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Noise Reduction

 
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johngilpin



Joined: 23 Mar 2011
Posts: 93
Location: 004
PostPosted: Mon Jun 20, 2016 1:13 am    Post subject: Noise Reduction Reply with quote
I don't know if that forwarded earmold info will get through on the list, so will re-post it here.

We all know how noisy it is to fly right in front of a 2-stroke.  This earmold might be an answer.  Seems like the way to go would be to wear these earmolds under regular earmuffs, so have double noise insulation but the radio piped right into the ears. 
 http://www.airhawk.com.au/product_details.php?  This is the Australian distributor, but I expect all that stuff is imported from the US, so must be available over there at a much better price, but I can't find the earmolds on the US Airhawk site....
JG

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PostPosted: Mon Jun 20, 2016 5:36 am    Post subject: Noise Reduction Reply with quote
JGI googled Earmold and they sell for $23.50 here. Lemme know the next time you need some & I can mail them to you at a better price!
Russ K
Quote:
On Jun 20, 2016, at 5:12 AM, JC Gilpin <j.gilpin(at)bigpond.com (j.gilpin(at)bigpond.com)> wrote:
I don't know if that forwarded earmold info will get through on the list, so will re-post it here.

We all know how noisy it is to fly right in front of a 2-stroke. This earmold might be an answer. Seems like the way to go would be to wear these earmolds under regular earmuffs, so have double noise insulation but the radio piped right into the ears.

http://www.airhawk.com.au/product_details.php? This is the Australian distributor, but I expect all that stuff is imported from the US, so must be available over there at a much better price, but I can't find the earmolds on the US Airhawk site....

JG




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Richard Pike



Joined: 09 Jan 2006
Posts: 1670
Location: Blountville, Tennessee
PostPosted: Mon Jun 20, 2016 6:19 am    Post subject: Re: Noise Reduction Reply with quote
I tried the earmold thing a few years back, the way I did it was to use a small Phillips ANR earbud headset with a regular aircraft headset over it.
Here is the Phillips ANR earbud device: http://download.p4c.philips.com/files/s/sbchn060_00/sbchn060_00_pss_enggb.pdf
I had my wife help me put the mold material in my ears and then embed the earbuds into the material and wait for it to harden.
Worked fairly well for a number of months and then the earmold material hardened up to the point it was uncomfortable.
Took the earmold material off and used the little silicone rubber end fittings instead, with a Lightspeed 20XL ANR headset over the top of that. Once again, it sort of worked, but the excess of wires made it a real nuisance. Not really much of an improvement over the Lightspeed headset by itself, which for whatever reason didn't seem to be able to keep out the prop noise.
Last week got a new Gulf Coast Avionics ANR headset, use it w/o the Phillips ANR device, it works better than anything else so far, without having to fool with 2 sets of wires.
I do find the little Phillips ANR device to be very useful for motorcycle riding, it diminishes the wind noise pretty well, and the volume control works well with the .mp3 player as it hangs in front of your chest and you can adjust it with gloves on.
Here are some sources: https://www.amazon.com/Decibullz-Earplugs-Comfortable-Protection-Concerts/dp/B00WIXL2XQ/ref=pd_sim_200_5/186-9371726-0150413?ie=UTF8&dpID=41FLhr9uFTL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=55A13WAWZNXV70G39WJR

https://www.amazon.com/Radians-CEP001-Custom-Molded-Earplugs/dp/B003A28P4I

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PostPosted: Mon Jun 20, 2016 6:47 am    Post subject: Noise Reduction Reply with quote
Or, for that price, just buy a case of foam ear plugs. They will seal more consistently and attenuate more volume than the molded stuff.

Charlie

On 6/20/2016 8:36 AM, Russ Kinne wrote:

Quote:
JG I googled Earmold and they sell for $23.50 here. Lemme know the next time you need some  & I can  mail them to you at a better price!
Russ K
Quote:
On Jun 20, 2016, at 5:12 AM, JC Gilpin <[url=mailto:j.gilpin(at)bigpond.com]j.gilpin(at)bigpond.com (j.gilpin(at)bigpond.com)[/url]> wrote:
I don't know if that forwarded earmold info will get through on the list, so will re-post it here.

