Active Monitor

SE MF-20

Monitoring at the Edge of Possibility | 

Developed from the advanced platform of the SE MF-2.1, the SE MF-20 represents STRAUSS ELEKTROAKUSTIK’s most uncompromising monitoring system to date. Originally conceived for scientific and psychoacoustic research applications, the system is built upon a compound system architecture designed to minimize non-linearities and mechanical energy storage.

This approach allows for a consistent focus on linearity, low distortion, wide bandwidth, and virtually unrestricted dynamic range. The result is a monitoring system capable of revealing the smallest spatial, tonal, and temporal structures within a recording while preserving a natural, coherent, and emotionally convincing musical presentation.

Compared to the SE MF-2.1, the SE MF-20 offers significantly lower harmonic and non-linear distortion, together with extended bandwidth and greater dynamic capability.

The SE MF-20 employs a two-way architecture with a low crossover frequency of 450 Hz, effectively achieving a point-source design with broad, homogeneous dispersion. Despite its scale and output capability, the system maintains exceptional spatial coherence, image stability, and consistency throughout the listening environment.

The system supports operation as both a QB3 bass reflex alignment and a sealed enclosure with a Qtc of 0.5, allowing low-frequency behavior to be adapted to the room, installation, and listening priorities of the user.



Available by custom order

Key Features

  • Dual 15” low-mid drivers with paper diaphragms
  • SE OEM underhung motor systems with large neodymium magnet assemblies
  • ±6 mm linear excursion
  • Compound enclosure system with QB3 bass reflex alignment and optional sealed alignment (Qtc 0.5)
  • 2” compression driver with axi-periodic diaphragm and underhung motor
  • 40 cm exponential horn with 4° inclination
  • Linearity +0 dB / –0.5 dB relative to target curve
  • Dedicated amplification for the low-mid and high-frequency sections
  • Continuously rising DI factor with frequency

Price per pair

$300,000.00
USD Pricing applicable to the U.S. market.
Shipping and taxes calculated at checkout.
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Technical Specifications

Drivers 2 × 15” low-mid drivers with paper diaphragms; 2” compression driver with axi-periodic diaphragm
Motor System SE OEM underhung motor with large neodymium magnet system; underhung motor for compression driver
Linear Excursion ±6 mm
Enclosure Compound system / BR: QB3; sealed as option with Qtc 0.5
Horn Exponential horn / 40 cm; horn inclination 4°
Amplifiers 2 × 250 W / 8 Ω for two 15” drivers; 1 × 120 W / 8 Ω for compression driver
Amplifier THD < 10 ppm / 1 W
Noise S/N > 100 dB / 1 W / 20 Hz – 20 kHz
Output Impedance < 10 mΩ at 20 Hz – 20 kHz
Sensitivity 93 dB / 1 W / 1 m
Compound System Sensitivity 90 dB / 1 W / 1 m
Power 500 W RMS / 8 Ω
Maximum Power 1200 W
Free-Field Frequency Response 20 Hz – 25 kHz (–3 dB)
Linearity +0 dB / –0.5 dB relative to target curve
THD Less than 0.2 % at 94 dB / 1 m / 100 Hz – 25 kHz
Nonlinear Distortion Compression less than 1 dB at 100 dB / 1 m / 20 Hz – 25 kHz
Crossover Frequency 450 Hz Linkwitz-Riley / 12–24 dB per octave
Dispersion Approx. 90° × 90° (–6 dB) at 500 Hz – 1 kHz; DI factor rises continuously with frequency
Dimensions H 1800 mm × W 560 mm × D 700 mm
Weight Approx. 180 kg / 400 lbs
The SE MF-20 leverages a compound system architecture to minimize non-linearities and mechanical energy storage, building upon the foundational research of the SE MF-2.1. By incorporating SE OEM underhung motor systems and maintaining constant voice coil magnetic flux, the design achieves significantly reduced harmonic distortion and superior transient precision. The 450 Hz crossover facilitates a coherent, virtual point-source wavefront, while the enclosure’s modular nature—supporting both QB3 bass reflex and sealed (Qtc = 0.5) configurations—enables surgical adaptation to the acoustic impedance of any critical listening environment.
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