The 626R's in my opinion are indeed pretty special. The Denon may just not be up to the task of driving them as you might like (which would not shock me, I believe). You may be in a position to add a 2-ch amp to the Denon that is better suited. If that doesn't suit you, you may need to look further than the usual Denon/Yamaha/Sony receiver suspects and get something higher current...even many vintage receivers are not out of the question, but you are not limited to them. A comparatively high-current amp would solve the small soundstage problem, a sign the Denon amp (as well as its power supply) is not up to par for the 626's. Hope this helps.