Amphion One25A Pair

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Active 3-Way Studio Monitor

The One25A 3-way studio monitor is the culmination of our 25-year commitment to advanced acoustic design, pure refined signal path, and meticulous craftsmanship – enhanced with the benefits of active design without any of the downsides.

Industry leading translation

Trusting what you hear builds confidence, ensures better results and raises productivity. Amphion monitoring allows focusing on things that count which saves time and helps meet the ever tightening deadlines.

Pinpoint imaging

Due to their phase coherence and pinpoint imaging, Amphion monitors translate precisely to any playback device, as they allow you to correctly reproduce information in all planes including width, height, and depth.

Simple, refined signal path

Active speakers typically suffer from a lack of resolution due to their complex signal paths. The One25A is free of dynamics and detail-degrading DSP and AD/DA stages, which leads to maximum resolution and performance.

Isolated independent chambers

New midrange and tweeter are in an isolated sealed chamber which minimizes the bass woofer’s negative effects like pressure changes, leading to high midrange and treble resolution ensuring crystal clear transparency.

Acoustic symmetry

The baffle around the midrange is acoustically symmetrical, which leads to smooth frequency curve and precise imaging. Amphions proprietary 5th generation U/D/D improve driver integration and speaker performance in a room.

Removable Amp Pack

Placing the amplifier inside the monitor negatively interferes with moving elements. All the electronics of One25A are housed outside the cabinet in a rigid steel enclosure, which is also removable for soffit mounting.

Sealed dual cabinet

The internal bracing is designed both as a stiffening support structure as well as a physical energy dispersion filter. At the same time utilizing the mass of the sub-driver and how it is connected to the enclosure and bracing structure to control the resonance of the whole enclosure in a desired way.


  • Operating principle: Active, 3-way, sealed cabinet
  • Drivers:
    • 1″ titanium tweeter (new)
    • 5¼″ aluminium mid (new)
    • 10″ aluminium bass
  • Crossover points: 100 Hz / 2000 Hz
  • Amplifier power: Tweeter / Midrange 2x 205 W THD + N 0,002% | Bass 700 W
  • Frequency response: 22 – 55 000 Hz (-3dB)
  • Max SPL: 105 dB
  • Connections: Balanced XLR Input, 1x Female XLR, pin 2-hot
  • Mains: 230 V / 50 Hz or 115 V / 60 Hz (Factory preset)
  • Measurements: 316 x 510 x 487 mm
  • Weight: 41 kg / 91 lb
  • Handmade in Finland


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