CHANGSTAR: Audiophile Headphone Reviews and Early 90s Style BBS
Lobby => Headphone Measurements => Topic started by: ultrabike on October 11, 2014, 04:54:16 AM
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Some impressions here:
http://www.changstar.com/index.php/topic,1819.0.html (http://www.changstar.com/index.php/topic,1819.0.html)
Some measurements:
Frequency Response
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7787;image)
Distortion Right
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7789;image)
Distortion Left
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7791;image)
CSD Right
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7793;image)
CSD Left
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7795;image)
vs HD600 (Stax in red, Senns in yellow)
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7797;image)
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Throwing SR-307 (red) vs SR-009 (yellow) fr comparo...
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7799;image)
... and adding HD600 (green) to the fr overlay...
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7801;image)
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Yeah, I was getting a rather painful shoutiness with female vocals (Stevie Nicks). I presume it's from the 8k peak preceded by the massive recessed trough.
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That's my best guess as well. It can sound a bit bright with some material.
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That dip looks crazy
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LOL! could be a measurement artifact to some extent, but recession does seem to exist in the upper mids relative to other cans, also going by what we are hearing.
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The 600's look pretty smooth in comparison to the other two.
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It's all relative... but yeah. Trade offs...
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Something to point out about these cans... or maybe the SRM-323S amp.
At 100 dB the SRM-323S + SR-307 combo seem to struggle in the treble area. Distortion increases to about 1% for the right channel and about .6% in the highs, but it's all kinds of high order harmonics:
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7803;image)
Note also the distortion measurements don't go too high in frequency, but they seem to be increasing for the Stax combo as frequency increases...
HD600 struggles in the bass area at high SPL (100 dB), but the highs seem relatively clean of high order harmonics:
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7805;image)
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It's the amp, they did the same treble nastiness to my ESP950s as I increased SPL. I think it would be wise if Stax could replace this loaner 323S with a proper functioning one.
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Ok, tried again, but this time I used a rubber band to make sure seal was achieved... and perhaps driver and mic got a little closer, but anyhow this are the results:
Frequency Response
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7808;image)
Distortion Right
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7810;image)
Distortion Left
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7812;image)
CSD Right
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7814;image)
CSD Left
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7816;image)
As far as which measurements are more "right" (vs this ones (http://www.changstar.com/index.php/topic,1820.msg49246.html#msg49246)), depends I guess on how good of a seal one actually gets. This is not necessarily easy with this cans. That said, I believe these represent as good as one is going to get under ideal conditions (specially the left driver measurement). The deep & narrow null at around 4.5 kHz might be a measurement artifact though.
Also, as far as the issue with 100 dB, I believe it's due to the amp being pushed too hard. Previously I feed a signal at -20 dBFS and achieved 100 dBSPL by pushing the SRM-323S volume knob almost to the max (issue was repeated today). However, if I feed a -10 dBFS signal instead, I get much better results (high order harmonics in the treble region):
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7818;image)
Comparo again with SR009 and HD600s:
(http://www.changstar.com/index.php?action=dlattach;topic=1820.0;attach=7820;image)
As said before, I feel the SR307 have this upper mids and treble shoutiness to them relative to the HD600s. Best guess is that this is due to the depression in the upper mids relative to the treble.
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So the amp is just bad. I've never heard any 323 do this and I've heard about 4 of them at least not counting this one. I always listen relatively loud too, so gain shouldn't be a variable with my impressions.
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That maybe indeed. Things are not too bad if volume knob is set to about 12 or so o'clock.