HELIX Ci5 M50FM-S3

Power handling RMS / Max. P

70 / 100 Watts

Impedance Z 3 Ω

DC resistance Re 3.1 Ω

Frequency response 300 Hz - 20,000 Hz

Resonance frequency Fs 240 Hz

Mechanical Q factor Qms 3.09

Electrical Q factor Qes 0.80

Total Q factor Qts 0.68

Compliance Cms

300 µm/N



Equivalent air volume Vas 0.16 L

Force factor B*I 2.8 Tm



Sensitivity SPL 89 dB @ 2.83 V / 1m

85 dB @ 1W / 1m

Cone area Sd 19.6 cm²

Moving mass Mms 1.43 g

Cone material Silicon coated paper cone

Mechanical resistance Rms 0.71 kg/s

Voice coil diameter ø 20 mm

Voice coil winding height 7 mm

Max. linear excursion Xlin +/- 2.5 mm

Max. mechanical excursion Xmax +/- 3.5 mm

Outer diameter ø 59.8 mm / 2.34″

Outer diameter with universal mounting ring ø 70.0 mm / 2.75″

Installation diameter ø 50.9 mm / 2.00″

Installation depth 25.2 mm / 0.99″

Features Powerful push-pull neodymium magnet system, FlexMount50



Compatibility: FlexMount50



Scope of delivery

2 x Ci5 M50FM-S3

2 x Universal FlexMount CFM50 MULTI.1

2 x Speaker gasket

2 x Mounting ring with grille

1 x Mounting material