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Lowther PM4


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Lowther PM4 high efficiency fullrange

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1 309,32 € tax incl.

-130,68 €

1 440,00 € tax incl.

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Lowther Loudspeaker Drive units are for use where only the finest standards of sound reproduction will satisfy. Their unique design and performance are world famous. Only the finest proven materials and micro-precision techniques are used in their production.

 The 'A' Series range maximises design potential enabling Lowther quality to be enjoyed in systems using single drive units to multi-unit assemblies such as Lowther's incomparable horn-loaded designs.


(1) Suitably housed, multi-unit assemblies do not necessarily require passive cross-over systems between bass, mid and high frequency units.
(2) All units are rated at 100 Watts.

DC Resistance of Voice Coil     Re     7.4 ohms
Free Air Resonance     Fo     45 Hz
Emission Piston Area     Sd     0.021M²
Equivalent Volume Suspension     Vas     60.489 Ltrs
Suspension Compliance     Cms     965.934 u M/N
Mass of Cone     Mmd     11.0 g
Mass of Moving Parts     Mms     12.75 g
Force Factor     Bl     12.511 T-M
Mechanical Q Factor     Qms     3.75
Electrical Q Factor     Qes     0.172
Total Q Factor     Qts     0.164
Voice Coil Inductance @ 1 kHz     Le     23.178 uH
Reference Efficiency     No     3.176%
Sound Pressure Level     SPL     97.038 Db

Overall Diameter     22.5 cm
Overall Depth     15.5 cm
Depth from rear of Mounting Frame     14.2 cm
PCD Mounting Centres     20.8 cm
Baffle Hole cut-out     19 cm
Magnet Ring Diameter     12.8 cm
Voice coil diameter     3.9 cm
Voice coil impedance (nominal)     8 or 15 ohm
Air gap width     1 mm
Air gap height     5 mm
Magnet type     Alcomax 3
Flux density (I Tesla=10,000 Gauss)     2.4 Tesla
Diaphragm     Twin Paper
Frequency response     30 Hz-20kHz
Maximum voice coil travel     ± 1 mm
Shipping weight     10 kg



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Lowther PM4

Lowther PM4

Lowther PM4 high efficiency fullrange