The Fountek FM135D-II is a 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.
FEATURES
- Aluminium cone - excellent transients
- Non resonant diecast chassis
- 35 mm CCAW voicecoil
- High compliance rubber suspension
- Kapton voice coil former
- Smooth frequency response
- Neodymium magnet system
SPECS:
Resonant frequency (fs) |
73 Hz |
Nominal impedance (Zn) |
8 Ω |
Mechanical Q factor (Qms) |
1.84 |
DC resistance (Re) |
6 Ω |
Electrical Q factor (Qes) |
0.69 |
RMS power handling |
30 W |
Total Q factor (Qts) |
0.28 |
Sensitivity (2.83V/1m) |
89 dB |
Equivalent volume (Vas) |
6.47 L |
Chassis diameter |
150 mm |

