Toga , I checked the figures on the ARC Ref40 and it shows output impedance as 600 ohms, the input impedance of the Mephisto is 20kohms . I am using the Wavac Prt-1 pre amp with a similar output impedance to drive the Vitus - ss101mk2 which has an input impedance of 10kohm, to feed a Marten Coltrane 2 . I find no lack of deep bass or other compatibility problems . Mind you the XLR outputs of the WAVAC are transformer coupled and so may be a factor in my case . Best would be to try the pairing at home , I have an inkling that it should work . The only off putting aspect of the Mephisto to me , is the use of dual power cords , all adds up if you are using top line stuff , as will most probably be the case .
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