rfc OP
Hi George, yes it’s set up with the “high output”
Then try the "low output" also hope it has enough volume level for you.
As if with the "high output" if you have to turn back the volume level too much, then this could be "bit striping" the digital resolution and could be what your hearing, a loss of resolution .
Just as Wadia says with their dacs direct to amp, max output level setting with dac volume controls. https://ibb.co/vqgv7kJ
If then on the low setting you find you don’t have enough level to go loud enough even full up, then you’ll either have to put in your Naim pre, or better still you could leave it on the "high output" setting, volume up and set at just a little below full (100?), so your not "bit striping" and then use a passive volume control between dac and amp to adjust your volume
Going direct is never easy, but if you get it right, you’ll be rewarded with the most transparent, dynamic, uncolored sound .
Cheers George