I think using a combination of test tones to test any audio equipments are wrong and irrelevent. Human voices or any other musical instruments produce sound that are more complex than the simple test tones.
I believe the ultimate testing of any audio equipments are by comparing the real thing(be it a human vocal or any musical instrument) to the reproduction. If it sounds real, then it is more accurate. Very simple....
I believe the ultimate testing of any audio equipments are by comparing the real thing(be it a human vocal or any musical instrument) to the reproduction. If it sounds real, then it is more accurate. Very simple....