Amphion One25A – Active 3-Way Full-Range Studio Monitor
 
The Amphion One25A is a flagship active studio monitor that represents the pinnacle of Amphion’s 25-year journey in acoustic innovation, signal purity, and uncompromising craftsmanship. Designed for top-tier music production, mixing, and mastering environments, the One25A combines all the advantages of active monitoring with none of the typical compromises.
Key Features:
Exceptional Translation & Confidence in Mixing
With industry-leading accuracy and imaging, the One25A helps audio professionals make confident decisions, reduce revision times, and improve workflow efficiency—ensuring your mixes translate effortlessly across all playback systems.
Pinpoint Imaging with Natural Phase Coherence
The One25A offers razor-sharp imaging and natural depth, thanks to Amphion’s phase-coherent design and refined crossover topology. Hear width, height, and depth exactly as recorded.
Pure, Uncolored Signal Path
Unlike many active monitors, the One25A avoids DSP and unnecessary AD/DA conversion stages. This clean analog path preserves every nuance of your audio, ensuring maximum resolution and musicality.
Isolated Driver Chambers for Enhanced Clarity
Each midrange and tweeter driver is housed in an independent sealed chamber, isolating them from low-frequency pressure interference. The result is extraordinary mid and high-frequency detail, revealing every subtlety in your mix.
Acoustic Symmetry & Advanced Waveguide Design
The acoustically symmetrical baffle ensures a smooth, balanced frequency response and improved imaging. Amphion’s proprietary 5th generation U/D/D (Uniformly Directive Diffusion) technology further refines driver integration and in-room performance.
Removable External Amplifier Module
To eliminate interference and vibration, all electronics are housed in a rugged external steel Amp Pack. This removable unit enables easy soffit mounting and keeps critical components thermally and mechanically isolated from the cabinet.
Sealed Dual-Cabinet Construction
The One25A’s sealed dual-cabinet design with optimized internal bracing controls enclosure resonance and enhances clarity and transient response. The structure functions as both a stiffener and an energy dispersion mechanism.
Soffit-Mount Ready
Thanks to its sealed design and external amplifier, the One25A is ideal for flush soffit mounting in high-end studio environments.
Customizable Boundary Control
Adapt your monitoring setup to any room with One25A’s 8-step boundary control system, offering precise low-frequency tuning (+/- 7 dB at 20 Hz) using a gentle shelving curve under 150 Hz.
Smart Overload Protection
An intelligent, transparent protection circuit guards the speakers from overload without interrupting playback—ensuring uninterrupted workflow even during critical sessions.
 
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 H x W x D - 316 x 510 x 488 mm; 12.44″ x 20.08″ x 19.2″
Without amplifier - 316 x 510 x 427 mm; 12.44″ x 20.08″ x 16.8″
Woofer suspension protrudes out 12 mm / 0.47″
Weight - 41 kg (90.4 lbs)
Handmade in Finland