RDL ST-PA2 2 W Mono Audio Amplifier - 8 OhmThe ST PA2 features a single, unbalanced audio input, a gain control, and two outputs. The first output is designed to deliver a clean 2 watts RMS into an 8 speaker. The second output is intended to drive 600 transformers, typically on equipment inputs. This makes the ST PA2 uniquely suited to applications such as music on hold inputs on telephone systems which may have either 8 or 600 inputs. If desired, both outputs may be used at the same time.