I think you'd see more by looking at frequency response and THD+N. CSD and low frequencies is not the best combination.
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Agree with xnor, low frequency resolution of CSD is poor, yet you'd need it to be fairly good for headphones because of the smaller dimensions involved.
Still need at very least a FR plot before, and after, and THD would be helpful too. Reading through the mods, nothing jumps out as a key factor.
A few things do seem clear, though. First, the judgements of the performance before and after are an opinion, no measurements taken, and no control group. The opinions were formed using sighted A/B testing, not double blind testing, so expectation bias has not been eliminated. There is also a claim for the need for 300 hrs of burn in. Those that have attempted to verify the effects of burn-in have not been able to show repeatability, nor significant change. Not to say that some specific headphones wouldn't change, but again, with out double-bind testing or measurements, or both, we don't have much to go on. Finally,perhaps to reiterate, and this isn't meant to discredit anyone, or anyones observations, expectation bias is a very significant factor that must be eliminated if subjective observations are to have real meaning.
From were we sit, which pretty far removed from the actual modded headphones, it's very hard to be analytical, and that's why we can only theorize. Personally, and this is only an opinion, I listened to the entire line of Denon headphones, and thought all of them were unacceptable, not just falling short of great, genuinely unlistenable. My issues with them were not with bass alone. I have no doubt others will feel otherwise. But again, only one subjective opinion, no double-blind testing.
The point is, I'm not sure how much or input we could offer without having more data or listening to the results.
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I don't quite believe in burn in either, although pads do get softened (thus seal better) with more wearing--which may explain some perceived sonic changes.
Edited by zzffnn - 5/11/13 at 7:29pm
People suggesting burn-in are not suggesting it be done while wearing, though. Just lying the headphones on the table and having a burn-in signal played into them at fairly high volume. So, pad wear wouldn't be increased that way.
I personally wouldn't design something that changed noticeably well within the first couple of years of ownership.