I am looking at the Quad 988 myself. From what I have read in Absolute Sound, if you put the 988 on stands, you could get a suckout in the 100 -200hz regioun. They are design to be placed on the floor and Quad even went so far to redesign the 988 so it wouldn't work with the Acrici's used for the 63's. You can tilt the 988 which may help.
Good luck.
Scott
Good luck.
Scott