Bose A20 aviation headset
Join Date: May 2006
Location: Europe
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Is there any way to find out if your aircraft is high or low impendence?
I tried a normal A20 for airplane with a plug converter, and the mic did not work. Do I require high or low impendence?
Thanks
I tried a normal A20 for airplane with a plug converter, and the mic did not work. Do I require high or low impendence?
Thanks
Last edited by fokkerpilot; 24th Feb 2012 at 17:37.
Join Date: Nov 2010
Location: Australia/SEA
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Impedance for C++ and 225
Hello
Does anybody know if the Bose A20 needs a high impedance lead for:-
- An S76 C++
- An EC225 (I think it uses low on the 225 but am not sure)
If I fly different types which use both high and low impedance respectively, will I be able to get both a high and low impedance lead for one headset, or will it mean having to buy two headsets?
We operate a few types and just want to make sure before I get a headset.
Thanks in advance
Does anybody know if the Bose A20 needs a high impedance lead for:-
- An S76 C++
- An EC225 (I think it uses low on the 225 but am not sure)
If I fly different types which use both high and low impedance respectively, will I be able to get both a high and low impedance lead for one headset, or will it mean having to buy two headsets?
We operate a few types and just want to make sure before I get a headset.
Thanks in advance
Join Date: Mar 2009
Location: Beside the seaside
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There is no need to buy another headset. It is only the microphone that has the impedence issue. Buy two (one high and one low) and then simply plug in the one you need at the time. Much cheaper
Last edited by Epiphany; 17th May 2012 at 19:58.
Join Date: Apr 2008
Location: london
Age: 45
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Best Price for the A20
Does anyone know where online you can get the best deal for a Bose A20 Headset?
Either in the USA or UK preferably and from a reputable supplier.
Thanks
Either in the USA or UK preferably and from a reputable supplier.
Thanks
Join Date: Apr 2003
Location: Den Helder
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Anyone know if
A20® aviation headset with U174 helicopter plug and Bluetooth®
Will work in R44 and AW139 ? The 139 has the drop down leads with the NATO socket on the end of the cable.
I am guessing they are both high impedance, is this right ?
Cheers
A20® aviation headset with U174 helicopter plug and Bluetooth®
Will work in R44 and AW139 ? The 139 has the drop down leads with the NATO socket on the end of the cable.
I am guessing they are both high impedance, is this right ?
Cheers
Join Date: Jul 2008
Location: Australia
Age: 49
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A20 and thick templed eyeglasses
I have a set of the A20. I am about to get new corrective lenses and frames. The frames I am looking at though have a relatively thick tremple. the Bose site stipulates that thick temples may interfere with the noise cancelling properties of the headset.
Has anyone had any experience with wearing thick templed glasses with the A20?
Has anyone had any experience with wearing thick templed glasses with the A20?
Join Date: Jun 2012
Location: DeepSpace
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@Elias.K Thick temples affect noise reduction a lot. I went through a lot of sunglasses to find ones which affected it the least.
@SFIM A20 work in R44/22 directly for me, no idea about AW139 or Hi-Z Lo-Z
@SFIM A20 work in R44/22 directly for me, no idea about AW139 or Hi-Z Lo-Z
Join Date: Jul 2008
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@EternalRookie .. How did you test it with so many sunnies? did you take the headset to the store?
Just when i thought I found the glasses i like, I'm going to have to find something else.
Just when i thought I found the glasses i like, I'm going to have to find something else.
Join Date: Jun 2012
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I bought el-cheapos from various 7-11's and ebay till I found a style that did the job and fit my face. That way I was able to give them a decent try out. Then I ordered a decent pair that matched the cheapies.
I ended up settling on these Quantum Promo Store
The temple is thin enough not to break the seal against my head. Springy hinges seem to help too. Lucked out and got them for half price off ebay with the hard case.
I ended up settling on these Quantum Promo Store
The temple is thin enough not to break the seal against my head. Springy hinges seem to help too. Lucked out and got them for half price off ebay with the hard case.
Bose A20 ANR squeal
Scroll past the rave "review" at the top of
Bose A20 review. Another leap in ANR. | The Joy of Aviation
to the comments section: "Erin" and "Bob" found their A20s to squeal,
and "Fred" shows how to reproduce that:
I did appr. 10h helicopter training using A20s - hence not qualified to judge - but found that only seriously catching the cord somewhere makes the ANR go crazy, read fail.
Anyone else got that "A20 squeal" and grinding his/her teeth for having to live with that?
Can someone please repeat "Fred's test" with a Zulu2, preferrably side be side with some A20s?
I'm a little bit worried, as I was on the brink of shelling out a grand for an A20..
Bose A20 review. Another leap in ANR. | The Joy of Aviation
to the comments section: "Erin" and "Bob" found their A20s to squeal,
and "Fred" shows how to reproduce that:
You do not even need to be in the cockpit to reproduce the problem. You just need to put the ANR on (yes this is an ANR issue). Then you put the headset on your head and you press the ear cups towards your head (after a while in flight the seals are always a little bit compressed). Then you remove the ear cups at different speeds. Try this a few times and you will hear the squeak/squeal sound for sure! In flight this happens naturally when the headset is moving a bit when you touch at the mike or move your head rapidly for instance. Conclusion: All Bose A20 have a serious ANR design problem!
Anyone else got that "A20 squeal" and grinding his/her teeth for having to live with that?
Can someone please repeat "Fred's test" with a Zulu2, preferrably side be side with some A20s?
I'm a little bit worried, as I was on the brink of shelling out a grand for an A20..
Last edited by Reely340; 15th Oct 2012 at 08:38.
Never had a problem myself. I fly Robinson, Eurocopter and Bell - just back from a flight today and tried the 'Fred test' but couldn't reproduce the 'A20 squeal' either..
Join Date: Jun 2008
Location: Big Island
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I've had the squeal the last two times I've flown. The only difference was I changed batteries. I've gone from the Duracell to Energiser Lithium.
Might have to play around with that.
Might have to play around with that.
Not sure if it helps but some lithium batteries last longer but have a slightly lower voltage, this may be the cause of ANR problems.
I have used my A20s for about 30 hours and they are great, but you do have to make sure the seal is good around your ears.
I have used my A20s for about 30 hours and they are great, but you do have to make sure the seal is good around your ears.
Join Date: Apr 2007
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Have had no such problem with Bose of any model including A20, but a similar problem with Zulu. The ANR as I understand it does somewhat depend a suitable seal between the earcup and head to operate properly.