We all know how noisy it is to fly right in front of a 2-stroke.  This earmold might be an answer.  Seems like the way to go would be to wear these earmolds under regular earmuffs, so have double noise insulation but the radio piped right into the ears. 

 http://www.airhawk.com.au/product_details.php?  This is the Australian distributor, but I expect all that stuff is imported from the US, so must be available over there at a much better price, but I can't find the earmolds on the US Airhawk site....

JG








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PostPosted: Mon Jun 20, 2016 6:59 am    Post subject: Noise Reduction Reply with quote
When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young

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lcottrell



Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
PostPosted: Mon Jun 20, 2016 7:14 am    Post subject: Noise Reduction Reply with quote
The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry
On Mon, Jun 20, 2016 at 8:58 AM, B Young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
Quote:

When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young


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PostPosted: Mon Jun 20, 2016 8:03 am    Post subject: Noise Reduction Reply with quote
We might need to define requirements & goals, since several people have posted. A molded plug is still a plug, unless there's a speaker or sound tube embedded in it. 

Remember that if you use regular earbuds (that don't seal up your ear canal), you won't have any trouble hearing your radio (for a while), but that's because the volume is so much louder than the noise. Eventually, your hearing will be getting worse and worse, because you're still subjecting your ears to ridiculously high volumes. 
 I used something similar to the plugfones under a pair of Lightspeeds for a while, and it's effective, but 'clunky' to deal with. I finally broke down and bought a set of QT Halos

http://www.quiettechnologies.com/
that my wife immediately stole, so I had to buy a second set. Note that I fly an RV-4, so I can't address how well they will work in a windy environment.
Something like the plugfones, wired into an over-ear headset, might be a good solution since you'd get the block in the ear canal plus the overall protection of the muff.
Charlie

On Mon, Jun 20, 2016 at 10:14 AM, Larry Cottrell <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
Quote:

The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry
On Mon, Jun 20, 2016 at 8:58 AM, B Young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
Quote:

When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young


--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.



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lcottrell



Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
PostPosted: Mon Jun 20, 2016 8:42 am    Post subject: Noise Reduction Reply with quote
Charlie,  I bought the Quiet Tech ear buds after your posting the link to them, and found that it was still noisier than I preferred. With the "squeezable foam plugs it was better, but they made my ears itch so bad that I changed to the flexible rubber. I found the mike to be floppy enough that it was a distraction. I finally began putting my headset back on over them just to cut out some of the noise through the bones around my ears. The Quiet buds are in the back of my plane as a spare now. The Sig 40 headset and the speaker buds work better for "me". 
If I was flying an RV I would go back to the Quiet buds over the other, but the noise factor is much greater in the Kolb. In any case the test for these runs about $12 bucks and some time, my spare set cost in excess of $300. Not complaining, "just saying"
Larry 

On Mon, Jun 20, 2016 at 10:03 AM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
We might need to define requirements & goals, since several people have posted. A molded plug is still a plug, unless there's a speaker or sound tube embedded in it. 

Remember that if you use regular earbuds (that don't seal up your ear canal), you won't have any trouble hearing your radio (for a while), but that's because the volume is so much louder than the noise. Eventually, your hearing will be getting worse and worse, because you're still subjecting your ears to ridiculously high volumes. 
 I used something similar to the plugfones under a pair of Lightspeeds for a while, and it's effective, but 'clunky' to deal with. I finally broke down and bought a set of QT Halos

http://www.quiettechnologies.com/
that my wife immediately stole, so I had to buy a second set. Note that I fly an RV-4, so I can't address how well they will work in a windy environment.
Something like the plugfones, wired into an over-ear headset, might be a good solution since you'd get the block in the ear canal plus the overall protection of the muff.
Charlie

On Mon, Jun 20, 2016 at 10:14 AM, Larry Cottrell <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
Quote:

The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry
On Mon, Jun 20, 2016 at 8:58 AM, B Young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
Quote:

When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young


--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.






--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.

