Endless debate: monitor + sub vs floorstanding

Forget all the previous suggestions and get a large room with Magico Q5s and Boulder amps. Otherwise a used REL sub...I've had all the above mentioned options (except the Magico/Boulder thing...I only heard that in a shop) and in the last year my little used REL Q150 with some modest but well regarded small towers has made me a believer...in my current room anyway.

Wait...I want to talk about subs!

After trying a few different locations, my REL Q150E (ebay $150 last year...lucky score) ended up in a smallish corner created by a fireplace (fake) firing forward behind my left speaker. I put an angled Speakon plug on the signal cable and use an angled IEC ac cable so it fits back there nicely without cable squashing. The room has a very good sound at my "sweet spot" and the crossover is set at around 50hz or a bit under...my mains are Silverline Preludes that don't do much under 50hz, but their bass is nice and fast (four 3.75" metal mid/woofers) and they integrate amazingly well with the REL. I put a "chicken head" knob on the volume pot of the REL so I can adjust it readily if need be. All it needs is a couple clicks up or down sometimes depending on the source and how I feel about it.

Marburg combines florid with lurid and "I like it, it's good" (Robbie Robertson), I concur, and celebrate the lack of mirth control.

Room sound is the elephant in this room. One "leetle" 10" woofer in my old REL (150 watt mosfet) is plenty of bass for my hifi room...I have to keep the REL level under control or my walls would crack, but it is dialed in enough so level changes are minor (it's at maybe a third of its output seemingly, based on the volume knob). One of the things I think is a benefit of discreet powered subs is the ability to control deep bass output as otherwise there are no tone controls on my (or likely your) preamp.