Just sent my 360 back to Keith for the "reference" upgrade. I have had all his preamps and the 360 ESP (soon to be reference) are really special. It's my end point with the M2 mono blocks.
Just go my 360 pre amp back from Keith for the "reference" upgrade from "esp". Again, after my initial listening it was more open and spacious. If you have the esp but not the "esp/ref" I would recommend the upgrade since it will probably be the final upgrade for this pre amp.
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