swspiers, would you be kind enough to compare sound of 400i to your Grado 225?
Wow, I actually typed 1000 words on the comparison, but when I read it I found it to be the precise pontification and BS that I usually skip and ignore when I read it on this site.
So- in brief: Grado's are awesome. If you like Grado's. The 225i's have a narrow and intimate soundstage, recreate Tony Iommi's Gibson SG through Laney tube amps really well, and are incredibly revealing with gobs of micro-detail. But they have a bump at 100 Hz, and an abrupt roll-off below that. So- no bass in the lower octave and 1/2. Which helps to make them so clear and efficient. People either love them or hate them. I love them!
The 400i's, to me, are what a planar would sound like if Grado made them. These are great rock headphones, but unlike my 225i's, they bring the secret sauce to all genre's. But they are NOT bass-head cans by any means. They remind me of a perfectly integrated sealed Rythmik sub that one only notices when it's not on. Perfect balance, and when a song or soundtrack has meaningful content below 40 Hz, it is quite impressive. Otherwise, I can hear how some people think they are lean.
My Grado's used to get 75% of my listening time. For the past 2 months, they get maybe 10%. I like the 400i's that much...