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.
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.