Originally Posted by LCfiner
hmm, I wonder if Tyll meant to say that. I wonder if he meant to say that it has better bass than the HD600 (which I would agree with) but not the HD800 (I'm with you on that one, no doubt)
As for the HD 25, those are just too V shaped in FR for my taste. The momentum have much better bass extension, less grain to the sound overall, and don't have the peaky treble of the HD 25. I wouldn't call the Momentum dull or fuzzy - even on my M-stage. I'd characterize them as a cleaner sounding HD650. better bass extension, similar FR, but smaller soundstage.
Based on Tyll's 30Hz SW data, the Momentums do indeed have much better extension than HD800.
And the important thing is that the Momentum 30Hz SW isn't wonky, it's almost 100% clean. Maybe not as clean as planars square waves but enough that objectively they measure fairly well-behaved and extended bass.
Also in terms of THD in the bass region, it seems one driver of Momentum is comparable to the THD cleanness of HD800 drivers in the lower bass region, the other driver however seems to be wonky, maybe a bad driver match.
Altogether yeah, measurement-wise Momentums do trump HD800 bass for the most part, except bass clarity. Of course it can be a different story with subjective listening, since things like texture can't be measured with much assurance.
Of course, if that argument is held, then pretty much all planars (all Hifiman and Audeze, including HE400) can be said to absolutely obliterate HD800 in bass performance. All near-perfect 30Hz SWs, and extraordinarily low bass THD.