Lowther A55 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 82 Hz
Emission Piston Area Sd 0.01055M²
Equivalent Volume Suspension Vas 4.254 Ltrs
Suspension Compliance Cms 269.166 u M/N
Mass of Cone Mmd 7.0 g
Mass of Moving Parts Mms 7.623 g
Force Factor Bl 9.712 T-M
Mechanical Q Factor Qms 5.831
Electrical Q Factor Qes 0.384
Total Q Factor Qts 0.360
Voice Coil Inductance @ 1 kHz Le 114.819 uH
Reference Efficiency No 1.471%
Sound Pressure Level SPL 93.694 Db
Overall Diameter 17.4 cm
Overall Depth 11 cm
Depth from rear of Mounting Frame 10,1 cm
PCD Mounting Centres 15.6 cm
Baffle Hole cut-out 13.7 cm
Magnet Ring Diameter 9.7 cm
Voice coil diameter 3.9 cm
Voice coil impedance (nominal) 8 ohm
Air gap width 1 mm
Air gap height 5 mm
Magnet type Alcomax 3
Flux density (I Tesla=10,000 Gauss) 1.98 Tesla
Diaphragm Twin Paper
Frequency response 30 Hz-22kHz
Maximum voice coil travel ± 1 mm
Shipping weight 4 kg
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