Lowther PM4 high efficiency fullrange
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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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