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Originally Posted by Daverose
I get the same sense that AKGs can be percieved as being too colored un the upper midrange as well. And I think this area is really critical about our perceptions of sound. Looking at the FRGs of the k701 and HD650, the k701 actually has more lower bass then the HD650. Yet everyone percieves it as having less bass then the HD650. One of the reasons the HD650 might be percieved as bassier is it's softer mids. And I think tonality utterly depends on your frame of reference.
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If it's this graph that you're talking about, then we may have hit an obstacle. Word has it that these graphs are not completely accurate. I've owned the K701 and still have a pair of HD650. From what I hear, the K701 definitely doesn't have a more pronounced lower midrange and bass. Doubts about the HR FR graphs were raised when Don Wilson of Etymotic stated that there was something wrong with the Etymotic FR graphs. However, this is slightly off topic and another different story altogether so I'll refrain from continuing any further

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Originally Posted by Daverose
But when I listened to an orchestra, it seemed like woodwinds and percussion really didn't have much weight. I think this is where the HD580 series shines. Sennheiser took auditorium accoustics into account (which has a recession in the 8khz range), so the HD650 seems to have the proper tonality for a full sized orchestra.
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Actually, percussion and woodwinds really isn't that thin-sounding. Maybe compared to the Senn-house sound, electrostatics are more anaemic, but in general I find the "weight" to be adequate. I think you ought to listen to the legendary LSO/Antal Dorati recording of Stravinsky's Firebird (on Mercury Living Presence) or the Telarc Tchaikovsky 1812 DSD recording. There's definitely enough weight and energy behind each crescendo, forzando, accent, etc... The orchestration is so darn complex and the dynamic range so wide that both pieces prove to be incredibly difficult for headphones to reproduce. That said, the electrostats tackle the complex passages with absolute ease: every drum roll faithfully reproduced, every phrase perfectly articulated, leaving no stone (read nuance) unturned. However, there is a definite lack of oomf behind loud timpani "strikes" accompanied by full orchestral backing and the infamous speaker-blowing cannon bits. In the latter passages, my poor Stax seems like it's retreating

There's so much
power missing! The dynamic range is simply too much and the SR-404 shrinks back into its shell LOL! This is probably where dynamic headphones take over!