I just realized today I had the K601 foam inside my Q701. Not a huge change, but when I put back in the correct foam (was only in there a month) the treble was a bit easier on the ears.
Basically about 95% the same. I noticed when I used an assault rifle in Fallout 3 with the K601 foam it's a bit ear piercing. With the Q701 foam..not so much. The K601 foam felt as if the sound was slightly clearer, but maybe not.
The Q701 foam behind the pads is sort of sparkly and scratchy. The K601/K701 foam is smoother, soft and has smaller holes in it. You'd think the Q701 foam would actually make them have MORE treble due to being more open..or so it seems.
I also tried some K501 pads on my Q701. Surprised that the bass didn't really decrease that much. The sound was very well balanced and I didn't have any foam installed.
I don't know why, but this time around the K601 pads on my Q701 were not at all fatiguing. I'd say the mids are a tiny bit more forward and the soundstage is maybe a tad smaller perhaps.
Believe it or not, I actually think there is LESS treble with the K601 pads and this makes sense. I will leave them on for a week and see how well I like it. They're softer and a little more comfortable, but not angled.
Everything sounds a little more up-front and like my HD-580 somewhat. Not as full sounding obviously. I imagine K601 pads are too expensive to be worth getting as a possible comfort upgrade.
It does seem to improve imaging when using the K601 pads. Not sure how this is possible.
If you have the Q701 you should check to see what foam you have if you're curious:
The Q701 foam is on the left. You'll see that it has some sparkly areas on it and is scratchy. Obviously don't do this if you don't know how to install the pads. They twist on and off using the tabs. The thicker side is facing towards you.
BTW even with the K601 foam, my Q701 is still much easier on the ears than my old K701.
Could be they're really all the same and randomly look different, but they DO have different part numbers.
Tonight I also tried the K601 with Q701 pads..makes it very fatiguing. I guess more air between your ears and the driver and the more treble you get. That's how it is on my DJ100, but that's a closed headphone.
That's another reason the K601 might have given me the impression of less treble on the Q701 with K601 pads. Maybe not.
UPDATE: K601 pads for gaming is ok, but for music the K601 pads on the Q701 make the mids much too fatiguing.
Edited by tdockweiler - 7/15/12 at 8:18am