Profile: Radio Design Labs is a manufacturer of audio, video, and control modules for the broadcast and communication industries. Our product line includes mounting accessories, engineered systems, remote panels & controls, test equipment and power supplies. Our AFM‑A1 is an ULTRASTYLE plate that adapts an APPFLEX module to an RDL WB‑1U universal wall mounting box. The AFM‑A1 features the standard two color ULTRASTYLE design. Our FP-PA35A 35 W mono audio amplifier is the ideal choice in many applications, where multiple 25 V, 70 V or 100 V speakers in a zone need to be powered from a single audio power amplifier. The FP‑PA35A features a balanced line level input that may be connected unbalanced. A front panel gain control is designed to be adjusted manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced levels, as well as professional balanced levels. Multiple distributed sound system speakers connect to the corresponding 25 V, 70 V or 100 V amplified output. The FP‑PA35A circuits are all designed for low power consumption. In the absence of an audio input, a digital timer is enabled to switch the class D output stage off.