PSI Audio A21-M Active Studio Monitor


Perfectly accurate mid field monitor


“This is one of only a few speakers that I have tested with this good a step response”

“Of particular note though is the remarkable step response, which is presumably helped by PSI Audio’s “Compensated Phase Response (CPR) system”. This accurate time response is very rare in this type of speaker but here, PSI Audio has proven that it is possible.”
Keith Holland, Resolution Magazine UK

Main Features

Power: 120 + 50W
Frequency Range: 38Hz – 23kHz
SPL Max: 108dB
100% Analog – No DSP
Flat frequency response
Phase compensated for a better stereo image
Class G Amplifier

individually calibrated
Typical listening distance: from 1.5 m
5 years warranty
Handmade in Switzerland
PSI Audio Sub A225-M and Sub A125-M front view

Extend the low frequencies and add power

Use one of PSI Audio’s Subwoofer / LFE to add more energy and low end to your A21-M:
– Our compact Sub A125-M
– our full range Sub A225-M

Thanks to our Roll-Off technology, both Sub A125-M & Sub A225-M are designed to perfectly match the A21-M.

A21-M – high power near to mid field precision monitor

The A21-M has unmatched impulse response and stereo image.
It is an astonishing monitor used for the most demanding sound productions and allowing the user to be in full control of all frequencies and sound image into the finest details.

Click on a picture to choose a product from our coherent range of monitors.

Technical Data & Documents

Power RMS:120 + 50W
Program Power:170W
Input Impedance:Sym, 10k Ohms
Sensitivity for 100 dB @ 1m:0.775 V
Signal to Noise Ratio:96 dBA
Continuous Max SPL@1m:108 dB (single)
Input Overload:24 Vpp
Program Max SPL@1m:119 dB (pair)
Response at -6dB:38 - 23000 Hz
Tolerances:±2 dB (44Hz - 20kHz)
Distortion THD:less than 1.4% (90Hz-12kHz)
Phase tolerances:±45° (190Hz - 20kHz)
Dispersion (P.N. 4 - 16 kHz) at -6 dB:90° x 90° (H x V)
System:2 Way(s)
Crossover frequency:2.4 kHz
Woofer's dim. Ext. / Diaphragm:Ø217 mm / Ø170 mm
Tweeter's dim. Ext. / Diaphragm:Ø100 mm / Ø25 mm
Connectors:1 x XLR F / 3P
Signal input:1=GND, 2=(+), 3=(-)
Dimensions W x H x D mm:250 x 400 x 300
Gross / Net Weight:14.5 / 13.2 kg
Voltage:115/230V (50-60Hz)
Consumption Standby-Quiescent-Max:1.2 - 5 - 150 W
Mean / Max Humidity:less than 75% / less than 90%
External Temperature:5 - 40°C

Each speaker is individually calibrated in our anechoic chamber and is delivered with its frequency response sheet.
A proof of quality.

On special request, we can customize your speaker with any RAL color.
Please ask us directly.

  • compact subwoofer A125-M
    add more power, more low end. Two A125-M perfectly match an A21-M pair.
  • subwoofer A225-M
    more low end (24Hz), more power for your A21-M setup.
  • gig bag
    are you travelling with your A21-M? our gig bag will perfectly protect them and you can easily carry 2 units alone. Handmade in USA.
  • grill protection
    are you using your A21-M in a public space, in broadcast use or at home? protect the tweeter and woofer with our adapted grill.
  • brackets
    do you need to use your A21-M suspended on a wall or on a fixation system? just add a bracket to fix them anywhere.

What our users say

The A21-M is the best monitor I’ve ever owned. It’s the perfect all-round monitor for mixing no matter which kind of music genres  in our studios. 
Ben Muehlethaler – B-Note Entertainment GmbH (