Quote - "Does anyone have a frequency chart for the Sz2000?"
Quote - "I want to compare them to the M100 I doubt there exists one yet, I'm also very interested in seeing it as it tells me quite a lot already knowing what kinds of curves appeal to me."
The graph from from the JVC website - http://www3.jvckenwood.com/accessory/sz/img/more/db_stream_diag_02.jpg - the only one I could find. [the website - http://www3.jvckenwood.com/accessory/sz/learn_more.html ]
See the resulting frequency response composite (of the two drivers) line in yellow colour. Elevated sub-bass to upper-bass SPL (sound pressure level / volume). Very neat and linear. About plus 10dB (deciBel) boost relative to the middle vocal range, just about the right number / volume for this kind of headphones. (For a reference or neutral headphones the proper compensatory bass boost would be about 6dB).
SPL starts dipping at around 750 Herz. The upper vocal range of 750Hz to 1100Hz dips/recedes; at 1000Hz it is minus 15dB relative to the middle vocal range. The dip is of about 20dB volume from 1100Hz to about 5500Hz and there is further one of another 5dB fall resulting in the total 25dB depression at 7500Hz. The high frequencies climb almost back to normal at 11000Hz. (..a bit too late). These recessed 'highs' would seem to be the Achilles' heel of Sz2000. I have not heard these headphones but I would say that the lack of proper strength / volume of upper mid to high frequencies leads to less resolution and a bit murky, not 'reference clear' and not properly delineated sound of instruments and vocals in the most critical lower section of the middle frequencies. The higher frequencies harmonic overtones of tones and the high frequencies themselves play the role of sculpting and delineating sound of the musical instruments and of creating 'air', as the word goes, around them. But there is a golden nugget in the mud for some, these headphones will not hurt ears of those whose hearing is sensitive to the high frequencies peaks. ( Although we still need to see the CSD plots, when available, if there is any screechy resonance / 'ringing' at 10000-11000Hz - the link on 'CSD plots' : http://www.head-fi.org/t/566929/headphone-csd-waterfall-plots )
HA-Sz1000 / HA-Sz2000 were clearly designed for a certain market and their main target are the Beats' billions in sales. The devotees of the heavy beat and bass sound of certain forms of 'music' like electro / house / techno / bass and drum / dub step will find Sz1000 / Sz2000 'right up their alley' (proper fit to their taste). They are, looking at the FR graph, not really a good match for the sounds of the acoustic music and not good especially for the women's vocals.
My view on the design of these headphones is that the 30mm driver is not fully capable of properly reproducing the mids and highs, not to the sound standard of the other 55mm driver. It should have been of the 40mm size at least.
Edit - The FR graph link does not seem to work at times. If it happens then just click on the JVC website link above, then google translate the page and then scroll down to the headline 'Treble Unit In Which I Made A Special Tuning For Stream Woofer DB'. The graph is just below the headline.
Edited by zorin - 8/6/13 at 6:28am