Wireless passive speaker. Possible?

Oct 11, 2020 12 Replies

Motorcycling is noisy business (wind, not exhaust), so I need to wear earplugs under the helmet.



I have a Bluetooth based comms system in the helmet. When I crank it up maximum volume, it is almost loud enough, at least at low speeds.



I can buy reusable earplugs with speakers in them, but I can only find wired ones.



The space available is limited. The device can not protrude from the ear, as it would interfere with the helmet. The outer ear cavity could be used, though.



I am thinking it might be possible to make a reusable earplug with the speaker in the ear canal and a coil (or other energy receiver) in the outer ear, and then replace the speakers in the helmet with another coil or other transducer. Is it as simple as a coil on each side?



The distance is small, and the amount of power required is also small.



Ideas?


RoRo

You can get bluetooth ear buds that make a decent seal.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com

I did a search for wireless in helmet or under helmet earbuds and ran across a few. Like these

OR

On Amazon

I ride so have some idea what you're after but must be missing something. The sound of the wind suits me.

I have been searching for a while. The ones that look primising are expensive enough that I can't simply buy them to see if they will work.

My current favorite disposable ear plugs (3M 1100) provide 37 dB noise reduction. I can't imagine a music device getting anywhere close.

And, I was hoping to avoid another battery to charge.

RoRo

Please try the difference. You will never go back. The experience is, of course, very strange at first, so you will need to give yourself a few days to get used to the new sensation.

Several years back, I read an article about a test that had been performed with a variety of helmets. Even the quietest ones were well above harmful noise levels.

The type of noise is very wide band, so I does not feel "ear piercingly" loud, but there is a lot of energy hammering your ears.

RoRo

No, it's the wind going through a helmet that makes things loud. The exhaust noise is left largely behind.

That might be the sensible thing to do but it would diminish the bad boy image. Bikers tend to get in the passing lane and stay there. Cops don't make too big a deal of it usually. I'm not sure where the wind becomes an issue. I'm more or less used to it and wear the cheap plastic plugs. My favorite place to ride is the Nebraska Sandhills. That's where the cattle ranches are. It's a long ways between towns and there isn't much traffic. Link here to some pictures if you're interested.

OR

There's a golf course there rated at number 9 in the U.S. Some pictures from Golf Digest:

I've been using Shure SE215s for a long time; first the wired version with no mic, now the Bluetooth version with a mic (since the 3.5mm plug was eliminated from my new phone... grrr.)

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Specs say 37dB! I mostly believe it; I don't have a good way to measure that, but they do a damned fine job at eliminating all of the noise that my cow-orkers put out :)

I ride a K1300GT and at highway speeds the wind noise is annoying, so I too wear earplugs. I do find that the regular ear plugs dampen the wind noise enough that I can actually hear my Sena Bluetooth helmet speakers fairly clearly - enough to answer the phone and listen to podcast talks.

Certainly much clearer than I can when not wearing earplugs.

These are good quality acoustic earplugs, not the foam ones you get by the box full for noisy workplaces...

John :-#)#

An ideal solution for bikers is something that cuts most of the wind noise but allows one to hear things like car horns. It would really be nice if there was some gizmo that would adjust for headwind. The Center for Disease Control puts normal conversation at 60 dB. Potential hearing loss can start at 70 dB over time. Some states don't allow the stuff RoRo is asking about.

Have you asked on uk.rec.motorcycles? That group is still fairly active.

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