C 2M
  • C921200
  • DE 29323089


These reference speakers in our C-series raise the bar to a new level of fantastic sound quality. The legendary sisal woofer cones are equipped with an additional structural damping layer made of an elastomer, which again improves the acoustic properties of the driver. The tweeter enclosure also underwent a complete overhaul. Anyone who wants to operate these loudspeakers as fully active speakers (e.g. using our new digital signal processors) can put together the system of their choice by combining the individual components.


  • Ultra lightweight silk dome for a distinguished and natural midrange response
  • Sturdy protection grille for protecting the dome from damages
  • 10 x drilled neodymium magnet for highest magnetic flux linearity
  • Integrated, dampened coupling volume for very low resonance frequency

Technical data

Power RMS / max.  P 40 / 80 Watts
(highpass > XX00 Hz at 12 dB/Oct.)
Impedance  Z 4 Ω
DC resistance  Re 3.4 Ω
Resonance frequency  Fs 460 Hz
Efficiency 1 W / 1 m SPL 93 dB
Voice coil diameter ø 50 mm
Cone area  Sd 20 cm²
Moving mass  Mms 1.6 g
Cone material   Silk dome
Outer diameter ø 90 mm / 3.54"
Installation diameter ø 78 mm / 3.07"
Installation depth   31.15 mm / 1.23"
Recommended crossover frequencies for the highpass  
Slope  Minimum crossover frequency
6 dB/Octave  1,250 Hz
12 dB/Octave   > 750 Hz
24 dB/Octave  > 650 Hz

Scope of delivery

2 x High-end midrange speaker HELIX C 2M
2 x Fitting spring
2 x Allen screw
1 x Allen key

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