ive just splurged on a x4200w,the online manual is making my brain ache.

.This is way off topic i apologize beforehand.what are your thoughts on dynamic eq?do you use it?.
Don't use it if you don't need to. If you have neighbors that's the point of dynamic eq. Otherwise, you just should really eq it first to be flat using the equipment you're given. Buy a mic stand for the mic or it won't setup correctly.
Once you have a flat response. Then adjust to your personal liking.
I personally push up treble and bass and center channel. Because I want to hear people talk I love big booms, and the high end is just never loud enough for me. Screw with the eq though see what you like. You should be allowed to do this is audyssey after you run a setup.
However all of this changes if you're in an apartment and have to be wary of neighbors like I am now. Now, I just try to keep my sub from rocking the whole building as well as my tower speakers.
I suggest heading over to avsforum.com for help on setting up your Avr correctly as I'm sure there is a ton I've left out.
I miss using my speakers, but alas, they're just too powerful for apartments.