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Scan-Speak 18W/8542-00

Pair of Scan-Speak 18W/8542-00 18cm woofers

Scan-Speak 18W/8542-00 is the last model from the Classic series in current production, used the famous Nylonfiber Paper Cone. It is well known to the audiophiles as the midwoofer driver of the legendary ProAc Studio 100 loudspeakers.

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 Magnesium Alloy   Parameter Measured Datasheet
Membrane material Air Dried Paper/Nylon Fibre Fs 30Hz 36 Hz
Magnet System Ferrite Re 6.6 Ω 6.6 Ω
Surround Coated Foam Qms 1.7 1.7
Voice Coil Diameter 42 mm Qes 0.26 0.32
Nominal Impedance 8 Ω Qts 0.32 0.27
Sensitivity 89 dB/W/m   Vas 47.9 ltr 39 ltr
Rated Power 70W Le 0.2 mH 0.2 mH

Scan-Speak 18W/8542-00 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

Scan-Speak 18W/8542-00 Second, Third and Fourth Harmonic in 18 ltr sealed box

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

Scan-Speak 18W/8542-00 Burst decay Responce at 1m in 38 ltr sealed box

Burst decay response, measured at 1m on axis

Scan-Speak 18W/8542-00 Cumulative Spectral Decay in 18 ltr seled box

The Cumulative Spectral Decay


An excellent driver with smooth frequency response usable up to 2,5 KHz, suitable for small bookshelf-sized boxes or three-way systems as a midrange.

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