San FranciscoI would love to have these toys. I wish I had a way to rent them 
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Eargo 8 review from an experienced user
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PolandYou’re ignoring this member’s posts.
Yes. I was getting weird results with the coupler but I suppose it’s useful for relative output comparison!
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I got the in eBay. Much cheaper than the interacoustics but from the mid 2000s and I had to get an old computer and search for firmware as it doesn’t run on modern Windows. Certainly a process. I think it was like $3000 all in.
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I couldn’t get the coupler to work out to my liking.
I got this styrofoam head for $15 and silicone ears for $20 from Amazon this week. I cut holes in the styrofoam ears and screwed these silicone ears in.
The ears are used to train audiology students and hearing aid technicians to make ear molds. The canal measures exactly 30 mm and holds 2 mm of volume, which I tested by squirting water from a syringe. I had to cut the tragus off because they were occluding the canals too much.
I’ve already tested the Phonaks, and the is virtually identical to my own ears, with a few variation here and there.
I’m thinking of putting up some YouTube videos of testing the various to see how close they come to my prescription.
My wife walked in and jumped back… “What in the world are you doing NOW!!!?”
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tenkanProvider
Bloody hell mate, now this is staring to get real interesting! you may need to convince the wife every thing’s ok…for now anyway.
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Oh, she’s used to my nonsense, though the head on the dresser in a darkened room wasn’t what she expected when she arrived home LOL
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YouTube video incoming soon with me and Cliff the mannequin, comparing otc hearing aids to a prescription Phonak. I’ll update when it drops. Complete with a Dr. Cliff level thumbnail lol!
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Will read. I love to learn. It’s arriving November 2. Thank you!
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Wow, things escalated quickly 
The next interesting book is “Fitting and dispensing hearing aid” by Brian Taylor (make sure about newest edition) but it is possibly not about .
Another good book are Harvey Dillon’s ones.
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I did NAL-HL2 (On my own ears! Not Cliff the mannequin!) at soft, medium, and loud with the Phonak Lumity L90 and the Eargo 8. The curves are surprisingly remarkably similar!
Does anyone know why both hearing aids dip at the 50 input between 3 and 5 to 6 kHz? I maxed out the compression on the Phonak, trying to chase that dip.
Is it ear-canal standing-wave interference or automatic feedback-notch filtering? I moved the tube further and closer to my tympanic membrane with no difference.
In my Fonix-35 test box, the FOG of the Eargo was 25 dB and 106dB OSPL90.
Phonak Lumity vs Eargo 8 REM at 50,65, and 80 2
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Does anyone know why both hearing aids dip at the 50 dB input between 3 and 5 to 6 kHz?
It depends on receiver capabilities. See datasheet from section for professionals on Phonak page. There is probably similar dip. G50 means the largest necessary gain so you’re closer/at potential.
IIRC, I probably have the same dip.
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Do you have M P receivers? IIRC, that graph resembles possible maximum output of M P. EDIT: My mistake - in question should be P receiver, there’s comparison of mine P receiver graph (upper, before firmware update) compared to yours (lower): [20251022_161150]
Here is another examples of the dips.
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I have a P receiver in the right ear and manually overode the in that frequency.
I’m at work now but will take a closer look at that tomorrow. Thanks!
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You’re welcome. These are magnitudes better than the Ceretone Core One Pro mentioned in another thread
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I’ve confirmed that, doing full 3-level (50,65,80) curves, the Eargo 8 is the only hearing aid that I tested with prescription-grade compression (the Sony CRE-C10 and Ceretone have ZERO compression, and the Zepp Clarity Pixie has compression but over a lower frequency range), basically allowing the Eargo 8 to all but match the Phonak Lumity:
OTC Hearing Aid Real Ear Measurement Compression curves vs Rx Phonak Lumity Hearing Aid (50,65,80 dB)2
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![[20251022_161150]](/uploads/original/eb6a4a99da44fd2477912069f0a39b26a6249ac0.jpeg){kind=link}
Amazing work @DrJimmyJoeJimbob, very impressive!
It made me wonder if any of the reviews on HearAdvisor mention the fact that they don’t do compression. At least for the Sony CRE-C10, they don’t:
The Sony CRE-C10 is a mid-priced OTC hearing aid that fits invisibly in the ear and uses disposable batteries. It achieved a SoundGrade of A and sits in the top 30% of devices in the OTC category and in the top 35% of all devices tested.
If you look very closely at the gain graph, you can see it. But you have to know what to look for. Rx target varies a lot, but output gain stays almost constant. It confirms @DrJimmyJoeJimbob’s findings:
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