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The primary mode may not be the lowest present mode, but it will only be apparent if the pick-up's own curve is known over the desired frequency band.

As for spikes, I see no reason to use them on a suspended wood floor, but in any case the idea is to get the frame itself down to "one mode" if you can, and then deal with that one mode by going back and forth between targeting the dominant mode directly and spreading it out, backed up by listening, of course.  If felt on broader contacting feet works to reduce the transmission of floor-generated/borne noises, then...  Yes, the cartridge-on-an-LP method is very effective at amplifying noise that affects the stylus under those "static" conditions.

Again, you might gain something by fastening the rack to adjacent walls and adjusting the tension and/or damping of those connections. In any case, you'll want to prevent swaying of a TT support, and likely a CD transport, as well, and it might even damp some noises that enter the frame from the floor, just like standing there and poking it with your finger.


Best regards,
Paul S

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