Your experience of moving to two subs

I've just started playing with this in a PC system.  I'm buying small subs off ebay for cheap and now have 4.  2 tiny PSB sub series 100s and 2 Episode 8" Evo subs.  Episode is a custom install brand and has terrible resale value because nobody knows what they are.  I took a small chance for about $150 including shipping and it's definitely better than I'd expect for that price.  They're not blow the doors off HT subs but get you down to the high 30s.  All 4 subs are sealed.  

I dunno... I might not be popular here in this discussion, but oh well here goes:  I went for many years without a sub at all, with my Epi 100s...  never felt the need.  Have one now, though, and do like it, but it wouldn't be the end of the world if I didn't have one at all. 

Maybe it'd be worth the effort if I have time, space, money, and the correct tech and meters and whatnot to balance it all out with two subs, but I'll cross that bridge if I even feel like it when the time comes.  Maybe if I have a bigger room or something, or just if curiosity gets the better of me.  I'm quite satisfied as is, both with my Epi and my Heresy each w one sub in different rooms.

I do like the one dual-side firing sub that I have with my Heresy IV, positioned right between the speakers... and maybe that two-sided firing helps with the "balance" in my room, but I never localize the sub w my ears... it is a complete disappearing act.

@curtdr, Honestly subs are more for movies or just messing with.  They do make a difference with some music but if you mostly listen to music that doesn't have much below 40 hz you don't need them.  If you want good bass the most important thing is to live in a lightly built wood frame house that lets a lot of the bass escape through the walls.  

I have two rel 812s, crossed over at

32 cycles. What I experienced when I added

the second sub was a bigger soundstage

and more clarity in the mid range. All the best.

If you believe you got good bass - work harder. Don't be satisfied. The reward is great!