How does a REL subwoofer add dimensionality and depth to a sound system?

I have 3 RELs bought "previously owned" which were manufactured a while back ("Q" series) and cost around 200 bucks each. Hard to beat and hardly "overblown" especially relative to comments like Millercarbonfootprint's bloviating about his gear...a Swarm system certainly is a good idea but many don't have room for it or can afford it, and used RELs are easily obtainable...and the signal comes from the power amp, a great idea. Do the research and ignore absolutes from the unfortunately biased...you will see...

Any good sub should add what normally exists in live settings...that's the thing. Low frequencies are around in the real world, it's just that few speakers can reproduce the lows without a sub. I use 2 older RELs with a SEP (main system...another REL in my TV rig) amp and they work extremely well, are built like a tank, and are perfectly designed for their purpose...no DSP needed as I simply adjust them when it’s (rarely) called for. Not sure what the above rant is about, but hey...folks gotta rant!