Hi Grimace, I just read your follow up post. Indeed it is easier to get good sound out of your computer than an ipod, that's what I do with the HRT Music Streamer II+ and my laptop. Does the 840C accept USB inputs? If not, you will need a USB To SPDIF Converter (assuming that your computer doesn't have a SPDIF output), such as Musical Fidelity's V-Link:
http://www.audioadvisor.com/prodinfo.asp?number=MFVLINK
http://www.audioadvisor.com/prodinfo.asp?number=MFVLINK