Yup at last proper gut wrenching Bass, Ok the REL I've got isn't that big a Q50 to be precise, a single 12" cone, no reflex porting and a modest 50 watt RMS amp, but my lounge is small and I've got a pair of Mordaunt Short MS45Ti's as my main speakers, so for music at least not really needed.
When I 1st plugged it in and fired it up it took a while to get it properly integrated into the system, but after a full morning of tweaking it sounds sweet, TBH though you would swear all the bass is coming from the main speakers, which is how it's meant to be, Ive tried it out with a whole host of music and movies and the sound makes my sofa vibrate, just awesome
As a side note I bout it off Ebay for £44 so a bargain, and the bloke i got it off is a bit of a hifi nut, a wammer and we had a long chat about Scalford 2012 and stuff, a really nice guy, told him he should check out AOS, so you never know, anyway here's the new addition in situ, apparently they are meant to sound better firing at a wall, but i found this way was better for my setup.