Well, I tried the pipes but without an obvious result, so the investigation will continue.
Then I put the Final Sound 300i on top of each subwoofer still keeping the same short distances from the back wall, played around with the toe in and achieved an acceptable soundstage, extending beyond the sides of the speakers. I suspect the reflections are slightly smearing the image, giving me the impression that the sound is coming from the outer sides of the speakers, but it does conjure up a wider stage. I am not sure about depth so much, but its the best setup so far. I want to try the pipes next, after having played a wide variety of music. Listening, with my eyes closed, its easy to make out the vocals coming from the center, easily putting the vocalist in the middle of the line between the 2 speakers. I havenīt had any experience with how much depth one can get. I can tell
some sounds are from further back, but in between is still a mystery so far. Anybody care to explain or help?