Reducing Resonance Between Speakers and Stands – Need Advice

My suggestion with speakers like this is to focus less on spikes and more on preventijng rocking.  You want to minimize the ability of those speakers to respond to the force generated by the motors (drivers).  Given the right situation, distance from speaker to floor, weight, etc. the speaker if not the speaker and stand will rock back and forth, which causes the bass issues you are noting.  

My suggestion as an experiment is to put a cloth on top and add 20 lbs. and if you hear night and day differences you know hot to address the problem. 

I use silicone drum dampener pads, these and BlueTac were recommended by Mads Buchardt (Of Buchardt Audio speakers). I compared them, and much preferred the drum dampeners; and they leave no residue 

 https://www.amazon.com/Dampeners-Silicone-Silencers-Dampening-Non-toxic/dp/B07SDFZ7LH/ref=sr_1_13_sspa?crid=1Q81B56P4M8RQ&dib=eyJ2IjoiMSJ9.VUU79QqvGZ-Nd__S0idGBpAKD872b9iufTqkq475txpZPWSLZMDab6ANuAbKnlCcoRotk_jMKHJr4VUc0-hQtxQQORScdmLgzqa_bkiC6qo9BeFg6K3YEAMO5-NaxhOAJ33umAH9ZyHFWmv1vKlXx5cPz0JDI7hqfh3o-UM34KtcrMRAKPjb0CsotvG0mxSkNIPc2zPApaDnct-nu0IrdGVIlfYBRRMLZ2rqDE9GkXUZqZ8ReWphZDRlUOW70Cwzwh2Zrae9_imP3kp_nUnyanArurKqpTQTWj7RSVtiZjE.VLOFrZAYa1BqHM0CQwOqHKq5jRoaIeijB894vpgn4-k&dib_tag=se&keywords=silicone%2Bdrum%2Bpad&qid=1763926192&sprefix=silicone%2Bdrum%2B%2Caps%2C148&sr=8-13-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9tdGY&th=1

Stands are very important to get good performance.

Seems like trying to get an inexpensive stand, which I’m assuming simply holds up the weight without vibration mitigating incorporated in its design, to perform better is problematic.

+1 for better stands, especially for the high quality Josephs

blue tack is good or just clay squeeze thin to start. 

My experience in pro is Sound Anchor stands - these seem to always sound best.  I don’t use iso acoustic pucks or any other kind of decoupler, I avoid blue dots, they stick to the speakers and after time can actually pull the veneer or paint off.  Sorbothane is "wet" and same problem, they stick.

Ive experimented with other types of springs and isolators so I’m, not against them, but the high mass stands seems to make the most difference in improving the sound.  

Simple ADJ1’s for bookshelves is what we use for all our demos.  ADJ2’s for larger heavier speakers that are still technically bookshelf.  They are also height adjustable.  The new LMS 1 and LMS 2s are for larger speakers, such as large ATC 50s or 100s in monitor form.