These offer open space on all sides of the equipment (dodging the red ring of death on my xbox 360). The Onkyo receiver is also known to run hot. I have had these up for over a year now, and have had no heat related issues with any of the equipment.
The basic idea is to have a single hook that attaches to a stud with two steel cables that come down and attach to the two horizontal pieces of wood. While one vertical piece is attached to the stud as well and holds the other side of the horizontal pieces.
These directions are going to closely match what was done with the Media Shelves, so if anything doesn't make sense take a look at that instructable.
Check out my other industrial shelves for a complete set: Media Shelves and TV Ledge
Step 1: Tools and Materials
Miter Saw (This could be replaced with a hand saw easily)
Nice Sharp 3/8" drill bit
3/32" counter sink drill bit (for screw pilot hole drilling)
Palm Sander (I love this sander for how easy it is to install the paper taut)
Heavy Duty Wire Cutters
Crimper (looks like bolt cutters, but instead of cutting, they crimp)
Paper (for design and sketching)
1"x4"x6' Pine (with or without knots, up to you, or any other wood for that matter)
1 5/8" Drywall Screws
2 1/2" Drywall Screws
150 Grit Sand Paper
about 11' of 3/32" steel cable
2 splicing fasteners for the steel cable
6 stopper fasteners for the steel cable
Heavy Duty Steel Hooks