I have the K701 and find them to be excellent if you like a lean and natural type of sound.
The K701 has a bass roll off just like every headphone does. The midbass is not overblown like some, so its generally percieved as being a bit bass shy. I'd never increase the midbass, but the LF extension can use a little propping up. It also has an exaggeration in the 6K-10K range. I tame it a bit. Of course the FR graphs are to be taken with a grain of salt. But they're useful for getting a geneal idea of what needs to be addressed.
I'm using WinAmp right now because of one great EQ plugin, Shibatch SuperEQ. This plugin has a parametric EQ feature that lets me adjust exactly what I want to. I've flattened out the bass using 1/6 octave bands and tamed the treble hump down by 3dB. My parameters look like this:
22.4-20.0Hz +4.0dB
25.2-22.4Hz +3.5dB
28.3-25.2Hz +3.0dB
31.7-28.3Hz +2.5dB
35.6-31.7Hz +2.0dB
39.9-35.6Hz +1.5dB
63.2-39.9Hz +1.0dB
79.6-63.2Hz +0.5dB
100.2-79.6Hz +1.0dB
112.5-100.2Hz +0.5dB
10000-6000Hz -3.0dB
The predicted FR is this:
I can't measure it, but it
sounds like that. I'm not hearing any junk. I usually find that all DSP enhancements mess things up. But this just gives the K701 bass the authority I was looking for. No bloat or over exaggeration. And the slight taming of the treble hump is welcome, and takes the slight edge off of the forwardness sometimes heard.
P.S. Shibatch SuperEQ does use a cache, so whenever you stop and change tracks you'll hear a fraction of a second of the last track you were listening to. A very minor annoyance, and well worth it. If you know of a great parametric digital EQ that has
zero drawbacks, please tell me.
I credit my headphone rig for teaching me to be a discerning listener. It takes a of a loudspeaker system to get the better a good headphone rig (in some departments, not all. But my HT is winning now, yay!)