Thank you, so I've not to expect a big change in sound. And the fact that with my portable the sound is not bad with the adapter (many say that an amp is needed with ER-4Ss, while the ER-4Ps sound great even without it) means that my portable is able to drive the ER-4S (or that my ears cannot...

I got a pair of ER-4P. They sound great. I made the adapter using two jacks and two 75 ohm resistors between. I still have no headphone amps, but I can hardly listen any difference with and without the adapter. I'm listening from a portable CD playre (Sony D-E221) and I've to increase the...

I travel by train, 50 min. 2 times a day. Trains are quiet noisy, in particular in the summer with windows open. I listen to different kind of music (classical, jazz, rock) with a portable CD player and, especially for classical or soft music, I can hardly hear the music. I was thinking about...