The Polk Audio TL150 Speaker is a Big Speaker Sound Without The Big Speaker Whether you're looking for your first home theater sub/sat system or want to upgrade to more performance, you're in for a big surprise in a small, compact package. The predecessor to Blackstone TL, our RM series, was always about "Big Speaker Sound Without The Big Speaker." Blackstone TL represents a significant leap forward, delivering an astonishing home theater performance never before heard in compact loudspeakers.