Polk Audio AM3365-A TL3 Center Channel Speaker (Black) No other compact loudspeaker outperforms the TL3 compact center channel loudspeaker. That's because the TL3 is built small, but packed with big speaker technology. Dual high performance drivers work in concert with the superior ring radiator tweeter (no other compact speaker has it). Patented PowerPort bass venting works with the steel-reinforced enclosure.