Repair Overview
Before you launch in to repairing your Spica's, there are a few things you need to know. Spicas were special for several reasons. Bau took great care in the original design of the crossover and ensuring time alignment. This is where most manufactures would have stopped. In traditional speaker production, the crossover would be modeled on a computer and then several prototypes would be built to work out the real world differences. Then production models would then fall with in a range, based on variances found in component values in production. A really good builder will go the next step and use close tolerance (1% - expensive) components to hold production models to a standard.
In Spica's case, less expensive components were used, but hand matched to ensure uniformity. However -- the really special part is that after doping, woofers were measured using a TDS spectrum analyzer and compared to a reference driver response to determine it's behavior. Woofers were individually graded for overall sensitivity, frequency, and magnitude of the response and assigned a service codes. Woofers were then mated to a corresponding crossover. This means to achieve the same level of quality when replacing drivers the service codes must match.
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