I need this simple device, because i have two audio interfaces (one for guitar recording and one for vocal recording) and when i change audio interface i need to disconnect output cable, of first interface, from my monitors and then connect output cable from second interface to my monitors. So with this I can choose between two different stereo audio inputs and send one of them to output. I am using TRS connectors, but i will also need XLR version of this. Check out this picture:
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You could use just a switch for this purpose. If using a switch you have to be sure there is no DC offset between the audio inputs, otherwise you will hear a loud bang when the switch is operated. DC offset might occur if one of your audio sources has an electrolytic capacitor at the output. A high impedance resistor at each input of your switch will prevent these electrolytic capacitors to discharge and keep the DC offset low. Good shielding is important to reduce unwanted noise. Much more possibilities you will have with a simple audio mixer. Then you can mix the audio sources, fade the sound between sources and have tone and volume controls. Simple audio mixers are for sale from less than $50.
