HEDD Announces HEDDphone With AMT Technology
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jmills8

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Regarding bass slam? Here are some that I use on pretty much everything I demo.
Yes - The Gates of Delirium (2014 Steven Wilson remix)
Igor Stravinsky - Le Sacre du Printemps (1969 Columbia Symphony Orchestra version conducted by Boulez)
black midi - Speedway
Daughters - The Reason They Hate Me
Krallice - Wretched Wisdom (2019 remaster)
Thxs
 
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post-15401222
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Pale Rider

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I think it´s best to wait and read user´s opinions on comfort before discarding the HEDD due to weight reasons.
Well put. Hopefully, the pre-orders get fulfilled ASAP, and we can start sharing listening impressions from extended sessions in known listening environments.
 
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post-15401460
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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.

HEDD_HEDDphone_Measurements_Frequency_Response_PRELIMINARY.jpg

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.

HEDD_HEDDphone_Measurements_THD_PRELIMINARY.jpg

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:
The Harman AE/OE Target plot data was provided courtesy of Sean Olive, Harman International, Northridge, CA, USA.


 
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Thenewguy007

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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.
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?
 
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I power my he6se with 4 watts on my gsx mini and 200 watts off mt emotiva xpa 7.
 
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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?
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.
 
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I'll post subjective impressions later. I'll say this now, though: The HEDDphone is a very impressive, very resolving headphone.
I like the sound of that! :)
 
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Great news. True impressions about the hedd asap!
 
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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 HEDDphone (pre-production, production voiced) frequency response.


Figure 2 (above). HEDD HEDDphone (pre-production, production voiced) total harmonic distortion (THD).
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.
 
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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.

How does the Hedd compare to the Susvara?
 
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