what is the purpose of a rack ?
i see two .
1) a way to access components (i place them on the floor)
2) access the components and avoid intruding resonances at certain frequencies.
so the question is if materials resonate at a certain frequency, which one do you prefer.
i would think achieving a resonant frequency as low as possible is the way to go.
thus, i would opt for wood. you can always use anti-resonant devices under the components.
i see two .
1) a way to access components (i place them on the floor)
2) access the components and avoid intruding resonances at certain frequencies.
so the question is if materials resonate at a certain frequency, which one do you prefer.
i would think achieving a resonant frequency as low as possible is the way to go.
thus, i would opt for wood. you can always use anti-resonant devices under the components.