Just bought the sennheiser hd 820 , And the default sound from my PC and mobile is bottlenecking them, So I am looking for suggestions of good headphones output, I have my eyes on these because this one seem to be the latest of 2019 and I want an expert opinion if these are worthy enough to buy, The sony one is very expensive tho, Is it worth the price? Which headphone amplifier should I get? Thanks in advance.