sorry i fixed it. I was talking about the protector in single ended mode

It seems as if the majority of the bass body is completely absent. Its very obvious     I will continue to burn in the cable to see if any difference comes.     Using both my ipod classic and my iphone 4 i get the same result.   im using the single ended option on the protector...

I just received a RSA protector from a user on the forum, and I have to say it improved almost every aspect of my JH-13s    However, compared to the headphone out of the iphone 4, the bass is heavily lacking.    I have a brand new ALO SXC 18ga dock that has not been burned in.     ...

Same here. I have a protector and a balanced TWag v2 cable on the way

Is there dramatic sonic difference to justify the price difference?

apart from upper tier headphones / customs, I dont see any use in owning anything else

Does anyone use their JH-13s for the gym?