Isophon PSL 320/400 GJW

This chassis is the standard PSL 320 / 400, but was subjected to a special treatment by Guido J. Wasser. Here, the magnet and the membrane were significantly modified. This special model was used in several loudspeaker projects. Among them are the SARDEC CH-2 and CH-3. The single driver was sold at that time for about 1000,- DM.

A short description of this driver is also available here with kind permission: