Which DAC as a preamp?


Hi folks...I am looking for opinions regarding DACs to use as a digital pre-amp to drive my red dragon monoblocks. I am considering Audiolab MDAC plus, Musical Fidelity M6s DAC, NAD C-510, or the Audio Alchemy DDP-1.    Any thoughts as to which would be the best pick?
tfats
@hicksmore 

RCA coax is intended for digital signals. I suggest to try the M6S RCA analog output with simple analog RCA cables.




I've not heard the DACs listed by the OP. I've found the Sonnet Morpheus to be excellent driving my ATC SCM100ASLT active speakers.
If you look for a fully featured preamp and top DAC, look at Antelope in the used market. Zodiac Gold or Platinum are hard to beat
@shadorne

I'm referring to DAC input from streamer, not output to preamp. Output is balanced XLR to the preamp. Input is the RCA coax from the streamer (as of today).