Does jitter have any particular sound?
I've upgraded my Airport Express from 802.11b/G to 802.11n but unfortunately deep bass like contrabass and treble sounds like they oversteer.
When I connect my iPhone via mini-jack to my Hifi - Denon PMA920, Monitor Audio RS-1 and Van del Hul cables - the murmur is gone. It's not perfect but much better than wireless.
So, does wireless create more jitter and will a DAC fix this?