3.5mm 4-Conductor (Female Jack) to 3.5mm 3-Conductor (Male Plug) Headset Adapter

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3.5mm 4-Conductor TRRS to 3.5mm 3-conductor TRS Adapter • Part No.: CRD-LRG

This adapter is very similar to our UNC-LRG, however this version has a short flexible cord between the jack and plug

Imagine taking your Bose Headphones or Earphones with you an an airplane flight and plugging them into the audio jack from the airline entertainment system, only to find out that you can hear sound from only one ear. Both channels are there, but due to the way your Headphone is wired, it won't allow you to hear both audio channels. This happens every day and their is a very simple solution. You can plug your Headphone into our UNC-LRG and the other end of the adapter plugs into the airline sound system jack. That's all there is to it. This audio adapter bypasses the microphone connection to your headset, and that's fine, because your not likely to be using your microphone at that time anyway.

  • This adapter will enable you to connect your headset or earphone or headset into a 3-conductor audio jack so you can hear both the Left and Right audio channels by temporarily eliminating the microphone and push-button connectivity.
  • In some cases, you can find that plugging your 4-conductor plug headphone or earphone into a 3-conductor jack produces no audio, and pulling out the plug slightly (or pressing on the push-button switch) suddenly enables you to hear the music. The problem is not a faulty jack, but a difference in how the 4-conductor plug makes contact inside the 3-conductor jack. Our UNC-LRG and CRD-LRG will resolve that issue. Click Here to understand why.
  • Our CRD-LRG adapter accepts your 4-conductor 3.5mm male plug from a CTIA configuration headset and enables it to mate with a standard 3.5mm 3-conductor stereo female audio jack
  • The TRRS (tip ring ring sleeve) on your headset or earphone could be wired according to the CTIA standard (commonly used by Apple wired headset earbuds) or it could be wired according to the OTMP configuration that was first adopted by Samsung to avoid patent infringement issues 
  • The male plug of our CRD-LRG adapter is a standard 3.5mm 3-conductor TRS stereo plug
  • The female jack end of the CRD-LRG adapter is a 4-conductor 3.5mm TRRS jack made to accept headphones and earphones that are CTIA (AHJ) configured audio plugs

CRD-LRG Cord-Large Audio Adapter

3.5mm 4-conductor (female jack) to 3.5mm 3-conductor (male plug) headset adapter • Part No.: CRD-LRG

  • The CRD-LRG adapter will enable headsets such as the Bose Quiet Comfort series headsets with a 4-conductor 3.5mm male plug to be adapted for use with the standard stereo 3.5mm TRS audio jacks to hear both channels of audio
  • The CRD-LRG adapter will enable a 4-conductor headset to hear the audio from a 3-conductor iPod MP3 player and other stereo audio devices
  • This adapter is made to work with iPhone compatible wired headsets with a 4-conductor TRRS plug that uses the CTIA wire standard. Below the connections of the plug are shown, and you can see the differences between the wiring of the CTIA and AHJ compared with the OTMP wired plugs.

CRD-LRG Audio Adapter

Part Number CRD-LRG TRRS-to-TRS Adapter is Wired According to the CTIA and AHJ (American Headset Jack) standard

As indicated above, there are two different headset wiring standards and although most of the newer earphones and headphones are CTIA (AHJ) compatible you may find some OTMP compatible headsets are still in use. Some older Samsung headsets were wired using the older OTMP standard. The CTIA standard was popularized by Apple when they came out with their wired headset earphones. All of our earphones with a built-in microphone and push-button switch that have a TRRS 4-conductor plug are CTIA compatible. Nokia and many of the Samsung devices tried to avoid infringement issues, so they intentionally wired their earphones differently, and that resulted in the less popular OTMP wired earphone configuration. Eventually Samsung settled their infringement lawsuit with Apple, and afterwards Samsung began to adopt the CTIA / AHJ audio standard, and their newer earphones and headphones were wired with the same CTIA / AHJ that Apple had used for many years.

The following device headsets are CTIA and AHJ compatible, so they will work with our CRD-LRG and UNC-LRG adapters: Android cellular phones, Motorola Droid, Samsung Galaxy 5, Blackberry, HTC, Thunderbolt, Google Nexus, Google Pixel, Galaxy Tab, Sony Xperia, Toshiba Excite, Lenovo Thinkpad, LG G Pad, Nvidia Shield, Acer Switch, Asus MeMo, Kindle Fire, Kindle Touch, iPad Air 2, iPad Mini, Lenovo, Dell, Microsoft Surface, HP Slatebook, Razer Edge and Lenovo IdeaTabwere. All of these devices use the sleeve of the 4-conductor plug to connect the microphone and push-button switch. This sleeve connection is eleminated inside the female jack of this adapter.

