770 is nice and bassy for sure!! I used to own the 555's, never modded though. Not sure how much bass you can ever get from them even with a Mod. Be curios to know though. Sometime this year I plan on getting the 990s. I was going to get them specifically for movies and gaming. I will put them on hold for now as I just picked up the Senn RS170 last week and am far happier than I thought I would be!! Gonna have fun with these for a while.
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