I actually found the HE500 quite ok directly out of the of the SB Touch when I tried it. I actually migh try lcd3 later for you, if I find the right adapter. As a stadalone source the SB Touch is above wfm, but you should seriously get a headamp, a 99usd Schiit Magni or something. The SB Touch headphone output is a bit noisy with sensitive phones, BTW. But it is a great source, both digital and analog. What a waste Logitech disconitnued it.