Fountek FM135D-II
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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.
| 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 |
