My headphones died so decided on the Beyerdynamic DT770 and DT990 both in 250 ohm flavours. I know open Vs closed has many variables but was wondering what folks opinions are on these. I've actually bought both and have them on trial this week. Both sets are leaps and bounds better than my old ones - not sure what make, noise cancelling ones with like a G on the side. The 990s were first and put on a couple of tracks that I knew well and I could pick out parts to the songs I'd never noticed before. They sound much "wider" if that makes sense to closed back sets. I pretty much decided not to even get the 770s out. However, I did and it made the decision much harder. Much more bass being closed but didn't have that open sound from the 990s - I've assumed the drivers are the same just the construction of each set. These phones will really be 90% gaming and both sounded fantastic. I did notice, as you would expect, much more outside noise creeping in with the 990s. I'm going to test tomorrow night and put the TV on at a normal level and see how noticeable it is with both sets. Naturally the 990s will let in outside noise. Just whether it is noticeable enough to lean me towards the 770s. Having had closed for yeas, I think I maybe favour the 770s but the expansive nature of open, at the expense of a little bass has me thinking I'd been missing something from my listening experience not having tried open sets like the 990. What are folks opinion on open Vs closed and indeed the 770 Vs 990?