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In the Forum: Audio Discussions
In the Thread: Mastodont DIY Rack: Wall Mount?

Post Subject: Hmm...Posted by N-set on: 12/2/2013

I think I've slowly started to understand the behavior of my rack.
A very approximate calculation shows that in my case I should have the profile fundamentals around 20Hz, so
perhaps what I take as subsonic vibrations are actually 20Hz, poorely damped due to the added sand mass.
I've ordered a dirt-cheap guitar piezo and try checking that. The wooden floor I have seem to have the resonances
+/- in the region of the frame (hope my piezo experiments will shed some light on that too): stepping hard close to the frame excites it.
I've followed the mass principle with my mastodont frame hoping big mass=small displacement with a given excitation,
but mass lowers the frame frequencies and looks like I've come close to the floor resonances?

Paul, you seem to have some experience in construction engineering. Does it all make sense to you?

Another random fucktor are the spikes: they look fantastic and they fantastically couple floor vibrations to the frame.
I will try 7cm round feet instead of the spikes to see what happens.

Cheers,
N-set

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