I have to give Doc Holliday (the head-fi'er, not the outlaw....and not Val Kilmer) the credit for some of this. I am 40 years old but honestly had no damn idea what dubstep was until a few months ago. Doc's point was that, while the 1350s had amazing bass in terms of extension, for something like dubstep there is more that can be had in terms of the AMPLITUDE. Now that is usually a deal breaker for me because I can't stand bloated, boomy bass. That's why I will swear up and down that the 1350s are truly amazing in the low end, because they hit all the way down BELOW 10hz and they keep it clean the entire way. It's also why I have the opinion I do about this 1350/ZO combo, because while EQ'ing can give you greater amplitude, in my experience it doesn't maintain the integrity of the bass. It gives you more "nose", not more bass. Whatever the guys at digizoid have done, their product allows you to have greater amplitude while also keeping MOST of the quality. So when you have headphones that already hit really low, and you give them a tool like the ZO to keep it clean AND increase the amplitude, it's pretty damn exciting, IMO.
I really didn't like the Grados with the ZO, but that's not the ZOs fault. The Grados just aren't really designed for that type of application. The 1350s literally beg you for more, though....they'll take whatever the ZO can give them and keep asking for more. I think it was in Tyll's review where he said the bass on the 1350s was bottomless. Well, when you fire up the ZO and add it to the equation, you can also say there is no ceiling, either. All of a sudden you have a pair of $260 portable headphones that give you pretty much anything you could ever ask for on the low end, you know?
This is exactly what I needed to know. Thank yo