Laid back DAC under $800?

Op,

What is the rest of your system? Perhaps there is another solution that may make sense without losing detail?

I suffer from hyperacusis also.It definitely takes careful matching of components and wire to retain detail painlessly.A tubed dac or preamp may be something to consider.Detail without the harshness can be had by experimenting with different tubes.

If your preamp or integrated has some EQ you could dial the treble down a bit.

FLAC > Roon> Raspberry Pi> DAC> Jolida 1501 hybrid amp>Onix RS750 speakers (soon to be updated).

You can do some EQ in roon, that's where I would start.