In reading the forum threads on the Clarinet I see that C302 is usually unnecessary, so I bypassed it on mine after determining that my sources do not exceed 0.1 V DC.
So hypothetically, what would happen if a source that exceeded this limit were to be connected? Would it damage the Clarinet? I assume that C303 would keep it from getting through to a power amp, so this should prevent damage further downstream (like my speakers)....right?