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PostPosted: Mon Jun 20, 2016 8:44 am    Post subject: Noise Reduction Reply with quote
​I use Bose QC20 active noise canceling ear buds under my head set​. They work about as good as it gets at cutting noise and the radio reception is so good I can recognize voices. I find that the active nose canceling kit in my Sigtronics doesn't help much when the Bose ear buds are on. I don't find the wires to be much of a issue. My eye glass bows are a pain but not the wires. Anyway the list price is $300 but I have found them on E-Bay for under $200.
Rick Neilsen
Redrive VW Powered MKIIIC
On Mon, Jun 20, 2016 at 12:03 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
We might need to define requirements & goals, since several people have posted. A molded plug is still a plug, unless there's a speaker or sound tube embedded in it. 

Remember that if you use regular earbuds (that don't seal up your ear canal), you won't have any trouble hearing your radio (for a while), but that's because the volume is so much louder than the noise. Eventually, your hearing will be getting worse and worse, because you're still subjecting your ears to ridiculously high volumes. 
 I used something similar to the plugfones under a pair of Lightspeeds for a while, and it's effective, but 'clunky' to deal with. I finally broke down and bought a set of QT Halos

http://www.quiettechnologies.com/
that my wife immediately stole, so I had to buy a second set. Note that I fly an RV-4, so I can't address how well they will work in a windy environment.
Something like the plugfones, wired into an over-ear headset, might be a good solution since you'd get the block in the ear canal plus the overall protection of the muff.
Charlie

On Mon, Jun 20, 2016 at 10:14 AM, Larry Cottrell <lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
Quote:

The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry
On Mon, Jun 20, 2016 at 8:58 AM, B Young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
Quote:

When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young


--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.




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PostPosted: Mon Jun 20, 2016 9:40 am    Post subject: Noise Reduction Reply with quote
Bummer that the Halo didn't work out; they certainly aren't cheap (just be glad you didn't spring for one of the other brands; they are almost twice as much). I use the silicone plugs, but you're right; they don't cut as much volume as the foam ones. They are 'good enough' for my application, and much easier/faster to 'install'.

Not to beat a dead horse, but...Having lost a significant percentage of my hearing, I tried to educate myself on where the risks are & how to abate them as much as is reasonably possible. I know that ear buds will get loud enough to hear comms over noise, but if it's too noisy to hear with an over the ear headset, then the buds are just adding to an already too-loud 'ear-vironment'. The potential for long term hearing quality is not good in that situation.

FWIW...

On 6/20/2016 11:42 AM, Larry Cottrell wrote:

Quote:
Charlie,   I bought the Quiet Tech ear buds after your posting the link to them, and found that it was still noisier than I preferred. With the "squeezable foam plugs it was better, but they made my ears itch so bad that I changed to the flexible rubber. I found the mike to be floppy enough that it was a distraction. I finally began putting my headset back on over them just to cut out some of the noise through the bones around my ears. The Quiet buds are in the back of my plane as a spare now. The Sig 40 headset and the speaker buds work better for "me". 


If I was flying an RV I would go back to the Quiet buds over the other, but the noise factor is much greater in the Kolb. In any case the test for these runs about $12 bucks and some time, my spare set cost in excess of $300. Not complaining, "just saying"
Larry 

On Mon, Jun 20, 2016 at 10:03 AM, Charlie England <[url=mailto:ceengland7(at)gmail.com]ceengland7(at)gmail.com (ceengland7(at)gmail.com)[/url]> wrote:
Quote:
We might need to define requirements & goals, since several people have posted. A molded plug is still a plug, unless there's a speaker or sound tube embedded in it. 

Remember that if you use regular earbuds (that don't seal up your ear canal), you won't have any trouble hearing your radio (for a while), but that's because the volume is so much louder than the noise. Eventually, your hearing will be getting worse and worse, because you're still subjecting your ears to ridiculously high volumes. 


 I used something similar to the plugfones under a pair of Lightspeeds for a while, and it's effective, but 'clunky' to deal with. I finally broke down and bought a set of QT Halos

http://www.quiettechnologies.com/
that my wife immediately stole, so I had to buy a second set. Note that I fly an RV-4, so I can't address how well they will work in a windy environment.


Something like the plugfones, wired into an over-ear headset, might be a good solution since you'd get the block in the ear canal plus the overall protection of the muff.


