be mainly a compromised room/speaker situation. In any event, best of luck in achieving what you’re looking for.