I can say that nate jeans cables are awesome, but they dont' have any flashy stuff on them, and the shipping charges are outrageous. $-60 for a freaking headphone extension, wtf.
Yup. Basically, you can't hear jazz listening to the radio, on an elevator, or in a coffee shop. Very little of what gets sold as jazz is interesting. But good jazz is so far from boring that you can't really even get there from here. As I mentioned in another thread, some of the experimental jazz has more in common with punk rock than it ever would with kenny g.
I've never seen 340s, let alone heard them. But most people who complain about bass levels on headphones have never experienced a rock and roll show, imho. With some music, it's impossible to have too much bass on headphones. Physically impossible. PS1s approach realistic, minus the tachycardia.