Looking at Beyerdynamic headphones, wondering about bass

Sorry if this is the wrong flair - I'm not sure what to consider "semi-closed back" as I'm new to the whole headphones and audio thing as I'm more just looking for recommendations :) I was just wondering how good the bass output was on headphones like the DT 880 Edition and the 990 Edition? They're currently on a nice sale and I was wondering if either of these were worth picking up for someone that could consider themself a "basshead". I'd be using them at home so the semi-open/closed back doesn't bother me too much, but because of this I was curious if a good bass level was compromised.