I think you'll find the ARC/Mac combo to be a bit more transparent. It will change the character of your sound. If you like the Mac sound, complete the circle and go Mac. If you think you need a bit more bloom and transparency, go ARC. When I added an ARC pre to a Mac amp, I liked what I heard so much, I bought an ARC amp. Completely different sound which I now greatly prefer. Your opinion may differ.
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