What your choice speakers with spikes or speakers with a vibration isolation device?


I am in the camp of vibration isolation. I think it makes sense that the less energy transfer into the floor goes into the air. I found these really cool magnetic isolation feet that I’ve never seen before. They are very affordable, the guys are from England. Here’s a link, The company is called solid air audio.https://solidairaudio.com
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Vibration coupling, isolation or absorption (turn motion into heat) are different approaches to tuning, which means that, to the extent they change the sound, such changes can be positive or negative.  That means you have to experiment to see which result you prefer. 

As kalali describes above, coupling devices like spikes often are not the preferred approach on a suspended wooden floor because the transfer of energy to the floor turns the floor into a sounding board.  I have carpet over a suspended wood floor and I use a Symposium Svelte Shelf under my speaker (the entire bottom of the speaker sits in contact with the shelf, the inner foam core of the shelf turns the vibrations into heat as the vibrating molecules in the core rub against each other).  The Townsend devices work on the same principle.  This tightens up the sound and makes the bass less boomy; whether this is good or bad is a matter of system tuning and taste.
Quick interrupt, speaker isolation spring type devices are designed to be very stiff in the lateral plane. You know, so the speakers won’t move laterally whilst being isolated. Hel-loo! 🤗 Lateral stability of these designs also makes the system more, uh, stable against accidental perturbations. 😐
I am also on a wood floor like Larry above is. The effect I had was the same that he found, it made the base less Bhoomi and at higher volumes the isolation removed A distortion the fact that I was getting. Probably because the base was going through the subfloor and reverberating back up into the speaker enclosure. The towns in video explains this quite well.Here’s a link to all of his products.https://youtu.be/7ew4dRUEm-k
Here’s a link where the inventor goes into several science experiments and explanations of what you gain.

https://youtu.be/OZxi1oZfvDA

Here’s a short video where he talks about transfer of energy through concrete

https://youtu.be/BOPXJDdwtk4

finally here’s a great video that has some newton in it for Miller carbon!

https://youtu.be/dW9-r83IvhI