Hi,
I also have a Z9 and yes, boy does it get hot.
In one corner on the top of the unit, I bet I could fry a couple of eggs after watching LOTR:Return of the King EE, possibly some bacon too.
It does get very hot, and needs a good bit of clearance above/next to the unit (as Yamaha clearly state in their manual).
However in saying that, I have not had a cut-out yet and no heat issues I know of whatsoever, and reading elsewhere, the Z9, even though it does get hot, seems to be designed to with-stand/handle the heat.
If you are having problems with cut-outs and automatic shutdown, it probably means you have some serious overkill in equipment connected to it, or have equipment incorrectly connected, or are playing an excessive volumes, but, more likely the Z9 is faulty.
I have the following currently hooked up to the Z9:
LINN Ninka Fronts (using both A and B front connections)
LINN Katan surrounds,
Boston Acoustic Back Surrounds,
Paradigm front effects
Monitor audio Center
2 subs
And I have then played CD’s in 9 channel stereo mode for a long period of time at ‘just above comfort’ levels, also not to mention the many movies/music DVD’s I’ve listened to, and not a problem with heat, even if the Z9 gets to be nearly to hot to touch.
So yeah, if there are problems with a certain Z9 and heat, to me, I’d say the unit is faulty and should be replaced with a completely new one.
anyways, cheers
KJ