I got my A5 today and very unusually the first thing I did was play it at
as low a volume as possible. I'm not at my main system, so I have to use my phone through the headphone out into RCA.
At one step above silence on the volume control - so very quiet but audible - the A5 cuts out after 5 mins.
At two steps above silence - so still very quiet, and lower than I would deem 'very low background for guests' - it cuts in and stays on. So thankfully for me this should not be an issue ... though I will try again with my 90 db efficient speakers when I return to base!
I understand though where
@Piotr and others are coming from, possibly with desktop near-field background music use - or low ambient sound on film tracks or gaming scenarios again up close.
Mine came with OPA1656's as it seems did everyone buying A5, A7, A7 Mono.
Even with the basic RCA from my phone everything points to excellent sound when I get it back to my main set up. Even with this set up through old Wharfdale Diamonds the sound is excellent - full bodied, great bass control, clean highs ... the amp seems to take control nicely.
Post edit ... phone volume control with A5 volume control switched off.