Hi Terry, my MC452 works well with semi-DIY Bent Audio TapX with 4 silver autoformers (fully balanced). I have tried a few active preamps previously but prefer the transparency, higher resolution, tighter bass, and zero background noise of the passive autoformer preamp. Whether passive preamp will work or not depends on the source output voltage if it is sufficient to drive MC602 at regular listening level. In my case, the passive preamp attenuate around -30 to -20 dB most of the time.
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