Used Meyer Sound P-1A
Used Meyer Sound P-1A units are single-channel control electronics designed specifically to operate with the Meyer Sound UPM-1 loudspeaker as a complete system. The P-1A combines factory-aligned frequency and phase response circuitry with Meyer's exclusive SpeakerSense driver protection, making it a purpose-built companion to the UPM-1. Browse the second-hand Meyer Sound P-1A listings available below to find the right unit for your setup.
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Meyer Sound P-1A specifications
| Brand | Meyer Sound |
| Segment | Audio |
About the Meyer Sound P-1A
The Meyer Sound P-1A is a single-channel control electronics unit pre-aligned at the factory and optimised for use with the UPM-1 loudspeaker. It incorporates six stages of complementary phase equalisation to deliver flat frequency response with strong phase characteristics. The unit features Meyer's exclusive SpeakerSense driver protection circuitry, which continuously monitors power applied to the UPM-1 drivers and applies both RMS and peak limiting only when safe operating limits are exceeded. Connections include balanced 3-pin XLR and quarter-inch RTS phone jacks, banana jacks for the sense input, and a level control with AC on/off and lo-cut switches. Power is 120/240V AC, 50/60 Hz, internally switchable.
Meyer Sound P-1A — buyer FAQs
What is the Meyer Sound P-1A and what is it designed to do?
The Meyer Sound P-1A is a single-channel control electronics unit built specifically to operate with the Meyer Sound UPM-1 loudspeaker. It provides factory-aligned frequency and phase response circuitry, including six stages of complementary phase equalisation, and houses Meyer's SpeakerSense driver protection, which continuously monitors power applied to the UPM-1 drivers and applies RMS and peak limiting only when safe operating limits are exceeded.
What connections and controls does the P-1A provide?
The P-1A offers balanced inputs and outputs via 3-pin XLR and quarter-inch RTS phone jacks, and a banana jack sense input for the SpeakerSense circuit. Front-panel controls include a level control, an AC on/off switch and a lo-cut switch. Power is 120/240V AC at 50/60 Hz, switchable internally, making the unit usable in different regions.
What input and output specifications does the P-1A carry?
The P-1A accepts a balanced active input at 47k ohms and provides a push-pull active output at 200 ohms source impedance. Maximum input/output level is above plus 20 dBu unbalanced and above plus 26 dBu balanced. Hum and noise sits below minus 90 dBV and dynamic range exceeds 105 dB. Status LEDs indicate sense activity, limiting and power on.
Who makes the P-1A and where does it fit in their product range?
The P-1A is made by Meyer Sound Laboratories, an American professional audio company founded in 1979 and based in Berkeley, California. The company is known for loudspeakers, line arrays, subwoofers and audio control systems across sound reinforcement and fixed installation. The P-1A sits at the system-electronics level, serving as the dedicated control and protection companion to the UPM-1 loudspeaker rather than a standalone signal processor.
What should a buyer check when purchasing a used P-1A?
Because the P-1A is factory-aligned to the UPM-1, buyers should confirm all three status LEDs (sense, limit and power) function correctly and that the SpeakerSense banana jack connections are undamaged. Check the internally switchable 120/240V AC voltage setting matches the intended region. Used units on 10K Used carry a 21-day warranty covering major functional faults; full details are in the buying guide at 10kused.com/used-av-equipment-guide/.
