" ..., I find that I can tweak most equipment by opening the case and adding earthed shielding around power supplies (critical) and other boards. Shielded dummy plugs can also be worth considering as they can stop external interference having a direct path to boards (sometimes only minor), but still worth considering if you are hoping to extract the best from your equipment."
And I'd bet that replacing the '2-cent' SATA cables used from SSD/HDD (seen on too many "premium" Streamers/Servers/Transports) with a premium cable would iresult in significant SQ gains.
Knowing (full well) the impact cable has on performance, it strikes me unusual (ly) cheap that so many companies (Aurender, Melco) choose to use the cheapest cables extant ! (?). The price of these things (glorified computers/NAS's) demands the finest parts/cabling available and yet is not offered. Laughable. And unfortunate. To those that have invested so heavily in the big talk/name only to discover the cheapest generic cabling lurking inside its fancy chassis.
pj