Outlaw 2160 and Sennheiser 650s?

Hi everyone, first post. I just got my 2160 and am so far, loving it. One thing though, has anyone tried to drive some high impedance headphones through the receiver? My Sennheiser 650s sound a bit low. I know they are notoriously power hungry but I thought the 2160 would drive them fine. Has anyone else tried the 650s with the 2160? Does anyone recommend a separate headphone amp to connect to the 2160?

Thanks!!

Try the Schiit brand of headphone amps. Good build quality and will drive your stuff.

Check out this link for a bunch of headphones amps for any budget

https://www.needledoctor.com/headphone-gear/headphone-electronics/headphone-amps