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 from Polk Audio. The TL150 is Five speakers, one professionally-matched system, your easy-to-connect introduction to the magic of surround-sound, at a price that leaves you plenty of room for making additions. (We suggest a subwoofer, for starters, like our compact and powerful PSW125 or PSW10.) Add extra speakers, available separately, to create an extended surround-sound environment.