RDL HD-PA35UA Constant-Voltage Version of the Single-Input HD-PA35U Power Amplifier

The RDL HD-PA35UA is the constant-voltage version of the single-input HD-PA35U power amplifier, built to feed 70 volt and 100 volt distributed speaker lines from one line-level source. An unbalanced summing input on RCA jacks drives a single-zone amplifier with a front-panel volume control plus bass and treble tone shaping, and the master level is VCA controlled for remote wall adjustment. A high-efficiency Class D stage delivers 35 watts to a selectable 25 V, 70 V or 100 V bus.

An onboard analog compressor and limiter ride out input overloads for cleaner peak control than digitally limited amplifiers, and standby mains draw stays below 1 watt. The amplifier ships with its 100 to 240 VAC power supply and connects its constant-voltage output through a detachable terminal block.