Max recomended room volume?

How big a' room before I require 2? May get 2 anyway for other benefits, but...

Thank you

r u talkin' 'bout subs?

the way i look at it(in my truck),the more i like it,the more 'they' hate it!!

I'm quite happy with a single sub in a 23'x17'x8' room, but much of the need to step up to dual subs is personal preference.

id go for two. i have always liked two smaller subs unless you get a really nice big one.