C 1T
  • C921100
  • 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 treble response
  • Sturdy protection grille for protecting the dome from damages
  • 12 x drilled neodymium magnet for highest magnetic flux linearity
  • Integrated, dampened coupling volume for very low resonance frequency

Technical data

Power RMS / max.  P 100 / 150 Watts
(highpass > 3,000 Hz at 12 dB/Oct.)
Impedance  Z 4 Ω
DC resistance  Re 3.4 Ω
Frequency response   820 Hz - 25,000 Hz
Resonance frequency  Fs 820 Hz
Efficiency 1 W / 1 m SPL 90 dB
Voice coil diameter ø 25 mm 
Cone area  Sd 4.9 cm²
Moving mass  Mms 0.35 g
Cone material   Silk dome
Outer diameter ø 50 mm / 2.00"
Installation diameter ø 44 mm / 1.73"
Installation depth   20.5 mm / 0.81"
Recommended crossover frequencies for the highpass  
Slope  Minimum crossover frequency
6 dB/Octave  3,500 Hz
12 dB/Octave   > 2,500 Hz
24 dB/Octave  > 1,800 Hz

Scope of delivery

2 x High-end tweeter HELIX C 1T
2 x Fitting spring
2 x Allen screw
1 x Allen key

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