Charlie

On Mon, Jun 20, 2016 at 10:14 AM, Larry Cottrell <[url=mailto:lcottrell1020(at)gmail.com]lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)[/url]> wrote:
Quote:

The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry


On Mon, Jun 20, 2016 at 8:58 AM, B Young <[url=mailto:byoungplumbing(at)gmail.com]byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)[/url]> wrote:
Quote:

When I've tried foam plugs I can't hear my radio.   I've seen these and been going to try a pair, but haven't yet ordered a pair. 
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young




--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.

















--
The older I get, the less tolerant I am of those who are intolerant of others.


If you forward this email, or any part of it, please remove my email address before sending.












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lcottrell



Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
PostPosted: Mon Jun 20, 2016 10:07 am    Post subject: Noise Reduction Reply with quote
Nothing will change the noise put out by the engine, other than a helmet. However the volume that is needed to over come the engine noise is something that you can regulate by having the sound input within the ear, rather than having to overcome the existing noise. As I said I came to the conclusion that the engine noise was less with the headset on over the ear buds. However the bones of your head and ear structure still transmits the noise, just in a more round about way.

The Quiet buds were a definate improvement. The only hassle with them was the mike support, it would not stay in one place. However the cheap ear buds soldered to the speakers was even better for me. 
-----------------------------------------------------------------------------------------------------------------------------Charlie wrote-
Not to beat a dead horse, but...Having lost a significant percentage of my hearing, I tried to educate myself on where the risks are & how to abate them as much as is reasonably possible. I know that ear buds will get loud enough to hear comms over noise, but if it's too noisy to hear with an over the ear headset, then the buds are just adding to an already too-loud 'ear-vironment'. The potential for long term hearing quality is not good in that situation.FWIW...

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PostPosted: Mon Jun 20, 2016 12:15 pm    Post subject: Noise Reduction Reply with quote
I use a noise canceling setup from headsets inc in my 30 year old David Clarks H10 30's. I fly a mk3 c with a direct drive Jabiru that turns over 3000 on take off. The noise it generates is unbelievable. But at cruise power,The intercom and radio functions adequately , but only because I insulated the center overhead with densofoam. The wing root ends, spar carry through and top and bottom, all on the inside. Also the rear facing windows that were between me and the prop. But I think the wing skins are drummed by prop passes and it drives the sound into the cabin through the wing root ends.
A couple of the guys have flown in my ship, Rick and Beauford I think. They probably have an opinion on the sound from my setup. The addition of insulation on the root ends was the difference for me.
Sent from my iPhone

On Jun 20, 2016, at 1:43 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
Bummer that the Halo didn't work out; they certainly aren't cheap (just be glad you didn't spring for one of the other brands; they are almost twice as much). I use the silicone plugs, but you're right; they don't cut as much volume as the foam ones. They are 'good enough' for my application, and much easier/faster to 'install'.

Not to beat a dead horse, but...Having lost a significant percentage of my hearing, I tried to educate myself on where the risks are & how to abate them as much as is reasonably possible. I know that ear buds will get loud enough to hear comms over noise, but if it's too noisy to hear with an over the ear headset, then the buds are just adding to an already too-loud 'ear-vironment'. The potential for long term hearing quality is not good in that situation.

FWIW...

On 6/20/2016 11:42 AM, Larry Cottrell wrote:

Quote:
Charlie, I bought the Quiet Tech ear buds after your posting the link to them, and found that it was still noisier than I preferred. With the "squeezable foam plugs it was better, but they made my ears itch so bad that I changed to the flexible rubber. I found the mike to be floppy enough that it was a distraction. I finally began putting my headset back on over them just to cut out some of the noise through the bones around my ears. The Quiet buds are in the back of my plane as a spare now. The Sig 40 headset and the speaker buds work better for "me".


If I was flying an RV I would go back to the Quiet buds over the other, but the noise factor is much greater in the Kolb. In any case the test for these runs about $12 bucks and some time, my spare set cost in excess of $300. Not complaining, "just saying"
Larry

On Mon, Jun 20, 2016 at 10:03 AM, Charlie England < (ceengland7(at)gmail.com)ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
Quote:
We might need to define requirements & goals, since several people have posted. A molded plug is still a plug, unless there's a speaker or sound tube embedded in it.

Remember that if you use regular earbuds (that don't seal up your ear canal), you won't have any trouble hearing your radio (for a while), but that's because the volume is so much louder than the noise. Eventually, your hearing will be getting worse and worse, because you're still subjecting your ears to ridiculously high volumes.


