About the hiss. When I got my ForteII's I noticed a hiss coming from them. I was using a Carver AV-705x amp and other carver stuff. The AV-705x has a gain potentiometer at each channel. I turned the gain down slightly and now have no hiss. It didn't hurt the sound and I still can't turn the volume past 10 o'clock. Don't know anything about Denon, but there is probably a gain adjustment inside.(you may not want to go there, though).
for what its worth,
john