Metal, aluminum, or wood for a rack ?


I'm going to be purchasing a new rack and would like some input on materials used on audio racks.
Is there a sonic differance between metal or aluminum on the frame of an audio rack ?
My amp is an Almarro A318B SET tube amp.
My CDP is an Emotiva ERC-1.
Thank you for any info.
John
128x128zmanastronomy
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.
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.
Hi Dan.
I'm always glad to inspire someone with new ideas.
I looked at your rack and thought it was very nice.
I also like the horn speakers. VERY coool.