My understanding is that "big" sound comes mostly from two things: wide dispersion and powerful, extended bass. It's also aided by brighter sounding speakers, but it's not a requirement.
Let properly placed subwoofers handle the bass and focus on finding speakers that have good midbass, and effortless mids and highs. Waveguides often help to blend the drivers together.
Last edited by Soulburner; 07-20-2019 at 08:36 PM.