Lowther PM3A Sinfonia

Price per drive unit.

The PM3A Sinfonia offers an intriguing blend of finesse and function. Unlike its open-backed sibling the PM5A, this model employs the same Alnico motor but wraps it in a precision-engineered steel magnet casing. Often used historically for broadcast and studio installations where electromagnetic shielding was critical, this design now benefits home builders too - minimising external interference while shaping a tighter, more focused sonic presentation.

The enclosure acts as a mounting aid for specific cabinet types - especially those with rear chamber loading - and subtly influences the damping and field distribution around the magnet. The result is a smoother high-frequency decay, balanced dynamics, and 93dB* sensitivity that responds beautifully to refined low-watt amplification.

Ideal for applications where sound clarity must coexist with mechanical practicality - from nearfield listening spaces to complex horn enclosures - the PM3A Sinfonia remains a cult favourite among experienced builders.

*tested in clean air - cabinet design can increase efficiency further.

Warranty: 10 Years