Add to Cart Compare Quick view JBL Professional JBL 3739 Low Frequency Speaker for 3722/3722N Systems Now: $1,164.26 Was: The JBL 3739 LF Speaker serves as part of the 3722/3722N ScreenArray Cinema Loudspeaker System. The low frequency speaker provides a 40 Hz to 2k frequency response, providing clear sound and clear bass notes. Now: $1,164.26 Was: Add to Cart Compare Quick view