Only a brief comment about passive pre-amps and gain. Although passive, if they use transformers (TVC) they can add gain too. Typically +6 dB. And that is sufficiant in most applications.
Transformers can add voltage (gain) but only at the expense of current and add current (gain) at the expense of voltage. Because they are passive, no net increase in energy is possible.
Eandylee, I am now using my APL CD Player direct to my Pass Amp and it is better than when I used a Melos Preamp. Sound is purer. Plus, as was mentioned, I eliminated one power cord, interconnect, rack space .
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