Just checking back into this thread but I see Dave and John already answered. Randy's Denon has already done the delay measurement so no need to add the 3 ft for the DSP. In my setup I add yet another 3 ft account for the processing of an SMS equalizer. My EP600s are 3,9metres from the main seat but I have them set at 6.0metres in the delay. It seems tighter to my ear there. Notwithstanding the Denon's room correction setting, I would suggest adjusting the delay manually up or down and listen if it tightens the bass further because it may help the overall phase with the mains.
