Your opinion is correct at the level of 'it is a computer fabricated on a single board'.
However no need for a BOM.
Just view the images on this wiki page, and you can see that Poly uses a circuit board custom designed by www.disignconsultants.com , who were also responsible for the software. I remember in the early days of the Poly thread, there was mention that they had specific design skills in RFI suppression/elimination. Owners posting about Poly enabling a 'dark background' to quiet music passages, provides evidence that the circuit board performs very well in terms RFI/electrical noise.
In conclusion, yes you can describe the Poly as a SBC, but it won't be a $5 SBC like the ones sold daily in their tens of thousands on Amazon.
Thanks for the links. I'll take a look in more detail when I have time. I must have mistaken the Poly and the 2Go share the same board. It's been a long time, but I remember someone posting details of the 2Go board which led me to the $5 SBC conclusion since I'm famliar with the 2Go SBC brand.
I admire your Chord can do no wrong passion. I'm a SQ geek first so if something doesn't suit me I just move on to something that does. I would not mind Poly for convenience, but when it comes to SQ first I need to find my own path.
My portable Music Server should compete with $3K desktop music servers and once I implement state of the art military-use clocks it should compete in the $5k-$10k. If I just needed something for convenience, Poly should be fine if it's working solidly.
I just love where we are at with the options available at this time to pair a nice battery-powered Music Server with a portable/transportable Chord DAC.
I just want to make aware there's more out there if you keep an open mind than being locked up in an iOS/Android/Chi-Fi ecosystem where SQ is constrained and possibly resampled.
For some, buying a Chi-Fi 90 degree cable, Chi-Fi DAP, Poly or installing an app is a exciting solution and that's fine. Since I'm a geek first, that just doesn't do it for me.
I'm out until something more official.
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