Has Anyone Tried Nobsound Springs Or Other Isolation Devices Below REL Subwoofers?

Thanks for all responses. I’ll attempt to try it myself when I receive the sub. Just thought of asking here beforehand.

Missioncoonery - Three S510s? Wow, that sounds awesome. Unfortunately my room can only accommodate 1 due to space limitations. Current budget does not allow more than 1 anyway.

By the way, the manufacturer does not always give proper advice as I have found out. I own some Harbeth speakers, and the manufacturer/designer advised that the amp does not matter with their speakers as they will all sound the same. If I followed the advice about 13 years ago, I wouldn't have the Harbeth in my system today. 

My S/510 was extremely overpowering my room until I took the advice of a few ppl and moved it out of the corner and put a thick granite slab under it…bingo, problem solved. Soon as I move to a new joint I’m adding another S/510 to my rig, these things are incredible.

I tried a quadratic array of Nobsound springs under a REL T/9x, and it did not result in sound preferable to the stock configuration regardless of the number of springs per footer.

I’m aware REL does not recommend isolation, however, my s/510 sounds less boomy & more focused on a Townsend Seismic Podium. I much prefer this sound than resting on carpet.