Hello roger friend, I use a "cheap" €52,00 Inductance Capacitance Meter by RANGE (RE6000) to measure coils and caps. You will spend a lot of money in xovers, sometimes more than in speakers to get it right. Thats why some factories sometimes don't mess with that, or the speaker(s) goes over (many)$1.000,00 USD. Be careful. After all it's our pleasure not theirs. dB, I am from Portugal.