Sometimes component compatibilty is an issue. For instance, some preamplifiers do not like to see a low (20K ohm or less) input impedance in the amplifier they try to drive. A poor match can result in poor sound, and incorrectly be ascribed to the component(s). One solution is to buy an amplifier with a high input impedance so almost anything can drive it, or buy a preamp that is very tolerant of driving low input impedances. What specifically do you have in mind?
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