mixtwojacks is a completely passive device that does not require a power supply to operate. All you need to do is plug the two mini-jacks (from the signals you want to mix) into the inputs, and plug the headphones into the output socket.

mixtwojacks is specifically designed to combine two signals from the headphones outputs of a wide range of devices, including IEM receivers, walkie-talkies, audio recorders, mixers, smartphones, laptops, and more. We recommend using mixtwojacks only for its intended purpose and following the instructions in the user manual.

To use your walkie-talkie with mixtwojacks, you will need a PTT cable compatible with your model. To connect the IFB (or other signals coming from a headphones output), you will need a standard mini-jack TRS cable (included).

You can check the compatibility on our Radio Connector Chart or contact us at info@mixtwojacks.com

mixtwojacks is designed to be highly versatile and compatible with the vast majority of walkie-talkies. We offer PTT cables in three versions: Motorola M1, Kenwood K1, and Icom/Midland I3. With these three cables you can cover almost every model of 2-pin connector radio. For specific compatibility details, please refer to our Radio Connector Chart or contact us at info@mixtwojacks.com.

Our chart is continuously updated but may contain some inaccuracies. If you have any doubts about the compatibility of your model or need a custom cable for non-standard models, please email us at info@mixtwojacks.com.

You can use any headphones with a TRS mini-jack connector. If your headphones have a built-in microphone (TRRS mini-jack connector), we recommend using a splitter. Some TRRS connectors can cause issues with listening and device functionality. Note: headphones with high impedance and/or low sensitivity may experience a reduction in volume due to the resistors used in the mixtwojacks circuit.

If you have any doubts please email us at info@mixtwojacks.com

The trimmer on the side of mixtwojacks allows you to attenuate the M input (leaving the ST input unchanged). This can be useful for radios that have a very high output level, even when the potentiometer is fully down. To adjust it, simply rotate the trimmer using a small screwdriver.

Not at all. mixtwojacks operates with a passive summing circuit that does not alter the sound in any way; it only slightly attenuates it in order to not damage the connected devices and reduce crosstalk.

mixtwojacks is a stereo headphones combiner that operates with a passive summing circuit. The resistors in the circuit reduce crosstalk but do not eliminate it completely.

The chosen resistors value results in minimal attenuation of the input signals, with some slight crosstalk between the right and left channels of the headphone output. This means there is a slight reduction in stereophonic separation; for example, if a signal is panned hard left, you may still hear a bit of that signal in the right channel.

This is generally not an issue when connecting a dual mono source to the ST input, such as a standard IFB receiver. If you prefer minimal crosstalk with greater attenuation of the input signals, you can request a custom mixtwojacks model.

If you have any doubts please email us at info@mixtwojacks.com

The signal is attenuated by a few dB, depending on factors such as the impedance of the headphones used.

Yes, you can directly connect the PTT cable into an input (or a comm port) of your recorder/mixer instead. This allows you to listen to the walkie-talkie through your headphones and use the PTT microphone for communications.

If you prefer to use a PTT cable directly connected to your mixer/recorder with a connector other than mini-jack, such as XLR or TA3, you can request a customized version by contacting us at info@mixtwojacks.com

Yes, mixtwojacks is covered by a 2-year European legal warranty. If any issues arise, please contact your dealer or the manufacturer.

Please note that opening or modifying mixtwojacks will void the warranty. Check warranty conditions here.