Brass hats placed onto the flexible chassis surface may seem to boost vibrations instead of reducing.
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Cats often like to rest on top of amp. May work like a cheap tweak as well. Knowing that hair-less cat such as sphynx may work the best, but might be pricey to purchase.
Also as we know, cats are also jazz musicians, so spiritually the sound should improve while cat is on the top of amp.
I don't have cats, but my parrot(400g Severe Macaw) often lands on top of my speakers. I haven't noticed any sound changes though.