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"A" Series Drive Unit
Model Shown is PM4

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 "A" Series units are rated at 100 watts.
  3. We will be happy to answer any questions, (especially those of a technical nature) - either directly from Lowther Loudspeaker Systems in the UK or additionally via your authorised Lowther Club or Distributor if overseas.
ABRIDGED SPECIFICATIONS
PM6A PM7A PM2A PM5 PM4
PM6A Drive Unit PM7A Drive Unit pm2a Drive Unit PM5 Drive Unit PM4 Drive Unit
Overall Diameter 22.5 cm 22.5 cm 22.5 cm 22.5 cm 22.5 cm
Overall Depth 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
Baffle Hole cut-out 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
Voice coil impedance (nominal) 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
Flux density (I Tesla=10,000 Gauss) 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
Frequency response 30 Hz-20kHz 30 Hz-20kHz 30 Hz-20kHz 30 Hz-20kHz 30 Hz-20kHz
Nominal air resonance 36 Hz 36 Hz 36 Hz 36 Hz 36 Hz
Sensitivity at 1m/1kHz/1 watt 96 db 96 db 97 db 98 db 98 db
Maximum voice coil travel ± 1 mm ± 1 mm ± 1 mm ± 1 mm ± 1 mm
Shipping weight 4.0 kg 4.0 kg 6.0 kg 6.5 kg 10.0 kg
ABRIDGED SPECIFICATIONS
A45 A55
A45 Drive Unit A55 Drive Unit
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 (nominal) 8 ohm 8 ohm
Air gap width 1 mm 1 mm
Magnet type Alcomax 3 Alcomax 3
Flux density (I Tesla=10,000 Gauss) 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/1 watt 93 db 94 db
Maximum voice coil travel ± 1 mm ± 1 mm
Shipping weight 4.0 kg 4.0 kg

Please email us if you require any further technical information.

Despatch of drive units, ex-works, worldwide, is within 7 working days of receipt of payment.

Specifications subject to amendment without prior notice where design developments permit advancement.

Designed, made in England and distributed world-wide by:

LOWTHER LOUDSPEAKER SYSTEMS. P.O. Box 184, Sidcup, Kent DA14 4NL, ENGLAND.

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