
I see. I guess isolation might depend too much on the awful vise grip. They don't respond well to amping? I suppose that might have something to do with their low impedance. These cans were designed to work well with iPods, so engineers may not have had amps in mind. I suppose the HD 280 Pro's might be better, then. But their uncomfortable vise grip is legendary.
Impedance has nothing to do with them not responding good to amping..
If you check my other cans you will see that they are low impedance cans but they shine through amping..
They only good thing with 448 are vocals..
They leak at volumes above normal,they do not have sufficient clamping force and so on..
I quite believe these are cans for children who buy their first toy.
But none of you or the OP stated what kind of music do you listen to..



















