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The Driver Geometry of the Grell headphones
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jayfrankgg
3
Mar 15, 2024
Will the limited edition end upon first release? Or will production continue until 3-4 years later? legoking1977
8
Mar 18, 2024
Yes I did, I'd say I preferred them to 6xx, felt very spacy. I do prefer hd800 to them still, but that's a very large price gap! I'd say jazz is where they preform best.
carebearstare
7
May 19, 2024
legoking1977I'm scared of that bass in the raw frequency response curve chart. How do they actually sound, I imagine it's completely different since the drivers are angled so steeply. I like my 6xx BECAUSE they don't hurt my ears with bass, not despite that.
mariant
107
Mar 10, 2024
This looks like a gimmick to me. There are some fundamental differences between speakers and headphones that may be impossible to address solely with the geometry of the transducer or the cup:
With speakers, both ears hear sound from both speakers. With headphones, each ear hears only the sound from one transducer.
The cup creates a small resonant cavity that doesn't exist when listening to speakers. That creates coloration in addition to that created by the pinna.
The pinna's shaping of the sound depends on where the sound comes from. When you rotate your head when listening to speakers, that direction changes. When you do that with headphones, nothing changes.
(Edited)
Evshrug
4130
Keyboard Club Member
Mar 19, 2024
I read your point, and I agree it is part of the localization equation and yet an incomplete part. I think Axel wanted to acknowledge you too, because consumers and manufacturers are both on team “great sound.” Creating true localization JUST with passive headphones (and no DSP tools) won’t really work – nobody disagrees with you there. But I think his point was pretty clearly addressing the primary reason for the design:
“The second more important reason is the right individual "tonality" in the frequency range above 1.5 kHz as our Ear related transfer functions (ERTFs) are very different in that range. A headphone sounds completely different to a listener with a different ear geomety than the headphone designer when the driver placement is done in the traditional 90° (270°) position.”
I’ve heard some good IEMs, but over ear open headphones still sound the most natural because they don’t bypass that outer ear pinna. An angled driver takes the listener’s ear into consideration for final tuning, while a 90° perpendicular “flat” driver tries to force its own color by bypassing the reflections of our outer ear folds and wrinkles. Our ears are the other half of the audio chamber created with headphones. Your ears are different from mine (more unique than fingerprints), so the appearance of “natural” requires our ear’s filter to “EQ” it the same way our free ears do.
At the end of the day, we’ll need to see several reviews and ideally hear things for ourselves to be sure, but Mr. Grell has a long history of success and he’s putting it on the line to self-produce this. He believes in it. From what I’ve preferred with the HD 800S and the angled driver modern HD 500 series, I’m hopeful.
mariant
107
Mar 19, 2024
Had the Realiser been $1000, I would have probably gotten it. There's also the AirPods Max, which seem to have head tracking and immersive tech, but I'm not in the Apple ecosystem and I don't want to be. Anyway, I've been toying with the idea of building an immersive headphone myself, with some encouraging preliminary results. I'll continue on that when I have some time.
AxelGrell
165
Grell Audio
Mar 12, 2024
What doesn't it work for? Have you understood what I want to achieve? I think there is a fundamental misunderstanding. Please read my answer to mariant above. I hope that makes it clear.
Evshrug
4130
Keyboard Club Member
Mar 18, 2024
There’s a single driver for each ear, and the goal is natural tone.
ThePastPerfectTense
4
Mar 9, 2024
Grado pads???!!! NNNNOOOOOOooooOOOOoOoOOO!!!! PPPLLLLSSSSsssSsSSSS!!!
Evshrug
4130
Keyboard Club Member
Mar 9, 2024
ThePastPerfectTenseThose look like Velour pads to me… and I am pretty sure they will be. All the OAE1 prototypes in pictures from past CanJams have been velour-wrapped pads too.
Grado pads leak and make a very, shall we say, mild seal (I bought my dad a pair of Grado and he likes them, when my step-mom isn’t around to be irritated by the sound). The control of airflow (and pressure) is very important to sound, and grell knows that the pads will be very responsible for bass extension and avoiding the lighter bass pressure the AKG K1000 was capable of.
PiedPiper
24
May 6, 2024
Great thank you for your contributions. HD 800S was my daily driver before I had to part with it. Tried out the HE1000SE, but it cannot compete when it comes to the vocals. So I have been eyeing on this OAE-1 ...
Evshrug
4130
Keyboard Club Member
May 7, 2024
PiedPiperI’m sorta freaking out because I’m trying to write this review anticipating what everyone will want to know about it 😂 I’ve been at it all weekend and today so far, because I didn’t have to work today I actually took off work 😅
PiedPiper
24
Mar 8, 2024
Does anybody know the material properties of biocellulose material used in this or other headphones compared to berillyum/aluminium ?
(Edited)
Buidoimiennui
3
Jul 4, 2024
PiedPiperWith experience when exposed to this type of driver. They have advantages but also disadvantages, the advantage is high performance, the entire speaker membrane is moved almost linearly, instead of the middle moving a lot and the edges moving a little like resin membranes. often. This type of driver is constructed like a rubber-ribbed paper speaker. The disadvantage is that their diaphragm is as soft as silk, and is sensitive to temperature. They are quickly damaged and change hardness over time.
ave.runcus
1
Mar 9, 2024
Kira-oinkI don't think a bio-cellulose dynamic driver will cost even $20 usually (of course this could vary by order quantity). I believe this headphone's cost will mostly reflect R&D, which makes sense since it's a proof-of-concept. Just generally in mid-fi the majority will be R&D, especially for dynamic drivers that represent lower labor costs. You can actually look online to see how much such drivers cost.
Evshrug
4130
Keyboard Club Member
Mar 9, 2024
ave.runcusYeah, Bose drivers do impressive things considering they’re made of paper. Headphones really are a case of the whole being greater than the sum of their parts. But still, I don’t expect it to be thousands of dollars.
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Listening with Typical Headphones Most headphones have speakers positioned so that their membrane is perpendicular to an imaginary axis through both ears. This creates a sound field at each ear that corresponds to the sound field produced by a voice, instrument, or loudspeaker located directly on this axis on each respective side. The sound is coming from the far left or far right.
Listening with Drop + Grell OAE1 Signature Headphones The speakers of the Drop + Grell OAE1 are positioned so that their bio-cellulose diaphragm is at an angle to the ear, radiating sound waves like a sound source in front of the listener. This positioning also corresponds to the direction of sound incidence (first wavefront) of loudspeakers that are optimally positioned for stereo reproduction.