Thinking of adding a sub---maybe not?


Looking for some advice. I'm thinking of adding a sub to my system and the one I'm considering is the REL T7. I've had subs (Canton) in the past with my older systems but it's been many years since then. My system today consists of a Luxman 505UXii integrated amp, a Marantz ND 8006 CDP/streamer, Dynaudio S40s and a pair of Tekton Lore Reference--I alternate the S40s and Lores through speaker A/B on the Luxman. My room is about 16 x 25. I love my system but after having subs in the past and getting the bass 'punch' from the subs, I'm debating whether I should go that route again. I've tried the loudness button on the Luxman but it just doesn't give the same results as a sub would IMO. Thanks in advance. 
bluorion
soix,

" My experience, once you have a pair of subs properly dialed in you’ll not only have better bass but also a significantly expanded soundstage such that when you turn the subs off the whole presentation collapses and you won’t wanna listen without them anymore." I agree with your statement. In my experience subwoofers have improved my soundstage and just made everything across the audio spectrum sound better. I don't hear my subwoofers at all; until I turn them off.
I am using a "full range" speaker with Very Good low range specs.  After adding two cheap powered subwoofers, (to see if the results would be enhancing), I was astounded at how the upper bass, midrange, and highs opened up and distortion was reduced.  I am looking forward to high quality subs in the future, but for now, the sound is great.
+1 @ricred1 . Subs offer a lot more than just deep bass. I am a Rel fan because they are so easy to integrate plus they use the same signal as the amp sends to the main speakers
Soix rcommended what I would have, two SVS SB-1000 Pros. I own two different REL subs and both are great but more subs is better if they are good quality. Read up on distributed bass array and I'll say, it works.
I now have two SB-2000s and one SB-3000 (all sealed SVS) at 50Hz and 40Hz, and those three are much better than my single, very good REL sub was. I want a fourth...    Good luck!