Hi, I have been listening to music via headphones for years, have a Rotel amp which gives me very nice sound, an ancient pair of KEF speakers, as well as an old Luxman turntable and a Cambridge CD player. I recently bought a pair of Shure SRH 840s, I like the sound of the 840s now that they have a couple of hundred hours listening on them (I really thought they sounded very thin out of the box). Question is this - I find I'm listening to music from my PC more and more, stuff I have ripped from CDs (I'm using WAV format) I either plug the headphones directly into the h/p socket on the crappy PC speakers, or I route the PC signal to my Rotel amp and plug the headphones into that. I am wondering how much of an improvment in sound quality I would get by adding a DAC/headphone amp, something cheap and cheerful like the Nuforce UDac 2: http://www.amazon.com/NuForce-uDAC-2-Black-Headphone-Amplifier/dp/B003Y5FRNS I also listen to the WAV files on my (new) PC via the Rotel amp & speakers (headphone output from PC connected to the amp via a Y cable), again, would I hear a huge improvement using a dedicated DAC ? Thanks in advance.