When I bought my TV stand years ago, I neglected to get one with ample spacing between shelves for a potential receiver. I have noticed that most receivers are approximately 6-7" tall. The ones I am leaning towards are 6.5". The shelves are 8" apart. This leaves me with roughly 1" for ventilation. Is this enough? Don't know if this makes a difference, but the shelves are composed of glass. Do certain receivers run cooler than others? Looks like I will be getting an HK receiver or possibly a Denon.