Subs for Treo CT


I’m looking for some advice and help from folks with more experience and knowledge than me.  Just bought a pair of Treo CT’s and am blown away.  I have one Rel T9i sub hooked up, and it’s a noticeable improvement, even as good as these speakers are.  I have a small 10 x 14 space.  Thinking about two subs, so the question is:  a pair of T9i’s, V2W’s, or Rel s/510’s?  I don’t understand how an external cross over works, or whether I’d need one with any or all of these pairs, so that could add additional cost I know.  I also understand diminishing returns as the cost goes up.  Does it even make sense to consider the bigger Rels, since the cost at that point is just a bit less than the Quattro’s?  My front end is exclusively streaming, and I listen at moderate volume.  I don’t know if this is enough info or not—This level of equipment is something new for me.  Thanks for any help!
cosmic_charlie
No crossover. Just add subs. Buy more, not bigger. Three pretty good subs is better than one really good sub, in other words. The key to really good bass is lots of subs spread around in different locations so that they all have different bass modes at different frequencies and locations. This results in much smoother bass than you can get from fewer subs. Do a search for Swarm subwoofer system or distributed bass array, and pay attention to the guys like me and Tim who actually have done this. https://systems.audiogon.com/systems/8367 

Notice this is five subs, three different types, in random locations around the room. The bass is phenomenal! And Moabs already have really good bass, but with DBA its even better. 

Listening at moderate volume you will be able to adjust yours to the level that works best for the volume you care about most. It will be sort of like a loudness control. This won't work nearly as well with one or two subs because the bass is lumpy but with a DBA its so much smoother, so much more articulate and tuneful you'll be able to set it higher which will be perfect for lower level listening. If you turn it up real loud you will have too much, and in the long run you will find the happy balance. 

You won't need bigger right now but long term might be a different story. Notice mine are mostly 10" and my room is big 17x24 so its not like you need big subs, but if you can get a deal or will be in a bigger room some day then maybe buy for the long term. Main thing is to get to where you've got at least four. 

Great choice on the Treo CT I'm abig fan of Vandersteens have Quatro woods  your best sub with the Trees is Vandy sub 3 it can be dialed in to the room and blend perfectly 
the cross overs work by cutting the lows 6 Dbs to the Treos and the sub 3 take care of the lows hope that helps a little if you need more info contact John at Audio Connetion he a fountain of info 

Enjoy the Music 
Tom
@Tomstruck has it right - try to get a Vandersteen sub 3, you will get accurate bass and take major load off Treo and importantly the Treo amplifier with the high pass system. Swarm is competitive and an excellent solution in situations where you don’t mind 4 more boxes and want better bass in more areas of the room. By now you probably understand that the Treo are designed for an optimal seated listener position and the 11 bands of EQ on a sub 3 enable you to get great bass at that position.
Have fun, enjoy the music.
who is your local Vandy dealer? I know most of them.
jim
Congrats on the Treo. IF you need setup assistance don’t hesitate to contact me - I do that frequently- just finished a pair of Treo CT with Aesthetix Mimas integrates - lovely sound.
jim