T1's have too much bass? Bollocks! I find the T1 to be more neutral across the band than the K702 is. The K702 is horribly colored to sound "neutral". That's why I always say it sounds forced. They are nice headphones, I enjoyed them, but they are not accurate. The bass is less than neutral, the mids are a tad shallow, and the treble is overly pronounced. They need a lot of fixed to be called neutral. The mids themselves have a strange coloration that makes them sound fake. About the bass, it rolls off early, and that isn't realistic at all.
Acix, I can't believe you think the T1 has more treble then the K702. The K702 is far more peaky and strident in the treble than the T1 is. In fatc the K702 treble is boosted beyond neutral and the boost is not needed.
Only a K701 fan would say that the T1's have too much bass. You might want to tell those who accuse them of having too little. IMO the K701's lack of any real bass is one of their major flaws. As pointed out by moniker "A" below, the bass/sub bass performance of the K701s does leave one wanting for more true to life bass.
As well, the 10kHz spike is quite a bit tighter and occurs at a range in the frequency spectrum where not much is going on, so its not anywhere as big an issue as the K701 treble spike that kicks in at around 6kHz and lasts until about 10kHz. I find this much more of a colouration and obtrusive to what's really going on in the recording.
And the tin like treble on the DT880/600s is what killed them for me. The K701s are just a too lacking for me in many areas to consider as even a viable mid-fi solution IME. Funny how we all have different opinions of "neutral".
There's only like a 1 dB difference between the DT880s and T1s with regards to bass impact (hard to tell...I know, it was tough when I had them both for a few months). But the K701s are more like 5dB.