Check out the words woofer pumping and subsonic filter on the forum search.
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Do you live close to an ikea, if yes your in luck. Buy an ikea "LACK" table they are light ridged little stands that cost next to nothing can support your TT and can also be treaded for spikes. I also here that Target and Walmart sell a table similar to the ikea in their furniture dept.The only thing their's is only in "black" where the ikea comes in numorous colors.
A cheap fix is to get some wheelbarrow inner tubes and place them on your horizontal surface, then put a cement block or slab of wood on the inner tubes. On this you can set your turntable. I learned this trick in graduate school where we needed a vibration-free platform to damp out building vibrations and our research group didn't have any money. Your woofer pumping issue is another problem that probablly is due to a mismatch between your arm and cartridge. There is a lot of discussion on this forum about fixing it.