MSB vs dCS Bartok

Rfc - 

Very little will be as dynamic and punchy as what you had . . . 

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

1) Give it some more time to break in

2) Get a second Discrete power supply. It makes a difference. If you have the money, Powerbase is best

3) Always use a preamp (or an Integrated Amp with a good preamp stage). A DAC is not a preamp, regardless of what they say

4) Everything is user dependable. Not everyone likes the same thing. MSB may or may not be what you like

Good luck, and enjoy the journey 

A DAC is not a preamp, regardless of what they say

Sorry but this need correcting and is a furphy ( https://en.wikipedia.org/wiki/Furphy ), the output stage on most dacs today (except tube ones) is every bit as good as a preamps output stage sometimes even better, as in the MSB case.

Cheers George

Sorry George, my experience has been different. And I actually own MSB

As for output settings. It should be set to “high” when not using a preamp or integrated amp. From the manual:

Output (Output Level)

Low
• -6dB output level with a 150Ω output impedance. This setting is
recommended if you decide to use an external preamp

High (Default)
• Standard output level with a 300Ω output impedance

It may simply be that the OP does not like how MSB sounds. Which is perfectly normal. I am not a fanboy. We all like what we like. Cheers!