POLK AUDIO ATRIUM 4 ALL WEATHER OUTDOOR SPEAKERS (PAIR) Efficiency: 89dB

Efficiency: 89dB

Parallel Recording for making identical tapes simultaneously

External pre-amp input terminals

This method of construction helps reduce the transmission of mechanical vibration and ensures that every single element inside the unit performs at its best

POLK AUDIO ATRIUM 4 ALL WEATHER OUTDOOR SPEAKERS (PAIR) Efficiency: 89dBPOLK AUDIO ATRIUM 4 Big Fidelity, Small Speaker. The Compact Atrium4 loudspeaker produces high fidelity sound quality anywhere you want great sound. Its small size makes it ideal for tight, out of way installations. PATENTED DYNAMIC BALANCE The perfect material performance, eliminating driver and tweeter "artifacts" for more realistic sound reproduction at high and low volume levels. To install, simply mount the bracket and click the speaker into