I used something similar to the plugfones under a pair of Lightspeeds for a while, and it's effective, but 'clunky' to deal with. I finally broke down and bought a set of QT Halos

http://www.quiettechnologies.com/
that my wife immediately stole, so I had to buy a second set. Note that I fly an RV-4, so I can't address how well they will work in a windy environment.


Something like the plugfones, wired into an over-ear headset, might be a good solution since you'd get the block in the ear canal plus the overall protection of the muff.


Charlie

On Mon, Jun 20, 2016 at 10:14 AM, Larry Cottrell < (lcottrell1020(at)gmail.com)lcottrell1020(at)gmail.com (lcottrell1020(at)gmail.com)> wrote:
Quote:

The issue for me was solved with the suggestion to solder a set of ear buds to the speakers inside the headphones. This both plugs the ears and puts the sound right in the ear canal. I can assure you that you will turn your volume down. You will still get a lot of noise from the engine and the prop that travels through the bones in your head, but to me it is better that AN headphones. Cost from Wally world is about $12.00
Larry


On Mon, Jun 20, 2016 at 8:58 AM, B Young < (byoungplumbing(at)gmail.com)byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
Quote:

When I've tried foam plugs I can't hear my radio. I've seen these and been going to try a pair, but haven't yet ordered a pair.
https://www.plugfones.com/shop/
Has anyone tried them?
Boyd young




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John Hauck



Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
PostPosted: Mon Jun 20, 2016 1:02 pm    Post subject: Noise Reduction Reply with quote
Makes sense to me, Gary A.

Had not considered the wings and the inboard ends.

I've been thinking about the tail boom resonating like a snare drum every time a blade tip zips past it.  At one time I only had 3/4" tip clearance.  Now I have 1.5".  May be a little less noisy now.

If I have trouble understanding a transmission, I pull back on the throttle a little until my communication is complete.

Gets real quiet with no power.  Wink

john h
mkIII
Titus, Alabama




From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Gary Aman
Sent: Monday, June 20, 2016 3:15 PM
To: kolb-list(at)matronics.com
Subject: Re: Noise Reduction

I use a noise canceling setup from headsets inc in my 30 year old David Clarks H10 30's. I fly a mk3 c with a direct drive Jabiru that turns over 3000 on take off. The noise it generates is unbelievable. But at cruise power,The intercom and radio functions adequately , but only because I insulated the center overhead with densofoam. The wing root ends, spar carry through and top and bottom, all on the inside. Also the rear facing windows that were between me and the prop. But I think the wing skins are drummed by prop passes and it drives the sound into the cabin through the wing root ends.
A couple of the guys have flown in my ship, Rick and Beauford I think. They probably have an opinion on the sound from my setup. The addition of insulation on the root ends was the difference for me.

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama
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PostPosted: Wed Jun 29, 2016 7:38 pm    Post subject: Noise Reduction Reply with quote
We had a discussion a while ago about ways to reduce noise in our Kolbs. I just flew tonight and tried to evaluate how quiet it is now with my current headsets. I fly with Bose QC-20 noise canceling ear buds under my Sigtronics over the ear headset with the Headset noise canceling kit. I plug my Bose ear buds into my intercom to hear and my Sigronics microphone into my intercom to speak. At cruise it is like sitting in my living room with a truck idling out side the house. I can hear the low tones of the engine in the back ground but I can hear voices on the radio at normal indoor volumes. When I talk, the intercom opens the microphone so I can hear more noise till the squelch cuts it off.
When I started the engine tonight I had the Bose ear buds in my ears but turned off so I could hear the engine sounds clearly. Then I turned on the Bose noise canceling and that cut the idle engine noise to a reasonable level. Then I put the Sigtronics headset on with the Sigtronics noise canceling off. This cut out most of the high frequency noise. Then I turned on the Sigtronics noise canceling kit. Not much change. In the air with my big VW turns 3200 RPM at app 60% cruise power. If I turn the Sigtronics noise canceling kit off I can hear the engine sounds better so I turn if off from time to time to check the health of the engine. My engine turns only 3600 at full power (it is loud!) so most of the noise is lower frequency which noise canceling does a pretty good job of canceling.
Rotax engines turn more RPMs creating a higher frequency noise which noise canceling doesn't work as well to cancel. My understanding is that higher frequencies are easier to reduce with passive aviation head sets but I don't know for sure. I other words I don't know how well my setup will work for you.
Anyway it sure is nice not having my old ears ringing after every flight.
Rick Neilsen
Redrive VW Powered MKIIIC

