Sounds like you're describing SuperFis.

Grados and Etys are like at completely different ends of the spectrum though, I tend to find Grados more coloured which gives it its fantastic adaptability to rock/live music while ER-4s are as transparent as transparent gets... ie. flat.

I wish I still had my ER-4Ps though, they were my main portable IEMs for a good 2 years before they got stolen along with my iPod.

Nah ER-4s sound nothing like Senns... in fact I find them quite the opposite. I probably wouldn't buy ER-4s again, they're nice but a bit too neutral for outdoor use. They're exactly what they are.. monitors. Lots of detail but absolutely no colouration.

RS-1s are very very very nice for live music... its hard not to start tapping your feet when you listen to one.