I just got the LCD2C and am using them with a FiiO Q1. At 70 omhs and 101 dB / mW it should sustain 115 dB with 25.17 mw (1.33 V x 19 mA). The Q1 can supply over 75 mW at 150 ohms so it should be have plenty of headroom. Has anyone tried it with a much more powerful amp (say 500 mW at 70 ohms)? I can't imagine it will make a difference since I only listen at 63 dB SPL (calibrated to 75 dB SPL pink noise at -30 dbFS). I'm using them with the Audeze Reveal plugin and Loudness correction in Equalizer APO. The Reveal plugin makes them sound like my Shure SE846 and MultEQ XT32 calibrated speakers. I don't like the stock frequency response.