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Fountek FM135D-II Midrange Drive Unit

Fountek FM135D-II Midrange Drive Unit.

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5¼" / 135mm midrange driver featuring an aluminium cone, a rigid diecast basket and a high temperature copper clad aluminium voice coil wound on a 35mm kapton former.

Operates as a pure piston between 120 - 400Hz then the response gently tapers upwards to 5Khz, our recommended upper limit for this unit. As to be expected with a small metal coned drive unit, the FM135D-II has an excellent transient response. The first major cone breakup occurs at around 7Khz, this is easily avoided or notched in the crossover.

Key Features:

  • Aluminium cone - excellent transients
  • Non resonant diecast chassis
  • 35.5mm CCAW voice coil
  • High compliance rubber suspension
  • Kapton voice coil former
  • Smooth frequency response
  • Low distortion

Basic parameters:

Resonant frequency (fs) 73 Hz Nominal impedance (Zn) 8 Ω
Mechanical  Q factor (Qms) 1.84 DC resistance (Re) 6.3 Ω
Electrical Q factor (Qes) 0.69 RMS power handling 30 W
Total Q factor (Qts) 0.28 Sensitivity (2.83V/1m) 89dB
Equivalent volume (Vas) 6.47L Chassis diameter (cropped) 150 mm