The sound with and without NC was slightly different, but I can’t say the NC circuit does its job in totality. Though Koss states that the unit works only to reduce low frequencies, this too was not too satisfactory. None of the NC headphones I have checked can really do much, so I guess the technology needs to improve.
The sound without NC was expectedly better, especially the nice rolled-off highs and flat mids. Bass was a bit muddy-sounding; I envision a slightly more than needed bump on the low end of the frequency response. Volume and distortion are fine; though a decent amount of power is needed for ‘loudness’, my levels were at their highest when I felt the sound was loud enough.
Conclusion
Now here's the reason why I’ve been so finicky with the review. The cost is Rs 6150, and that’s pricy. There are good points, like the nice highs and mids, and the good comfort factor. But bass is not the best, and noise cancellation, alas, is only ordinary.
there are lot of old cans in the indian white market, suggest a good pair of cans that fall in the 2k-2.5k range and have inbuilt preamps for computer wear and dont have miles of wiring 
