Hi,
I now have been using my E7+E9 combination for a whopping 2 hours (just arrived!) and I must say they sound great with my Sennheiser HD650's. (Disclaimer: This is the first audiophile setup that I've owned, so I don't have much to compare it with. It also means that I'm a n00b here. ;) )
However, the gain setting seems to be a problem with these cans. They are 300 ohms, so that's somewhere in between the small and large impedance. This gets reflected in the low/high gain setting. If I listen to the Jasmine album by Keith Jarrett and Charlie Haden (encoded into flac, from EMC records, recorded in a church IIRC) I must use low gain, because I hear static (and Keith Jarrett's "singing" gains a whole new level of that buzzing sound :-p ). I had to do the same for the 10 string lute transcriptions of Bach.
Listening to remastered Ytse Jam from Dream Theater (again encoded to flac) is a different story. I choose high gain because the lows and highs are more alive, with more sparkle, and if there was any static, it gets lost in the volume-level-that's-not-exactly-healthy-for-your-ears that I used. That 'sparkle' and 'aliveness' isn't exactly neutral to my ears, but it goes well with it. The low setting seems too... I don't know... through a veil, I guess, is how I can best describe it.
So, HD650's don't seem to fit well to either of the settings. It seems I have to change settings for different songs.
On the other hand, I've noticed that the crackle seems to gradually go away as you listen to more of the song. So, could it be a buffer issue? I'll keep listening and see... Maybe increase the buffer time of my VLC player, as I can't change the DAC's buffer...
Later,
Baris
Edited by pekirt - 6/2/11 at 2:08pm