rocray,
I generally run my DAC straight into the amplifier. I do have the Schiit Freya, Elkit TU-8500DX, and DIY Wayne's BA2018 preamps that I have tried with the GaN 400 etc. but generally I find I like the sound straight from the DAC better. I mostly use the SMSL SU-9 but I also have the Denefrips Ares II and I find it very difficult to hear a difference between them although the Ares II does sound a touch better but the convenience of the SU-9 really tops any sonic difference. The Elekit TU-8500DX does give the GaN 400 wonderfully liquid vocals but I seem to lose that holographic soundstage when I use a preamp.
I generally run my DAC straight into the amplifier. I do have the Schiit Freya, Elkit TU-8500DX, and DIY Wayne's BA2018 preamps that I have tried with the GaN 400 etc. but generally I find I like the sound straight from the DAC better. I mostly use the SMSL SU-9 but I also have the Denefrips Ares II and I find it very difficult to hear a difference between them although the Ares II does sound a touch better but the convenience of the SU-9 really tops any sonic difference. The Elekit TU-8500DX does give the GaN 400 wonderfully liquid vocals but I seem to lose that holographic soundstage when I use a preamp.