I was on another audio forum and a few people are having issue with the Persona C tweeter/mid crossover when they went to measure and had to send it in for warranty repair. I am still waiting on mine to arrive and figured it might not be a bad investment to look at a calibrated mic I can use for testing at home. I was looking at the UMIK-1 (backorder) Umik-2 (expensive) overkill? Was curious what other might be using to measure their speakers?