[terrapin13]

I have a pair of Sennheiser HD 650 which I love.  However, at work I need a close back headphone due to proximity of co-workers.   Currently I have a pair of NAD HP50 which I use with my Schiit Valhalla tube amp with Uber Analog upgrade.  I like the NAD headphones but the headband gets very uncomfortable during the day.  I usually have to angle it forward to relive the pressure.
 
I would like to find another over the ear close back headphones what will pair well with the Valhalla.  Upper end of the price range is about $600-$700.  
 
I have been looking into the BeoPlay H6, Alpha Dog, Mad Dog Pro headphones.  I would greatly appreciate any recommendations!

 

[gibtg]

I'd like to know the same thing, what sealed headphones are a good pairing for a tube amp. Please someone with knowledge of the subject chime in!

 

[Me x3]

You could read about the 300 Ohm German Maestro GMP-450 Pro
(or CharterOak SP1, same headphone)