Talked with Sumiko awhile ago. Recommended not to use the spikes unless on hard wood floor and not on slab foundation.
REL Strata III spikes
I have a REL Strata III sub. The interior of the feet have threaded holes that I assume accommodate spikes. Did spikes come with these subs when new. Assuming they did, is anyone using spikes and is there a noticeable difference? I'm wondering if spikes with floor isolator discs on a wood floor would make a worthwhile tweak.