ST-PA18

RDL ST-PA18 - 18W Mono Audio Amplifier with Compressor and LOOP OUT

The RDL ST-PA18 is a compact Class D mono amplifier delivering 18 W RMS, designed for professional AV installations, paging systems and distributed audio applications. It accepts balanced or unbalanced line-level inputs, with a gain range suitable for both consumer and professional signal levels.

An integrated compressor prevents clipping while preserving audio clarity, even with input overloads up to 20 dB. A red LED indicates when compression is active. The LOOP OUT terminal allows the input signal to be passed to additional amplifiers or devices such as a subwoofer filter (e.g., ST-CX2S), making the ST-PA18 ideal for multi-zone systems.

The amplifier drives an 8 Ω speaker or multiple speakers presenting an 8 Ω load, and is also capable of driving 4 Ω loads. It includes thermal and short-circuit protection and a power LED. Operates from an external 24 V DC power supply (sold separately).

Functionality:

• output power: 18W RMS @ 8Ω (also supports 4 Ω)
• line-level input: balanced or unbalanced
• compressor - prevents clipping, up to +20 dB headroom
• compression LED - indicates threshold activity
• LOOP OUT - feeds signal to additional devices
• power: 24 V DC (power supply sold separately)

Features:

• compact STICK-ON format
• high audio quality at full output
• integrates with other RDL modules
• protection: thermal and short-circuit
• suitable for AV, paging, distributed audio, educational and commercial systems

The RDL ST-PA18 is a reliable solution for professional audio systems requiring compact, high-quality mono amplification with signal distribution flexibility.