Steve, This may or may not be helpful. But it is interesting. And the pocket really is an older piece of equipment. This user was concerned about the vocaster but the description of the two different wiring standards is still useful. Frank I determined immediately that I would require AI to answer this question, as I had no idea whatsoever what these stood for. I know TRRS is tip ring ring sleeve, but that’s it. This was my prompt to Deep Seek. I bought a Vocaster 2, and learnt just now that there are two types of trrs connections: OMTP and CTIA. Which type of TRRS jack does the Vocaster have? How about the iphone? Do I need an OTMP or CTIA cable, and adapter? And what do these acronyms stand for? Great questions! Let's break this down to understand which TRRS standard your **Vocaster 2** and **iPhone** use, and whether you need an adapter. ### **1. TRRS Standards: OMTP vs. CTIA** TRRS (Tip-Ring-Ring-Sleeve) is the 4-pole connector used in 3.5mm audio jacks for headsets with a microphone. The two main standards differ in how the **mic and ground pins** are arranged: - **CTIA (AHJ, American Headset Jack)** - **Pinout (Tip to Sleeve):** - **Tip (T)** - Left Audio - **Ring 1 (R1)** - Right Audio - **Ring 2 (R2)** - Ground - **Sleeve (S)** - Microphone - **Used by:** Apple (iPhone), most Android phones, Vocaster, and modern devices. - **OMTP (Open Mobile Terminal Platform, older standard)** - **Pinout (Tip to Sleeve):** - **Tip (T)** - Left Audio - **Ring 1 (R1)** - Right Audio - **Ring 2 (R2)** - Microphone - **Sleeve (S)** - Ground - **Used by:** Older Nokia, Sony Ericsson, and some budget devices. ### **2. Which Standard Does Each Device Use?** - **Vocaster 2** → **CTIA** (standard for most modern audio interfaces). - **iPhone** → **CTIA** (Apple helped popularize this standard). ### **3. Do You Need an Adapter?** - If you're connecting an **iPhone headset (CTIA)** to the **Vocaster 2 (CTIA)**, **no adapter is needed**-they are compatible. - If you somehow have an **OMTP headset**, you’d need an **OMTP-to-CTIA adapter** (swaps mic and ground). ### **4. Recommendations for Connecting iPhone to Vocaster 2** - If using a **TRRS cable (for headset mics)**, ensure it’s **CTIA**. - For best results, use a **TRS (audio-only) cable** if you don’t need the mic input from the iPhone. - If using a **TRRS-to-dual-TRS splitter**, confirm it’s CTIA-compatible. ### **Conclusion** - Both **Vocaster 2 and iPhone use CTIA**, so no special adapter is needed if using standard CTIA cables. - Only worry about OMTP if using older headsets (unlikely with modern gear). ----- -----Original Message----- From: Steve Richards [mailto:stephenrichards1951@tiscali.co.uk] Sent: Saturday, December 27, 2025 10:13 AM To: Plextalk Subject: [Plextalk] Fw: playing the Plextalk POCKET through the car speaker system ----- Original Message -----

Hi,

I am very keen to play my Plextalk POCKET through the speaker system in our car. There are two USB connections, each of which offer and external audio-in facility but, frustratingly, the Plextalk simply isn't recognised. I am using the 3.5nn jack in the Plextalk's earphone socket and a USB connection at the other end. The connecting lead is inexpensive but I do not wish to invest in something costly if it isn't going to work anyway.

Your comment and advice would be much appreciated.

Thank you

Steve

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