AMS-1/4F 1/4" Stereo Headphone Jack - Terminal block connections The jack plate shall be an RDL AMS-1/4F. The unit shall provide a terminal block for fixed audio wiring connections, and one ¼” (6.35 mm) phone jack for user connection. The terminal block shall provide three terminals labeled “L” and “R” for left and right channel identification and one for the common ground. The jack and terminal block shall be a high quality commercial grade. The front panel shall be constructed of black satin powder coated steel. A black bezel shall be provided to finish the D-style cutout hole when the unit is mounted. The unit shall measure no more than 2.06" (5.23 cm) deep behind the front panel and shall be compatible with RDL AMS mounting accessories. The unit shall be constructed to fit industry standard D-style cutouts. The unit shall be engineered, assembled and tested in the U.S.A. and be specified for continuous duty in professional installed systems. The unit shall be specified for operation in an ambient temperature between -10 and 70 degrees C. The unit shall be an RDL AMS-1/4F.