Lowther A-series

Thiele-Small parameters Lowther DX-series drive units

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

Lowther PM5 and PM4 "side by side"

  PM6A PM8A  PM7A PM2A PM5 PM4
Overall Diameter 22.5 cm  22.5 cm 22.5 cm 22.5 cm 22.5 cm 22.5 cm
Overall Depth 10.5 cm  10.5 cm 11.0 cm 13.0 cm 13.0 cm 15.5 cm
PCD Mounting Centres 20.8 cm  20.8 cm 20.8 cm 20.8 cm 20.8 cm 20.8 cm
Baffle Hole cut-out 19 cm  19 cm 19 cm 19 cm 19 cm 19 cm
Voice coil diameter 3.9 cm  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 8 or 15 ohm
Air gap width 1 mm   1 mm 1 mm 1 mm 1 mm
Magnet type Alcomax 3  Alcomax 3 Alcomax 3 Alcomax 3 Alcomax 3 Alcomax 3
Flux density 1.75 Tesla   1.95 Tesla 2.1 Tesla 2.3 Tesla 2.4 Tesla
Diaphragm Twin Paper  Twin Paper Twin Paper Twin Paper Twin Paper Twin Paper
Frequency response 30Hz -20kHz  30Hz -20kHz 30Hz -20kHz 30Hz -20kHz 30Hz -20kHz 30Hz -20kHz
Nominal air resonance 36 Hz  36 Hz 36 Hz 36 Hz 36 Hz 36 Hz
Sensitivity at 1m/1kHz/1 watt 96 db 96 db  96 db 97 db 98 db 98 db
Maximum voice coil travel ± 1 mm  ± 1 mm ± 1 mm ± 1 mm ± 1 mm ± 1 mm
Shipping weight 4.0 kg  4.0 kg 4.0 kg 6.0 kg 6.5 kg 10.0 kg

 

  A45 A55
Overall Diameter 17.4 cm 17.4 cm
Overall Depth 10.5 cm 11.0 cm
PCD Mounting Centres 15.6 cm 15.6cm
Baffle Hole cut-out 14 cm 14 cm
Voice coil diameter 3.9 cm 3.9 cm
Voice coil impedance 8 ohm 8 ohm
Air gap width 1 mm 1 mm
Magnet type Alcomax 3 Alcomax 3       
Flux density 1.75 Tesla 1.98 Tesla
Diaphragm Twin Paper Twin Paper
Frequency response 80 Hz-20kHz 80 Hz-22kHz
Nominal air resonance 60 Hz 80 Hz
Sensitivity at 1m/1kHz/1Watt 93 db 94 db
Maximum voice coil             ± 1 mm ± 1 mm
Shipping weight 4.0 kg 4.0 kg

 

 

 Lowther A45 (top) and Lowther A55

 

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