Auio Research

Has anyone heard the Audio Research DSPre or the McIntosh C-50?
Looking for a good Preamp-DAC
I own the Mac C-50. I love it.The internal dac according to McIntosh upsamples everything to 32/192 which I find is inferior to my Wadia X-64 dac.The Mac imho loses high and low frequency details Sounds very soft almost veiled.But it does excel in the mids on vocals.Hope this helps.