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A21-M Midfield Monitor

Perfectly accurate mid-field monitor
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The A21-M high power near / mid-field precision monitor covers a broad frequency spectrum, allowing the user to be in full control of their audio production. Its unique and highly optimized assets make it perfect for near, mid-field and surround sound applications where ultimate precision is required. The powerful bi-amplified output stages features the unique “AOI” output stages and has a protection circuit, which can be monitored via the red LED on the front panel.

The active crossover, with integrated “CPR”, gives the A21-M unprecedented impulse behavior – with excellent stereo imaging. The crossover is also optimized for maximum phase coherence, projecting a wide horizontal and vertical ideal listening area.
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The electronics are housed in a unit mechanically isolated from the speaker cabinet to avoid resonance at high sound pressure levels. Designed to work in harmony with the full range of A series monitors the A21-M also makes ideal front speakers in a surround sound setup, or can be developed in to a more powerful system by adding the A225-M sub – thus protecting your investment.

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: ≥ 1.5 m
  • 5 years warranty
  • Handmade in Switzerland
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"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

Frequency Response

Each speaker is individually calibrated in our anechoic chamber and is delivered with its frequency response sheet. A proof of quality.
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"You simply can't work with bad speakers, it’s pointless. The loudspeaker is the heart of music production, transporting audio so that it really gets into the ear. I use A21-M from PSI Audio and I am absolutely happy with it."

 – Boris Blank, Yello

Technical Data

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=(-)
Material:
MDF
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

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 or – 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 Broadcast.
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Available Colors

The A21-M Broadcast is available in Studio Red, Metal Black, or Pure White. On special request, we can customize your speaker with any RAL color. Please ask us directly.
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Options

  • Compact subwoofer A125-M – Add more power, more low end. A125-M perfectly matches an A14-M pair.
  • Subwoofer A225-M – More low end (24Hz), more power for your A14-M setup.
  • Gig bag – Are you travelling with your A14-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.
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 © 2025 Eleven Dimensions Media, LLC. All rights reserved.
  • ABOUT
  • PRODUCTS
    • Auro 3D Audio
    • BOME >
      • BOME Network Pro
      • MIDI Translator Pro
      • BOME Box
    • ESI Audiotechnik >
      • USB Audio Interfaces >
        • UGM192
        • MAYA22 USB
        • MAYA44 USB+
        • U24 XL
        • Gigaport eX
        • U22 XT
        • U22 XT cosMik Set
        • U86 XT
        • U108 PRE
        • U168 XT
        • Dr. DAC nano
      • Network Audio Interfaces >
        • planet22x
      • PCIe Audio Interfaces >
        • MAYA 44 eX
      • Mobile Accessories >
        • cosMik Lav
        • MIDI nTour CX
      • MIDI Interfaces >
        • MIDIMATE eX
        • M4U eX
        • M8U eX
      • Studio Accessories >
        • cosMik uCast
        • cosMik 10
        • eXtra 10
        • MoCo
      • Monitoring Speakers >
        • aktiv 05
        • unik 05+
        • unik 08+
        • aktiv 10s
    • LIVELOOP >
      • LIVELOOP
    • PEACH AUDIO >
      • CUBE 5
    • Ploytec >
      • PL2
      • AROMA
      • ONE.2
    • PSI Audio >
      • STUDIO MONITORS >
        • A14-M V3 Studio
        • A17-M
        • A21-M
        • A23-M
        • A25-M
        • A215-M
        • A214-M
        • A125-M
        • A225-M
      • ACTIVE BASS TRAPS >
        • AVAA C214
        • AVAA C20
        • AVAA TECHNOLOGY
      • Accessories >
        • R&B Router & Bass Management
        • Metal Grill & Brackets
        • Gig Bags
    • reProducer Audio Labs >
      • Epic 4 Nearfield Studio Monitor
      • Epic 5 Nearfield Studio Monitor
      • Epic 55 Midfield Studio Monitor
    • Teknosign >
      • BOX LINE >
        • PEQ – Parametric Equalizer
        • MVC – Vari-Mu Compressor
        • DSMP – Dual Solid State Mic Preamp
        • SSMP – Solid State Mic Preamp
        • RPS – BOX Line Power Supply
        • PPS – 48 Volt Power Supply
        • SAM – Sum Adjust Mini
        • DIA – Dual Active DI Box
        • DIP – Dual Passive DI Box
        • DPS – Dual Mic Splitter
        • HPA – Headphone Amp
        • HUB – High Power USB Hub
        • MNB – Mini AC Line Conditioner (USA)
        • MNB – Mini AC Line Conditioner (EU)
      • Summing Amplifiers >
        • Sum Adjust Classic
      • Automixer
      • Patchbays & Adapters
    • Ultramixer
    • Zynaptiq >
      • Zynaptiq Software Bundles >
        • CREATE Bundle
        • REPAIR Bundle
        • MASTER II Bundle
        • ZAP Bundle V
        • The Mac Audio Apps Bundle >
          • TRIUMPH
          • LOOP EDITOR
          • MYRIAD
          • SPECTRE
      • INTENSITY 2
      • BALANCE >
        • BALANCE - Mobile
      • PUNCH
      • PITCHSHIFT
      • PITCHMAP::Colors
      • ORANGE VOCODER nano
      • ORANGE VOCODER IV
      • ADAPTIVERB
      • WORMHOLE
      • MORPH 3
      • UNMIX::DRUMS
      • UNVEIL
      • UNFILTER
      • UNCHIRP
      • PITCHMAP
      • TIME FACTORY II
  • COMMUNITY
    • Product Reviews
  • BUY