Luxman 590axii ventilation

Don't see ventilation holes will help if the centre channel speaker sits directly on the shelf.

??Rig an open frame to support the speaker and raise it a couple of inches more.

Really appreciate all the comments here. I’m kinda stuck with the cabinet and shelf per negotiations with the wife as it’s in the living room. I can get to 4” of clearance above, 3” on each side, open in the back and front. Thinking I’ll pickup the 509x instead and run a fan in the back as last resort if it’s running hot. Sounds like consensus is that’ll work. 

Call the Luxman tech first and confirm that will work before voiding your warranty and possibly damaging an expensive piece of equipment. I was surprised my Luxman 507uX required so much space around it. First time the fan breaks down or you forget to turn the amp off at night you might produce more excess heat than you expect. 

I have the L-509x which is biased to operate 6 watts (8ohm load) Class A.

I have it mounted in an open equipment rack with 4 1/4" clearance above and 4" to each side(but closed off to the left and right by flanking Sorice glass door cabinets for LPs).

As an experiment, I put a free standing dial oven thermometer over the right side vents, middle from front to back.

After playing the unit for 3 hours, the dial reads 99F.

Just fyi....

You need a quiet but stong fan.  Otherwise you are being very adventurous.