Lowther Loudspeaker Systems Ltd.

Where Technology Becomes "Live" Music

 

'A' Series Drive Units


 

"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.

 


 

SPECIFICATIONS (for Thiele Small Parameters, please click on the appropriate link or picture below)
PM7A PM2A PM5 PM4
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
Overall Depth 11.0 cm 13.0 cm 13.0 cm 15.5 cm
Depth from rear of Mounting Frame 10.1 cm 11.0 cm 11.0 cm 14.2 cm
PCD Mounting Centres 20.8 cm 20.8 cm 20.8 cm 20.8 cm
Baffle Hole cut-out 19 cm 19 cm 19 cm 19 cm
Magnet Ring Diameter 9.7 cm 11.5 cm 11.5 cm 12.8 cm
Voice coil diameter 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
Air gap width 1 mm 1 mm 1 mm 1 mm
Air gap height 5 mm 5 mm 5 mm 5 mm
Magnet type Alcomax 3 Alcomax 3 Alcomax 3 Alcomax 3
Flux density (I Tesla=10,000 Gauss) 1.95 Tesla 2.1 Tesla 2.3 Tesla 2.4 Tesla
Diaphragm Twin Paper Twin Paper Twin Paper Twin Paper
Frequency response 30 Hz-20kHz 30 Hz-20kHz 30 Hz-20kHz 30 Hz-20kHz
Maximum voice coil travel ± 1 mm ± 1 mm ± 1 mm ± 1 mm
Shipping weight 4.0 kg 6.0 kg 6.5 kg 10.0 kg

 


 

SPECIFICATIONS (for Thiele Small Parameters, please click on the appropriate link or picture below)
PM8 PM6A A45 A55
PM8 Drive Unit PM6A Drive Unit A45 Drive Unit A55 Drive Unit
Overall Diameter 22.5 cm 22.5 cm 17.4 cm 17.4 cm
Overall Depth 10.5 cm 10.5 cm 10.5 cm 11.0 cm
Depth from rear of Mounting Frame 9.6 cm 9.6 cm 9.6 cm 10.1 cm
PCD Mounting Centres 20.8 cm 20.8 cm 15.6 cm 15.6cm
Baffle Hole cut-out 19 cm 19 cm 13.7 cm 13.7 cm
Magnet Ring Diameter 9.7 cm 9.1 cm 9.1 cm 9.7 cm
Voice coil diameter 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 ohm 8 ohm
Air gap width 1 mm 1 mm 1 mm 1 mm
Air gap height 5 mm 5 mm 5 mm 5 mm
Magnet type Alcomax 3 Alcomax 3 Alcomax 3 Alcomax 3
Flux density (I Tesla=10,000 Gauss) 1.8 Tesla 1.75 Tesla 1.75 Tesla 1.98 Tesla
Diaphragm Twin Paper Twin Paper Twin Paper Twin Paper
Frequency response 30 Hz-20kHz 30 Hz-20kHz 80 Hz-20kHz 80 Hz-22kHz
Maximum voice coil travel ± 1 mm ± 1 mm ± 1 mm ± 1 mm
Shipping weight 4.0 kg 4.0 kg 4.0 kg 4.0 kg

 

Please email us if you require any further technical information.

 


 

Despatch of drive units, ex-works, worldwide, is normally within 10 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.