Below you will find the technical details for those who want to understand the wiring differences between OTMP and the more popular CTIA configuration used with 4 conductor TRRS audio plugs:

The table below shows the normal wiring for OTMP and AHJ headphones in relationship to the adapted plug for our CRD-LRG adapter.

Female Jack
Tip Left Audio Left Audio Tip
Ring 1 Right Audio Right Audio Ring 1
Ring 2 Mic/Push-Button Ground Ring 2
Sleeve Ground Mic/Push-Button Not Connected

As shown in the above table, our CRD-LRG adapter eliminates the connection from the sleeve of the 4-conductor female jack. The CRD-LRG adapter will not pass the connection from the sleeve to any of the 3-conductors of the male 3.5mm 3-conductor plug. Those headsets wired with the CTIA and AHJ standard will find that the  microphone and push-button switch connections will not be used. Any headsets wired to the OTMP standard may not function correctly, because the CRD-LRG adpater does not connect the sleeve connection containing the common ground wiring for those headsets. If you have a headphone or earphone that is compatible with an older Samsung cellular phone (prior to the Galaxy 5 version) or a Nokia phone, the CRD-LRG adapter may not work with your headphone.

Please see the schematic drawing above for a better understanding of the CRD-LRG internal connections and how they are routed to the pins of the 3-conductor male plug. 

If you have ever wondered why your TRRS (4-Conductor) Plug type of headphone or earphone does not work when you plug it into a standard 3-conductor 3.5mm stereo audio jack, click on the link below to view a schematic that illustrates why that happens.

CLICK HERE to view/download more information on what happens when using a 4-conductor plug in a 3-conductor jack.

CLICK HERE to view/download more information on why pressing on the push-button switch might cause the sound to work. Also described is why the sound may work if you pull the plug out slightly.

This Headset Adapter is a 3.5mm 4-Pin Female TRRS to 3-Pin Male TRS Plug very similar to the UNC-LRG, however  the CRD-LRG has a flexible cord betweent the plug and jack and the UNC-LRG is a one-piece adapter.

Imagine that you are plugging in your headset into your stereo system, and find that you have to jocky the plug so it does not go fully into the jack in order to get the sound to come out of your earphones properly. The problem is that you may be trying to plug your 4-conductor headset into a 3-conductor jack.

Another problem some run into: You plug your headset into the audio jack and find that the sound only works correctly if you press the push-button on your headset. Most likey in this situation, the jack contact inside is making contact with the 4th conductor sleeve instead of the 3rd conductor ground. This CRD-LRG adapter should resolve those issues Click Here to download document that describes "Why You Must Press on the Headset Button for Audio".

Most stereo devices, including an iPod, MP3 Players, Disc Players, Stereo Radios, etc. have a 3.5mm female jack that is made to accept a 3-conductor plug (with two black rings). Note: The 3.5mm plug is a standard size sub-miniature audio plug that is the same as 1/8-inch in size. This type of plug is known in the audio industry as TRS for "Tip Ring Sleeve". The tip is hot and carries one channel of the stereo audio. The Ring refers to the middle section of the plug and that carries the other channel of the stereo audio. The Sleeve is the ground return needed to complete the audio circuit.

Most headsets have a built-in microphone and pushbutton switch, so they need an extra connection on the plug. The 4-conductor plug of a headset is referred to as TRRS for "Tip Ring Ring Sleeve". In order to mate your TRRS headset (with its 4-conductor plug) to a TRS jack stereo device, you need our TRRS to TRS adapter. Without this adapter, you will find that you can use the earpiece, but you have to keep the plug from entering into the jack all the way. By holding it so that it is just slightly out of the jack, you are helping the TRRS connections to mate properly with the internal jack parts so that you can hear the sound from your stereo device.

We sell the adapter that will enable you to use your favorite headset earphone with nearly all stereo audio devices, by converting the 4 conductor TRRS 3.5mm plug to a 3 conductor TRS plug that is standard to most stereo devices. This adapter is a short cord with a 4-conductor female jack on one end, and a 3.5mm 3-conductor stereo plug on the other end. Just plug your headset into the adapter, and then plug the adapter into your stereo equipment. The microphone and push-button switch will not do anything, but you will hear the music properly with the plug pushed all the way into the jack.

Jack Type
3.5mm 4-Cond
Plug Type
3.5mm 3-Cond Stereo
Plug Plating
Plug Style
Male Plug Configuration
4-Conductor TRRS CTIA / AHJ Standard

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