The one-Pi's sound very clean and rich in the Midrange but lack low bass , made for subs, in a larger box like 1 cu.ft. or larger will get by without a sub. In my Opinion the two-Pi towers are one of the best sounding speakers made. Wayne Parham has stated these to sound better than any speaker in their price range. I agree. I would tell anybody making speakers to make the 2-Pi towers first. These speakers dont need subs at all. when compared to other speakers, me and my friends that listened prefer the the 2-
Pi towers. Fall in love with tone, Silky treble that is clean and not harsh. Great bass punch with nice low sub bass overtones. I would take the two-Pi towers over the one or two pi with a sub.