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zeprep251(at)aol.com
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PostPosted: Thu Jun 30, 2016 4:51 am    Post subject: Noise Reduction Reply with quote
Rick,what rpm does your prop turn when the vw is at 3600.You still running the Valley redrive unit?
Quote:
On Jun 29, 2016, at 11:04 PM, Rick Neilsen <neilsenrm(at)gmail.com (neilsenrm(at)gmail.com)> wrote:
We had a discussion a while ago about ways to reduce noise in our Kolbs. I just flew tonight and tried to evaluate how quiet it is now with my current headsets. I fly with Bose QC-20 noise canceling ear buds under my Sigtronics over the ear headset with the Headset noise canceling kit. I plug my Bose ear buds into my intercom to hear and my Sigronics microphone into my intercom to speak. At cruise it is like sitting in my living room with a truck idling out side the house. I can hear the low tones of the engine in the back ground but I can hear voices on the radio at normal indoor volumes. When I talk, the intercom opens the microphone so I can hear more noise till the squelch cuts it off.

When I started the engine tonight I had the Bose ear buds in my ears but turned off so I could hear the engine sounds clearly. Then I turned on the Bose noise canceling and that cut the idle engine noise to a reasonable level. Then I put the Sigtronics headset on with the Sigtronics noise canceling off. This cut out most of the high frequency noise. Then I turned on the Sigtronics noise canceling kit. Not much change. In the air with my big VW turns 3200 RPM at app 60% cruise power. If I turn the Sigtronics noise canceling kit off I can hear the engine sounds better so I turn if off from time to time to check the health of the engine. My engine turns only 3600 at full power (it is loud!) so most of the noise is lower frequency which noise canceling does a pretty good job of canceling.

Rotax engines turn more RPMs creating a higher frequency noise which noise canceling doesn't work as well to cancel. My understanding is that higher frequencies are easier to reduce with passive aviation head sets but I don't know for sure. I other words I don't know how well my setup will work for you.

Anyway it sure is nice not having my old ears ringing after every flight.

Rick Neilsen
Redrive VW Powered MKIIIC




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John Hauck



Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
PostPosted: Thu Jun 30, 2016 5:16 am    Post subject: Noise Reduction Reply with quote
You are right, Rick N.  ANR is designed for lower frequency noise, like much slower turning engines than the Rotax two and four cycle engines.  The 912ULS easily overpowers my ANR headset.  Already deaf, I am right on the edge of not being able to understand communications with others.  With a passive headset, I am lost.

Larry C's set up works well.  If I was going to be doing a lot of long cross country flights in the future I'd probably go with Larry's set up or spend the money and go with Rick N's set up.

There was a time I could hear well with a passive David Clark.  I lost my hearing in VN 50 years ago.  Got a chance to go to Army helicopter school two years later.  Had to cheat a bit to pass the flight physical.  Never had a problem being able to hear and understand communications with a flight helmet, even though I could not pass the hearing test.  Right now my ears are ringing louder than my Rotax.  Wink

Don't think my hearing loss will ever ground me.  There is no requirement to have a radio in my MKIII.  I am legal, with a radio, to fly into non-towered airfields in the US.  Don't plan to fly back to Canada, so I good there.

john h
mkIII
Titus, Alabama

From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Rick Neilsen
Sent: Wednesday, June 29, 2016 10:05 PM
To: kolb-list(at)matronics.com
Subject: Noise Reduction




Rotax engines turn more RPMs creating a higher frequency noise which noise canceling doesn't work as well to cancel. My understanding is that higher frequencies are easier to reduce with passive aviation head sets but I don't know for sure. I other words I don't know how well my setup will work for you.



Anyway it sure is nice not having my old ears ringing after every flight.



Rick Neilsen

Redrive VW Powered MKIIIC

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John Hauck
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hauck's holler
Titus, Alabama
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