That ergonomics of the AK500N server looks really poorly thought out, it's such as mess. What I don't get is it wants to be a network music server, build in DAC/amplifier player, AND a personal headphone player? Huh? All the of the possible usage scenario clashes with each other.
As a headphone player, the tall design of this device looks like an ergonomic nightmare to use on a computer desk unlike the low sitting DMP-Z1. With the screen on top and inclining upwards the AK500N looks like it should be placed on a low side table next to a comfy sofa or la-z-boy incliner when used as a headphone player, but then I'll be wasting all the balance audio outputs at the back, because obviously the balance and RCA output is for this to be use in front of me connected to bookshelf or floor speakers as the DAC/amp combo source no? Okay so now in order to use it as a DAC/amp combo in an AV rack system setup and not caring about the headphone outputs, then why would I want it to sit on top of the shelf just so I can access the screen while taking up valuable space? Now that I have a turntable, top shelf space is always going to be reserved for my turntable! Also as a previous tube amp owner I can see tube amp owners needing that top shelf to give their tall tubes room to breath. So that cube design is a waste of space and rather it should blend into a normal component cabinet with the other AV components and go for a short but wide foot print. If I'm using it ONLY as a music server and even forgetting about the screen, I can for sure build something better myself as a music file server, or if I don't feel like it, just pay for a Roon Nucleus. And I can throw in a pair of KEF LS50W or LSX and I'll be up and running and kicking ass in sound in no time for a much simpler streaming capable speaker setup.
Even if given the niche scenario where I want to be enjoying ALL of these features in this device depending on my mood, I'll be moving it around a lot, but 12kg to move around? No thanks.
Also 12k US for this? All with off the shelf components and not a single custom audio parts? Come on....
The only thing I can see as being somewhat useful is the build in disk drive to rip CDs which would be a convenience for adding music directly onto the server.
This thing is like one of those comically oversized Swiss army knife that has everything on it but looks impossible to use well. Whereas the DMP-Z1 is a specialty knife that is limited in usage scenarios but excels at the job it is suppose to do.