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I'm looking for a headphone that's basically the opposite of what the O2 is (sealed, best suited with high-energy, more bass intensive music), but still has the overall balance and lack of coloration that I love so much about the O2. So far I've come up short, but I think the Thunderpants or LA7000 may be prime candidates. Or potentially this Fostex depending on what the folks here have to say.
I've recently gone from an O2 MkI (& SR-4070) + SRM-717 setup to Thunderpants. I find the TP1 strangely similar to the O2 actually, excepting that it's closed with much more slam. It has a similar frequency response, and even the slight rounded etching of the treble, but it can't match the open, relaxed sense of being there of the O2. Pads are very important: I found the stock pads to give a boomy bass and cavernous sound, while changing to the LCD-2 (vegan) pads makes them much leaner with plenty of detail revealed while still retaining the bass extension and slam, and increasing the soundstage to boot. The O2 pads are actually a good, and very comfortable, option also. The Beyer gel pads are comfortable too (if a bit sticky) but still too much/boomy bass for me. Whichever pad you choose, a good seal is important for bass. With any of the above, isolation will be supreme.
There must be something I'm not satisfied with about them though, as I'm watching this Fostex business like a hawk
(especially now the price is dropping!) Not quite enough detail? Not enough realistic sense of "being there"? Not sure... maybe it's just temptation
Since you already have a great 'stat amp though, have you considered the 4070? Isolation is fairly good, bass is tight and lean, and it's a stat for (Audio-)gd's sake! It's VERY system dependent - I haven't heard it on the KGSS, but I found it to basically serve up your upstream components (including cables) to you on a silver platter, which I guess means it's uncolored in itself. Light, airy stat sound, amazing level of speed and detail, helped by the isolation, but again not quite as natural as the O2...