Just picked up this thread.
A Standac (or similar external DAC) lifts a Squeezebox into and entirely different league.
The Squeezebox's internal DAC is not very good.
If someone cannot hear the difference the following analogue chain is highly suspect, or the link between the two boxes is faulty,or the hearer needs to find an audiologist and have his ears checked!
Brian
In Southampton: Raspberry Pi 4 running PiCorePlayer, Beresford Caiman SEG, Quad 77 Int Amp and CD Player, AVI Neutron 4, Sennheiser HD25 headphones.
In Nicosia: Small Format HTPC, Beresford 7520 ,Quad 405-2, Quart 980s German Tower Loudspeakers.