Steve, yes the 607 is lower than the 906 and apparently just barely fits, but I didn't mention it because I assumed that you might be looking for features(not necessarily power)more similar to the 906. The 607 might well have enough power to meet your needs depending on how loud you listen and how wide the dynamic range of the program material is. At least it might have enough power before it shuts down because of overheating in the confined space it's been crammed in to. That's simply a bad idea for any receiver, or even a preamp, which of course does have a lower-gain amplifier in it.
