I have the L30 and E30 combo and due to the lackluster output from the amp... I'd suggest using a higher output voltage dac to pair with L30. I have tested other gears with L30 such as mojo (output max 3.0V), Fiio K5 Pro and of course E30 (the first 2 mentioned are actually dac/amp) but the mojo sounds the best. With the other dacs that have the normal output voltage of around 2V, the output of the L30 seems bleh to me. In my practical operation of the amp, I prefer not to crank the volume above 3 o'clock for "normal" listening but I find I have to do that with other dacs except the Chord Mojo so I have come to this conclusion that L30 lacks power. When I say lacks power I mean it when I'm playing my quietest track, the sacd beethoven 5/7 by Carlos Kleiber, I'd have to go past this 3 o'clock dial though for pop songs, 12 o'clock was sufficient. All testing/listening using medium gain of L30 as I don't usually use high gain or prefer not to use high gain. Headphones used are sennheisers 6 series and Sundara.