Helix C1T

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.

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
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.