I'm a newbie to all of this, and I'm still trying to figure out my needs and what options I have. The minidsp flex is intriguing. I can't quite tell - is the minidsp flex a DSP and Dac or a DSP, DAC, and AMP? If the latter, the price is reasonable and apparently it's review is quite good.
I'm also now investigating Roon.
I originally wanted a DAC/AMP for my home desk - Macbook - headphones (Sundara) + powered speakers (AudioEngine A2). But I also wanted a system for work (Windows) - perhaps Sundara (but they are a bit fragile transporting back and forth from home to work, so trying out AKG 371 and Senn HD 560S) with a Hidezs S9 Pro AMP/DAC dongle. I also have an iPhone and iPad. I currently subscribe to Apple Music. At home I also have AudioEngine A5 speakers connected through an AudioEngine bluetooth interface to Alexa to place Apple Music - it's not the best connection in that I often have to engage and disengage Alexa to use and not use the A5 living room speakers.
I'm considering moving my A2s to the bedroom to connect to a TV for better sound (currently use sound from the TV) and buy some PreSonus Eris 3.5 monitors for my home desk (a bit big for my small desk) - useful to use balanced cables for desk electrical interference issues (A2s only have RCAs). And maybe I could use the minidsp flex for other speakers around the house (A2s with the tv, A5's in the living room, etc.) - but Roon might be better suited to that job.
I'm also trying find the best solution for work. iTunes is abysmal on the PC, so for a while I used my iPad at work to play Apple Music - without EQ. Today I started a trial of Tidal and used EQ software for Windows 10 to get good sound with the S9 Pro. But, my family uses Apple Music, so Tidal isn't the best option for me. In addition, my work may stop employee access to Tidal soon (can't get Spotify, Qubuz among others), so Tidal access at work may be short-lived. Thus, I may need to use Apple Music through my phone or iPad (or a music player?) at work - this could be blocked at work too, though I can use cellular data on my iPhone. I suppose the minidsp flex isn't very portable, is it? Currently, with the iPhone or iPad I can't seem to find a way to add EQ to Apple Music.
Anyway, my primary objective is to have headphone access with EQ both at work and at home, and mostly likely through Apple Music.
After saying all of this, perhaps a music player is my best option (at work). It's just that streaming is so convenient. Though, if it's Apple Music I'd have to convert it to PC formatting (if that's legally possible).
Anyway, I'm all over the map - learning and trying to figure out my best option(s). Suggestions are always welcome.
Michael