This audio version article from 1963 underscores the differences in opinions in assessing hi fidelity sound equipment and how it could be confusing for a consumer attempting to purchase hi fidelity equipment. It provides an interesting snapshot of decades old issues and arguments that still plague audio experts to this day.
Read the full article here:
Why Hi – Fi Experts Disagree (written in 1963).
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?