The C series utilize a ceramic magnet. These produce a "softer" magnetic field, resulting in a softer sound. These give a more distant perspective to the soundstage, but still provide a very transparent, dynamic sound. A low cost entry to the Lowther sound, and great for people who like to listen to older, less than perfect recordings, but who still want the transparency that a high quality driver can present.

The PM6C is the smaller, less efficient driver. The PM2C is its big brother. A 5" driver, the C45, shares the same magnetic motor as the PM6C

Pricing:

PM6C $595
PM2C $695
C45 $595