Metal, aluminum, or wood for a rack ?

I just glued and screwed my two 3/4 in Birch plywood shelves together to make 1 1/2 in shelves and rapped on them with my knuckles and it was very impressive.

It sounded like you hit a concrete block.

No reverberation or resonance to speak of.
It's much better that the 1/2in MDF I'm using right now.

I'm also using Maple butcher blocks with cones between the shelves and the amp and CD player.

It's comming along just great.
When I'm done I'll put new photo's in my virtual system and update it.
Have a great day.

Oh.... +1 on the wood resonance.

I have finnished my rack. I'm so proud. It turned out beautiful. Very solid.
Click the systems link to check it out.

Z:

Nice rack. I wish I took woodshop in high school. I got stuck with two semesters of printshop due to scheduling problems. Maybe in my golden years I'll take it up.

Beautiful rack John!!! You did good.

It's amazing what a touch of wood can do.

Very nice job indeed! Your work has given me some ideas for a new rack system. I think I may try alternating layers of 1/2" mdf and 1/2" plywood.