My understanding for impedance matching a preamp or upstream source having a volume control (e.g., a DAC with volume control) to a downstream amplifier is that an appropriate “impedance match” is for the amplifier to have an input impedance at least 20-fold to 50-fold greater that the output impedance of the upstream preamp or source output impedance. One dealer told me that the appropriate “impedance match” between to such components is exactly that—an identical match of the same impedances.
Tweak1, if one picks a sufficiently high impedance ratio, say 20-fold to 50-fold (or more), then one might cover all of the frequencies where the low impedance ratio is avoided.
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