2 come to mind. The second I would likely not have known about except that the Hattor dual mono passive pre with remote that I had did not come with a gain stage. I could order it, but I did not feel comfortable to do the install, so reluctantly, I sold it. BUT, I came across a Audio Alchemy DDP-1 (which has a built in DAC) for $895. It took about 4 months to track down the optional PS5 power supply $600, which was/is money well spent as it transformed it.
Prior to the Hattor, I had been using my Oppo 105 variable VC direct to amp for both CD and SACD. CDs sounded amazingly better through the AA dac, and the AA has XLR inputs, meaning CD and SACD are switchable via the remote
Had I kept the Hattor I would have gotten a DAC which would have cost as much as the AA, so win-win for me
hth
hth