Elevating subwoofer about two feet off the floor

Uh, there is no 20 Hz information on virtually any recordings. Most people are lucky if the get flat FR down to 35 Hz in the room. Putting the sub on springs greatly reduces energy of all frequencies transmitted from the sub cabinet via the floor to the front end electronics. This is especially true for speakers and subwoofers since the Fr of the iso system is much lower than the lowest frequency the speakers or subs can produce. By the way, as shown in max Townsend’s YouTube video, isolating speakers or subs reduces cabinet resonance as well as isolates front end equipment. Two, two mints in one! 🤗

mijostyn541
 "entire house will start shaking including your wife."
Perhaps now I won't need the movie and wine?  

ptmconsulting said: "Then on a lark, I turned them upside down. Yes, I did place a cutting board on their upturned feet, figuring they would need something to simulate a floor. That's the ticket. tight, precise, invisibly integrated. I heartily endorse anyone to try this and see if it works for you."

Would it not be the same effect if you elevated the sub the distance of the upside down port by setting them on a stand/table/DIY setup with a surface similar to or use a cutting board for the top of the stand? It seems you would end up with the same improvement with your awesome REL sitting upright as designed.