This. I and I imagine many others here have heard a few HE6 series headphones from the LP and found the sound to be very limp and definitely lacking in power so just based on this alone, it'd be hard to make recommendations for you. Even with the LC which is sufficient with (IIRC) 5W at 50ohm and actually sounds good with my modded HE6se, the sound still isn't at the "next level" a power amp would put it at. If you get a power amp, make sure you use a pre or something else to not blow your headphones up. If this statement surprises you or makes no sense, then for your own safety, skip the power amp > HE6 setup.