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Lowther PM7 A Series high efficiency fullrange
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.
NOTES:
(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.
Technical characteristics:
Voice coil DC resistance Re 7.4 ohms
Free air resonance Fo 45 Hz
Piston emission area Sd 0.021M²
Equivalent volume suspension VAS 55,907 liters of l
Compliance Suspension Cms 892.762u M/N
Cone Weight Mmd 11.0g
Weight of Moving Parts mms 12.75 g
Force factor Bl 9.106 T-M
Mechanical Q Factor Qms 4.338
Electrical Factor Q Q is 0.328
Total Q factor Qts 0.305
Voice coil inductance at 1 kHz Le 103.671 uH
Reference efficiency No 1.729%
SPL sound pressure level of 94,397 dB
Overall diameter 22.5cm
Overall depth 11.0cm
Depth of rear of mounting frame 10.1 cm
8" PCD Mounting Centers
Deflector Cutout hole 19 cm
Magnet ring diameter 9.7 cm
Coil diameter 3.9 cm
Voice coil impedance (nominal) 8 or 15 ohms
Air gap Width 1 mm
5mm air gap height
Magnet type Alcomax 3
Flux Density (I Tesla = 10,000 Gauss) 1.95 Tesla
Twin paper diaphragm
Frequency response 30Hz-20kHz
Maximum voice coil displacement ± 1 mm
Shipping weight 4.0kg
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