Lowther - Drive Units

The Lowther PM (Permanent Magnet) series of high efficiency drive units were designed for use in horn-loaded cabinets. They were introduced in 1947 and most models from the range are still manufactured by Lowther today.

The drive units use Alnico magnets of varying flux density and employ 6-inch twin-cone diaphragms rated at 15ohms. Earlier drive units used rubber back and front suspensions surrounds, while later versions used foam surrounds.

Click on the model name or photo in the following table for more details on each drive unit:

Date Introduced Model Original Price Photo
1947 PM1A £32-0s-0d Lowther PM1A
c1949 PM2A £30-0s-0d to £40-0s-0d Lowther PM2A
1950 PM4 £48-0s-0d Lowther PM4A
1954 PM3A N/A Lowther PM3A
1956 PM6A £18-18s-0d Lowther PM6A
1967 PM7A £28-0s-0d Lowther PM7A
1972 PM3/5A N/A Lowther PM3/5A
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