I have a number of extremely high quality tube and solid state amps for speakers. I am wondering about using them with Sennheiser HD800 headphones, which I do not have yet (backordered). I know that my hundred watt transformer coupled tube amps will lost a lot of power at that impedance, and it's not an efficient use of gear and electricity, but are the results typically good when doing this? I also have 140 watt OTL (Atma-Sphere) amps I could try. Anything to watch out for when doing this? Have folks had good results? Thanks in advance.