think of it this way unless you have a dac used as a preamp
the preamp is the bridge between input and output so if you have a great dac or phono stage and a great amplifier if the preamp is not up to snuff you will dramatically curtail the systems overall level of performance
In general, in my system the preamp makes more of a difference probably because my speakers are a relatively easy load, but in another system it could be the exact opposite. In the end It really doesn’t matter — what matters most is that they’re balanced (one doesn’t clearly outclass the other) and that they compliment one another sonically. That’s been my experience anyway.
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