i have both wired and wireless hookups in my house. i have cat5e wire and use 802.11g wireless. the only issue i have had with the wireless connection is competing with another wireless device. i had to change the channel setting on my WAP and it has been fine ever since.
i would recommend hooking up your computer or external device (airport express for example) to a jitter reduction unit, then from there going into an external dac. there was a HUGE difference in the quality of the sound when adding these devices before the dac. i use a quality coax cable from the jitter device into the dac. all of my remote connections in my house have this type of setup with very good results.
i also believe after reading articles and reviews of usb connections with usb dacs that that is not the way to go. the other reason is you are limited on which dac you can by if you stick with usb. the best external dacs do not use usb and the reviews of the dacs with usb have not been favorable.
i would recommend hooking up your computer or external device (airport express for example) to a jitter reduction unit, then from there going into an external dac. there was a HUGE difference in the quality of the sound when adding these devices before the dac. i use a quality coax cable from the jitter device into the dac. all of my remote connections in my house have this type of setup with very good results.
i also believe after reading articles and reviews of usb connections with usb dacs that that is not the way to go. the other reason is you are limited on which dac you can by if you stick with usb. the best external dacs do not use usb and the reviews of the dacs with usb have not been favorable.