Description
The ST-PA6 is a compact 6 watt audio power amplifier designed to provide clean, reliable amplification in small-scale audio installations. It delivers 6 watts RMS into an 8 Ohm speaker and combines amplification with a built-in two-input mixer. The unit is engineered to offer low noise and low distortion in a compact package that is cost effective.
Key features include two balanced audio inputs for flexible wiring, a single gain control, and an adjustable loudness equalization control. Inputs are actively bridged and summed to allow easy monitoring of stereo sources through a single speaker. The output stage includes protection against short circuits and thermal overload with automatic reset functionality.
Performance characteristics include a frequency response of 35 Hz to 20 kHz with ±1.5 dB variance when EQ is flat, THD+N under 0.35 percent, and noise below -60 dB. The equalization control provides selectable low-frequency boost options of up to +5 dB at 60 Hz, +4 dB at 100 Hz, and +3 dB at 120 Hz. The amplifier meets rated power output when driven with a minimum input level of 400 mV RMS.
Connectivity is straightforward with two 100 kOhm balanced inputs that may be wired balanced or unbalanced and a single 8 Ohm unbalanced speaker output. Inputs are mixed internally so two sources can be monitored or combined without external mixing hardware. The unit is powered from a ground-referenced 24 Vdc supply drawing 400 mA.
Typical applications include paging or background music in small retail spaces, monitoring in broadcast or production environments, and source summing for stereo content monitoring. The ST-PA6 is suitable where a small footprint amplifier with summing capability and tone control is required. It provides a practical solution for installations that need modest power, simple control, and dependable protection.
Installation is simple and straightforward, with a compact enclosure that ships in a small cardboard box. The output protection circuit automatically resets after fault conditions clear, eliminating the need for external fuses and reducing downtime. Overall construction emphasizes reliability and economical ownership while delivering consistent audio performance.