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Monacor SPH-300KE

Pair of Monacor SPH-300KE 12 inch woofers

SPH-300KE is the largest model of the Monacor Kevlar Series woofers. It has strong vented magnet system and cone made of real woven Kevlar.   

This is the manufacturer's brochure  Link To Pair of Monacor SPH-300KE Manufacturer's Datasheet

My Measurements

Driver Properties Thiele - Small Parameters
Chassis material Die Cast Aluminum Alloy    Parameter Measured Datasheet
Membrane material Kevlar  Fs 22.8Hz 22 Hz
Magnet System Ferrite Re 5.9 Ω 6.2 Ω
Surround Rubber  Qms 4.2 4.15
Voice Coil Diameter 65.5 mm Qes 0.35 0.36
Nominal Impedance 8 Ω Qts 0.32 0.33
Sensitivity 90 dB/W/m   Vas 182 ltr 250 ltr
Rated Power 120W Le 0.79 mH 1.5 mH

Monacor SPH-300KE SPL Responce at 1m on axis and 15 30 deg off axis

Frequency response at 1m with 2.83 V input RED - on axis, BLUE - 15 º off axis, GREEN - 30 º off axis

Monacor SPH-300KE Second, Third and Fourth Harmonic in 38 ltr sealed box

The second, third and fourth harmonic curves measured at 2.83V and 8V input RMS.

Monacor SPH-300KE Burst decay Responce at 1m in 38 ltr sealed box

Burst decay response, measured at 1m on axis

Monacor SPH-300KE Impedance in 38 ltr seled box

The impedance curve - free and in 38 ltr sealed box


This driver really has an excellent performance up to 2KHz (in this case a notch at 3300Hz is mandatory) and T/S parameters suitable for bassreflex cabinets.

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