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 $795
PM2C $950
C45 $795
Pricing is per pair, shipping to Continental US is $25. Write for shipping quotes outside the Continental US. I cannot ship to countries having their own Lowther Club