Yes, you can find in on the website, the K-03x is also upgradable.
You might want to consider upgrading with a seperate dac.
I have come to a conclusion that the dac section of the 1 box esoterics are the biggest weakness, although they sound absolutely great.
I had the K-01, then the K-01x but have recently upgraded my dac.
Thinking that i do not play much cd's now, i had the intention to downside number of equipment as i do not want to add more rack space and let the K-01x go.
Connection the k-01x as a transport is really rewarding and i was not expecting such a performance increase.
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