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
Thanks for  the suggestions---I'm going to definitely check out the SVS subs! I had a passive Canton sub back in the day with 2 tiny satellite speakers with my Denon PMA 757 amp. I could shake the dishes in the kitchen in my old house. Fun times! LOL

SVS subs are good at best,stay with Rel especially with 2 channel audio.better sub,better resale...cheers
I would also suggest that you consider JL Audio subs. I use a pair of e112's that are great, but your dealer can help pick the best for your system. 
In a room of that size a good sub or two would make a distinct difference in the bass punch of the system for sure as long as you cross them over at 100 hertz or lower.