Hi,
thanks for fast response.
i'm not able to answer to all your questions but will shortly tell u about situation.
my BBB is connected to router via wire, BBB is connected to QNAP via USB cable, QNAP is connected to DAC via USB cable.
i tried to set up using this instruction => Computer Audiophile - Geek Speak: How To Build A BeagleBone Black MPD Music Server
but it didn't work properly because i couldn't find this file on the web => BBB-eMMC-flasher-debian-7.1-2013-07-22.img
i tried with newer but it didn't work properly - iphone app couldn't find any server
after this i tried with volumio. iphone app found server but it couldn't connect with qnap.
i know that connection between qnap and dac works properly because its possible to play music from qnap (using webbrowser on pc to connect with qnap and play music).
i believe that this info may not be enough but maybe u know other instruction that will solve my problem.