Blumlein 88
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I don't see how this would not be the case. If an amp has cap input you have a filter there. I don't think there are very many cap coupled amps around however. For cap coupling the rule of thumb is to design the cap size so you get a filter at 2 hz. That way it has minimal effect on response from 20 hz and above. Here is what you get that way. Remember our ears do hear phase below 1500 especially between about 80 hz and 800 hz. So it really isn't surprising the 60 hz low cut is audible as it messes with phase up to more than 200 hz. I haven't tried to ABX the one shown below, but it likely is inaudible. Notice how much deeper the A wtd null is.
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