Matching subwoofer


I have a pair of omega super xr3s and they sound like a little more bass would really make them sing. I’m not looking for subwoofer bass but just foundation and stronger mid bass presence. The omegas are single driver 4.5” fostex. My question is how do I know which rep sub would be best for the speakers ? People seem to look at room size and recommend. 7i. I was thinking tzero might just add what is needed. Also wonder if the speedwoofer 10s or rythmic 12 would do just as well. This is for 100% music . Amp is a set 45 by Alan Eaton which sounds terrific. 
128x128brianportugal
The best way to integrate subwoofers into a system is to bus them to a neighborhood with no subwoofers.  

My subs are less than two years old. They fade right into the room. With the lava lamp on you can barely even see them.
Have you considered an Omega sub to mate with your speakers? I use a DeepHemp 8 with my Super 3i's. Perfect match. It added that foundation I was looking for as well. Louis makes great speakers, including subs.
Thankyou Melvin, I had thought about it but still open.  Riley, the room is still lively but as much a problem now. The kefls50 in that room at the time were really not well suited. I know the room is only tolerable but was comes into play. Thankyou all for your comments.

anyone compared the rel t7i to speedwoofer, hsu or rhythmic l12? Trying to find best value. 
Buy a pair of rel t7i, set them up next to your front mains and give it a listen. If they do not do the trick simply return them. But more likely what will happen is, you will lose the attitude about "best value" and be gaining a new attitude that is more like "how long will it take to save enough dough to buy 2 more". Or maybe just the 2 will put you where you want to be. Either way, when you try this, you will be so happy that returning them will be out of the question.
@brianportugal 

 Riley, the room is still lively but as much a problem now.

huh ?         you should still consider room treatments.   

buying different equipment / speakers isnt going to fix the room issues.