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

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

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  • Buy 10 for $12.95 each and save 14%

Quick Overview

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

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

  • Adapts your 4-conductor 3.5mm male plug headset to correctly mate with a standard 3.5mm 3-conductor stereo female audio jack
  • The TRRS (tip ring ring sleeve) female jack is wired according to the CTIA standard, commonly used by Apple wired heaset earbuds
  • The male plug of this adapter is a standard 3.5mm 3-conductor TRS stereo plug
  • The female jack end of this adapter is a 4-conductor 3.5mm TRRS jack


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

  • Adapter has a 3-conductor male TRS 3.5mm male plug on one end and a 4-conductor TRRS 3.5mm female jack on the other end
  • Enables headsets such as the Bose Quiet Comfort 4-conductor 3.5mm male plug headsets to be adapted for use with 3.5mm TRS airplane seat stereo jacks so you can correctly hear both channels of audio
  • Enables 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

Part Number CRD-LRG TRRS-to-TRS adapter is wired according to the CTIA and AHJ (American Headset Jack) standard
There are two different headset wiring standards so it is important to know whether your earphone headset is CTIA (AHJ) compatible or OTMP compatible. Our TRRS-to-TRS 4-conductor-to-3-conductor adapter is configured to work with the CTIA compatible headsets. Apple wired their headsets according to the CTIA standard, (also referred to as the AHJ, American Headset Jack standard). Nokia and many of the Samsung devices prior to the Samsung Galaxy 5 were wired according to the OTMP standard.

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 greater insight into how this adapter is wired:

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 an older Samsung cellular phone (prior to the Galaxy 5 version) or a Nokia phone, the CRD-LRG adapter may not work for you.

Please see the file titled "TRRS-to-TRS Cable Connections" at the bottom of this web page. This drawing contains a graphic view of the CRD-LRG internal connections and how they are routed to the pins of the 3-conductor male plug.

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 iPhone 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 See downloadable file at the bottom of this web page titled "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.

Additional Information

Additional Information

Plug Type 3.5mm 3-Cond Stereo
Jack Type 3.5mm 4-Cond
Plug Plating Nickel
Plug style Straight
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