I'd like to find a low-key town/city for Semana Santa. I've attended the processions in Málaga and Sevilla and would like to try a new venue.

Any suggestions?

Ferrol.
Junta General de Cofradías y Hermandades ? Semana Santa de Ferrol

Thanks for the suggestion, Ribeirasacra. That looks interesting. I'll look into it. I have not been to that part of Spain, and I'd like to explore it.

We've been to Burgos for Semana Santa, smaller and intense, but different then what you've experienced in Sevilla and Málaga, and it was rather cool in the evening. We've also been to Madrid, Úbeda and Ronda during Holy Week. Each has it's own flavor. They also celebrate Semana Santa in the Basque Country and Navarra with some intensity, but only in San Vicente de la Sonsierra and Zamora have we encountered the really serious penitents.