Lowther EX Series

The new EX series of drive units will completely transform all existing Lowther Loudspeaker Systems. Every Lowther Owner may now enjoy the greatly superior sound reproduction qualities which only the 'EX' drivers are capable of. Each model in the 'EX' range incorporates an acoustic chamber precisely tuned for optimum performance. Cone assemblies are pressure balanced between the acoustic chamber at the rear and a phasing equalizer fitted to the front. No unwanted oscillations of the speech coil occur. Only bass frequencies will pass through the acoustic chamber, so avoiding bass/mid-range confusion, often a cause of coloration.

    

[ A Series ]    [ C Series ]     [ DX Series ]
[ Speakers ]    [ Price List ]

SPECIFICATIONS
EX2 EX3 EX4
Overall diameter 23.2 cm 23.2 cm 23.2 cm
Overall Depth 8.5 cm 8.5 cm 8.5 cm
Depth from Rear of Mounting Frame 6.4 cm 6.6 cm 7.9 cm
PCD Mounting Centres 20.8 cm 20.8 cm 20.8 cm
Baffle hole cut-out 19 cm 19 cm 19 cm
Magnet Ring Diameter 7.6 cm 9.0 cm 9.0 cm
Voice coil diameter 3.9 cm 3.9 cm 3.9 cm
Voice coil impedance (nominal) 4, 8 or 15 ohm 4, 8 or 15 ohm 4, 8 or 15 ohm
Nominal impedance 8 ohm 8 ohm 8 ohm
Minimum impedance 7.2 ohm 7.2 ohm 7.2 ohm
Emission piston area 0.021M 0.021M 0.021M
Air gap width 900 microns 900 microns 900 microns
Air gap height 5 mm 5 mm 5.5 mm
Magnet type 'Hi-Ferric' Rare Earth Neodymium 'Hi-Ferric' Rare Earth Neodymium Hi-Ferric' Rare Earth Neodymium
Flux density (1 Tesla=10,000 gauss) 1.75 Tesla 2.1 Tesla 2.2 Tesla
Diaphragm Twin-paper Twin-paper Twin-paper
Frequency response 30 Hz - 20 kHz 30 Hz - 22 kHz 30 Hz - 22.5 kHz
Nominal air resonance 36 Hz 36 Hz 36 Hz
Sensitivity at 1m/1kHz/1watt 97 db 98 db 99 db
Maximum voice coil travel 1 mm 1 mm 1 mm
Suspension compliance 1.24x1.8mn-1 1.24x1.8mn-1 1.24x1.8mn-1
Total Q Factor 0.260 0.245 0.220
Electrical Q Factor 0.22 0.22 0.22
Mechanical Q Factor 3.11 3.11 3.11
Equivalent Volume Suspension 0.15M 0.15M 0.15M
Effective Moving Mass Kg. 0.0115 0.0115 0.0115
Shipping weight 3.0 kg 3.0 kg 3.5 kg

All drivers can be ordered with Silver Coils