The Crosby Mod was perhaps the most well known production period mod to the TC-50. Crosby was a "A High End Audio Specialist" located in Hobbs, New Mexico. They were well know for modifying a variety of gear, but perhaps best known for their Quad ESL modifications... (more)
Site includes a Technical review along with the measurement, analysis and restoration of two sets of SPICA TC-50 Loudspeakers by Basel Audio Lab.
Project includes tweeter replacement and crossover updates by Carl's Custom Loudspeakers.
Project photos and notes by member of the the Spica Speaker Users Group
Good Design / Bad Design and DYI
Designing and making things and do it yourself, mostly Audio