A Series

All units are rated at 100 Watts.
Suitably housed, multi-unit assemblies do not necessarily require passive cross-over systems between bass, mid and high frequency units. We reserve the right to vary the specifications and designs without prior notification. Despatch of drive units, ex-works, worldwide, is normally within 28 working days of receipt of payment.
Specifications

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.

The A Series range utilises the extremely large and powerful magnet assemblies for which Lowther has always been renowned.

The model shown to the left is the well known PM4A

 PM2APM4APM5APM6APM7AA45A55
Datasheet
Overall diameter22.5 cm22.5 cm22.5 cm22.5 cm22.5 cm17.4 cm17.4 cm
Overall depth13.0 cm15.5 cm13.0 cm10.5 cm11.0 cm10.5 cm11.0 cm
Depth from rear of Mounting Frame11.0 cm14.2 cm11.0 cm9.6 cm10.1 cm9.6 cm10.1 cm
PCD mounting centres20.8 cm20.8 cm20.8 cm20.8 cm20.8 cm15.6 cm15.6 cm
Baffle hole cut-out19.0 cm19.0 cm19.0 cm19.0 cm19.0 cm13.7 cm13.7 cm
Magnet Ring diameter11.5 cm12.8 cm11.5 cm9.1 cm9.7 cm9.1 cm9.7 cm
Voice coil diameter3.9 cm3.9 cm3.9 cm3.9 cm3.9 cm3.9 cm3.9 cm
Voice coil impedance (nominal)8 or 15 Ω8 or 15 Ω8 or 15 Ω8 or 15 Ω8 or 15 Ω8 or 15 Ω8 or 15 Ω
Air gap width1.0 mm1.0 mm1.0 mm1.0 mm1.0 mm1.0 mm1.0 mm
Air gap height5.0 mm5.0 mm5.0 mm5.0 mm5.0 mm5.0 mm5.0 mm
Magnet typeAlcomax 3Alcomax 3Alcomax 3Alcomax 3Alcomax 3Alcomax 3Alcomax 3
Flux density (1 Tesla=10,000 gauss)2.1 Tesla2.4 Tesla2.3 Tesla1.8 Tesla1.9 Tesla1.8 Tesla1.9 Tesla
DiaphragmTwin paperTwin paperTwin paperTwin paperTwin paperTwin paperTwin paper
Frequency response30 Hz-22 kHz30 Hz-22 kHz30 Hz-22 kHz30 Hz-22 kHz30 Hz-22 kHz80 Hz-20 kHz80 Hz-20 kHz
Maximum voice coil travel∓ 1 mm∓ 1 mm∓ 1 mm∓ 1 mm∓ 1 mm∓ 1 mm∓ 1 mm
Shipping weight6.0 kg10.0 kg6.5 kg4.0 kg4.0 kg4.0 kg4.0 kg