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Well put. Hopefully, the pre-orders get fulfilled ASAP, and we can start sharing listening impressions from extended sessions in known listening environments.
We received a pre-production demo of the HEDD HEDDphone at Head-Fi HQ and did some preliminary measurements. I'm calling these "preliminary" because these measurements are averaged from only two different seatings (we'll do more later). I should note that the despite the two seatings being done by two different people (me and @AxelCloris) -- and the fact that two different headband size settings were used -- the measurements were virtually identical.
Figure 1 (above). HEDD Audio HEDDphone (pre-production, production voiced) frequency response.
Here's the HEDD Audio HEDDphone versus the Harman AE (Around Ear) / OE (On Ear) Target:
Figure 2 (above). HEDD Audio HEDDphone (pre-production, production voiced) frequency response compared to the Harman AE/OE Target.
Figure 3 (above). HEDD HEDDphone (pre-production, production voiced) total harmonic distortion (THD).
With respect to THD (Figure 3 above), we especially want to do more seatings, as there was quite a bit of noise outside our office when we were measuring -- with the Herzan isolation enclosure, the effect (if any) would be mostly in the low frequencies. Even as-is, though, those THD measurements are very impressive, in my opinion, especially through the midband and treble. It's <0.02% through much of the midrange and <0.1% through most of the treble (to 10 kHz).
It took around 290 mVrms for the HEDDphone to reach 90 dBSPL at 1 kHz. The Sennheiser HD650, in comparison, required about 196 mVrms to do the same; and the HIFIMAN SUSVARA requires around 1034 mVrms.
I'll post subjective impressions later. I'll say this now, though: The HEDDphone is a very impressive, very resolving headphone.
The measurements in this post were made using:
GRAS 45CA Headphone Test Fixture, with:
GRAS RA0401 High Resolution Ear Simulators
GRAS KB5010/KB5011 Anthropometric Pinnae for 45CA (video)
Audio Precision APx555 Audio Analyzer
THX AAA-888 audio measurement headphone amplifier (custom-built by THX)
Herzan Acoustic & Vibration Isolation Enclosure
The Harman AE/OE Target plot data was provided courtesy of Sean Olive, Harman International, Northridge, CA, USA.
So it's in the realm of planars for needing a lot of wattage in amplification.
How much does the Hifiman HE-6 & Susvara need again? Anyone know?
I power my he6se with 4 watts on my gsx mini and 200 watts off mt emotiva xpa 7.
The HIFIMAN SUSVARA we measured required 1034 mVrms to reach 90 dBSPL at 1 kHz.
EDIT 2020-01-06 14:45 EST: We just re-ran the SUSVARA, and it was 1034 mVrms (1.034 Vrms) to get to 90 dBSPL at 1 kHz. Sorry for my mistake.
I like the sound of that!
Great news. True impressions about the hedd asap!
Seem to rise a little late at the 3K peak but maintains a good level after that (the Sennheiser stuff sounds thin due to drop-off after 3K). High treble is a bit high too.
THD doesn't really mean anything. It's a bit high in some areas compared to some planars but who knows how it actually performs. I just wish this was LCD 4 levels of detail. I'm already kinda set on that as my next purchase if this can't quite touch the LCD 4.
How does the Hedd compare to the Susvara?
See previous post.
It’s not that power hungry. 2.5 watts at 42 ohms should be more than enough to get plenty loud.
The Susvara and HE6 are MUCH harder to drive.
And sensitivity? That doesn't come into the equation?
It’s listed at 87 db’s.
But you didn't list it as a parameter. And it's as important as the others, which are also listed.