Lowther DX-series

Thiele-Small parameters Lowther DX-series drive units

  Other Thiele-Small parameters can be found here: Lowther A-series, C-series, EX-Series

Lowther DX4 and Lowther DX55 "side by side"

        DX2   DX3   DX4   DX45   DX55
Overall diameter       22.5 cm   22.5 cm   22.5 cm   17.4 cm   17.4 cm
Overall Depth       7 cm   7 cm   8 cm   7.0 cm   7.2 cm
Depth from Rear of Frame       6.4 cm   6.6 cm   7.9 cm   6.4 cm   6.6 cm
PCD Mounting Centres       20.8 cm   20.8 cm   20.8 cm   15.6 cm   15.6 cm
Baffle hole cut-out       19 cm   19 cm   19 cm   14 cm   14 cm
Magnet Ring Diameter       7.6 cm   9.0 cm   9.0 cm   7.6 cm   9.0 cm
Voice coil diameter       3.9 cm   3.9 cm   3.9 cm   3.9 cm   3.9 cm
Voice coil impedance       8 or 15 ohm   8 or 15 ohm   8 or 15 ohm   8 or 15 ohm   8 or 15 ohm
Nominal Power Handling       100W   100W   100W   100W   100W
Emission piston area   Sd   0.021M²   0.021M²   0.021M²   0.021M²   0.021M²
Air gap width       1 mm   1 mm   1 mm   1 mm   1 mm
Air gap height       5 mm   5 mm   5.5 mm   5 mm   5 mm
Magnet type       Neodymium   Neodymium   Neodymium   Neodymium   Neodymium
Flux density       1.7 Tesla   2.0 Tesla   2.2 Tesla   1.7 Tesla   2.0 Tesla
Diaphragm       Twin-paper   Twin-paper   Twin-paper   Twin-paper   Twin-paper
Frequency response       30Hz-20kHz   30Hz-22kHz   30Hz-22kHz   80Hz-20kHz   80Hz-22kHz
Nominal air resonance       36 Hz   36 Hz   36 Hz   60 Hz   80 Hz
SPL at 1m/1kHz/1watt                  97 db   98 db   99.5 db   93 db   94 db
Maximum voice coil travel       ± 1 mm   ± 1 mm   ± 1 mm   ± 1 mm   ± 1 mm
Suspension compliance   Cms   994 uM/N   994 uM/N   994 uM/N        
Total Q Factor   Qts   0.246   0.247   0.249   0.326   0.320
Electrical Q Factor   Qes   0.22   0.22   0.22        
Mechanical Q Factor   Qms   3.11   3.11   3.11        
Equivalent Vol. Suspension   Vas   0.015M³   0.015M³   0.015M³   0.011M³   0.011M³
Effective Moving Mass Kg.       0.0115   0.0115   0.0115        
Shipping weight       2.0 kg   2.5 kg   3.0 kg   2.0 kg   2.5 kg

 

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