| http://www.w3.org/ns/prov#value | - The best solution is probably to calibrate the test using a regular DVM. Be sure to use a test signal < 400 Hz as common DVMs often do not have anything like flat frequency response above that.(2) OUTPUT IMPEDANCE - Anything designed for driving headphones including PC's, portable players, headphone amps, USB headphone DACs, audio interfaces, pro gear, etc. has an output impedance.
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