Janina, Yes, I’ll bet that different manufacturers use these contacts differently.
An Apple or other brand plug can have a tip, two rings, and the sleeve to make 4 contacts, and even if the ground is wired to the sleeve, the intended jack might have a larger sleeve contact that shorts out the next ring. And the. wiring of the tip and two rings can be switched around, to make things more confusing. So definitely important that the intended jack be used with the intended plug. Not as standardized as with 1/4-inch plugs and jacks used in audio components. Dave Carlson Oregonian, Farfar, Engineer, Musician, Pioneer, and Woodworker > On Nov 18, 2020, at 1:29 AM, Janina Sajka <jan...@rednote.net> wrote: > > Hi, Dave: > > Yes, it does have to do with TRS terminations. Why is, of course, a > business/philosophical question I can't answer. How is also something I > can't describe off the top of my head, but I did find this web link: > > https://www.reddit.com/r/headphones/comments/4bxjn8/whats_the_deal_with_ios_vs_android_inline_controls/ > > And yet more detailed info here, including some history of how we got > here in these links: > > https://www.headphonesty.com/2019/04/headphone-jacks-plugs-explained/ > > https://www.provideocoalition.com/ts-trs-trrs-trrrs-combating-the-misconnection-epidemic/ > > And here possibly an even more clearly articulated explanation: > > http://wiki.robotz.com/index.php/TRRS_Phono_Plug > > > This last article notes the existence of plugs that will remedy the > problem our friend has experienced, i.e. swap the terminations--but one > would need to find the appropriate converter plug. > > Personal note on this -- I first ran into this issue over a decade ago > when I bought a Bose Quiet Comfort 3 noise cancelling headset. Many is > the flight I took with those Bose playing no music, simply cancelling > much of the jet engine noise while I tried to sleep. > > The Quiet Comfort came with two cables. One was for use with Apple > devices, the other for use with PCs and Android. This is where I became > experientially aware of the discrepancies. > > hth > > Janina > > > Dave Carlson writes: >> Janina >> >> Do you have any way to describe specifically why there are differences in >> Apple’s implementation of the headphone jacks versus Windows and others? I >> am guessing it’s in the electrical connection to the T-R-S contacts on the >> jacks and plugs, correct? >> In other words, why are they different? >> >> Dave Carlson >> Woodworker, Oregonian, Pioneer, Musician, Engineer, and Farfar >> >>> On Nov 16, 2020, at 11:28 PM, 'Janina Sajka' via MacVisionaries >>> <macvisionaries@googlegroups.com> wrote: >>> >>> Janina >> >> -- >> The following information is important for all members of the Mac >> Visionaries list. >> >> If you have any questions or concerns about the running of this list, or if >> you feel that a member's post is inappropriate, please contact the owners or >> moderators directly rather than posting on the list itself. >> >> Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: >> mk...@ucla.edu and your owner is Cara Quinn - you can reach Cara at >> caraqu...@caraquinn.com >> >> The archives for this list can be searched at: >> http://www.mail-archive.com/macvisionaries@googlegroups.com/ >> --- >> You received this message because you are subscribed to the Google Groups >> "MacVisionaries" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to macvisionaries+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/macvisionaries/B93D65AC-25ED-40C3-B3B6-E39F17F2C479%40gmail.com. > > -- > > Janina Sajka > https://linkedin.com/in/jsajka > > Linux Foundation Fellow > Executive Chair, Accessibility Workgroup: http://a11y.org > > The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI) > Co-Chair, Accessible Platform Architectures http://www.w3.org/wai/apa > -- The following information is important for all members of the Mac Visionaries list. If you have any questions or concerns about the running of this list, or if you feel that a member's post is inappropriate, please contact the owners or moderators directly rather than posting on the list itself. Your Mac Visionaries list moderator is Mark Taylor. You can reach mark at: mk...@ucla.edu and your owner is Cara Quinn - you can reach Cara at caraqu...@caraquinn.com The archives for this list can be searched at: http://www.mail-archive.com/macvisionaries@googlegroups.com/ --- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/macvisionaries/D0ADA88B-0930-47CA-86B9-887A7F7A3A60%40gmail.com.
