Springs are the way to go. All the talk about the springs in this post is all true. I looked at the Gia twos and I was disappointed but there’s no springs in those it’s like ball bearings and rubber layers. You’re welcome for the scientific explanation. LOL I install these on my sub woofers and my regular speakers. It’s been about a year and they’ve done a great job. As soon as I install them I noticed the difference that all the rattles in my room were gone. I’m not gonna tell you that the soundstage was bigger and blah blah blah, But they were doing a lot of isolation because as the volume went up the rattles became more frequent and now as loud as I can listen to it which is beyond comfortable there are no more rattles. Before I install these I drilled a larger hole in The bottom foot to allow me to screw them into the threaded inserts of where the original feet were. Each foot supports between 30 to 40 pounds. Here’s the link.
https://www.amazon.com/Nobsound-Aluminum-Speakers-Isolation-Amplifiers/dp/B07K9ZYP84#HLCXComparisonW...
https://www.amazon.com/Nobsound-Aluminum-Speakers-Isolation-Amplifiers/dp/B07K9ZYP84#HLCXComparisonW...