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Topic: Bose QuietComfort 15 and 25 TRRS connector (Read 9002 times) previous topic - next topic
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Bose QuietComfort 15 and 25 TRRS connector

Hey everyone,

I just got a QuietComfort 25 and would like to get a very short 2.5mm TRRS male to 3.5mm TRRS male cable or adapter in order to get it to do Bluetooth with a Sony SBH20. Like I implied above, the detachable cable of these headphones have a 2.5mm TRRS connector on the headphone's end, and a 3.5mm TRRS on the other, with an inline mic/remote in between.

What I'm wondering is why is the TRRS necessary on the headphone's end? Shouldn't it just be TRS stereo? I'd like to know if just a cheap short cable/adapter would work without issue.

BTW, it's not for the external mics for the noise cancellation. The headphones work for noise cancellation only (no music) even with the cable detached, and those mics are on the cups.

Bose QuietComfort 15 and 25 TRRS connector

Reply #2 –
Have you tried simply using a TRS male-male cable?

You can also find 4-pin TRRS female to 2x 3-pin male TRS adapters in electronic stores.
"I hear it when I see it."

Bose QuietComfort 15 and 25 TRRS connector

Reply #3 –
Quote from: ktf on
The manual says it is to control your iDevice or other compatible smartphone.

https://www.bose.nl/NL/nl/Images/owners-gui...tcm55-92808.pdf

I understand why it's TRRS for the device end of the cable, but I was talking about the headphone end of the cable. The inline mic and controls are in the cable. As far as I can tell only stereo audio should be going into the headphones. This is the cable, for reference: .

Quote from: xnor on
Have you tried simply using a TRS male-male cable?

I don't have those cables at hand, so I wanna know why TRRS is used at the headphone end before I test blindly.

Quote
You can also find 4-pin TRRS female to 2x 3-pin male TRS adapters in electronic stores.

I don't think that would work for my purposes, but in any case, I would like to buy one with 2.5mm male and 3.5mm male ends.

Bose QuietComfort 15 and 25 TRRS connector

Reply #4 –
Why? Those TRRS to 2xTRS adapters give you a normal headphone jack and a microphone jack, which you don't need to plug in.
TRRS is just Left, Right, Ground, Mic or the last 2 reversed. Mic to ground resistance is also used to send control signals (volume up, down ...).

I'm not sure if there are 2.5mm male TRRS to 2x 3.5mm male TRS cables available, but if you google 2.5mm trrs adapter/cable you will find a couple of products.
"I hear it when I see it."

Bose QuietComfort 15 and 25 TRRS connector

Reply #5 –
For a couple of reasons. One is that I'd like the simplest, smallest adapter, cause the whole purpose is to make the headphones wireless and less obtrusive. The other is that I still don't know for sure what the extra ring does at the headphone end. Might be something proprietary that I can't think of?

Bose QuietComfort 15 and 25 TRRS connector

Reply #6 –
Quote from: andy o on
I understand why it's TRRS for the device end of the cable, but I was talking about the headphone end of the cable..

Ah, misunderstood that, sorry. I really can't think of another reason either. Maybe to provide power to the remote or something?

Maybe you can just check whether it is wired to the other end? If that's the case (and the extra ring is indeed connected to the extra ring on the other side) you can be sure using a TRS at the headphone side is okay, because otherwise it wouldn't work properly with regular TRS sockets.
Music: sounds arranged such that they construct feelings.

Bose QuietComfort 15 and 25 TRRS connector

Reply #7 –
Quote from: ktf on
Quote from: andy o on
I understand why it's TRRS for the device end of the cable, but I was talking about the headphone end of the cable..

Ah, misunderstood that, sorry. I really can't think of another reason either. Maybe to provide power to the remote or something?

I don't think so, the mic and control appear to be standard for iOS devices, the remote works by shorting signals I think.

Quote
Maybe you can just check whether it is wired to the other end? If that's the case (and the extra ring is indeed connected to the extra ring on the other side) you can be sure using a TRS at the headphone side is okay, because otherwise it wouldn't work properly with regular TRS sockets.

That seems like an option, but couldn't passing current through the cable for testing damage the inline mic though?