C-Media USB adapter Mac Instructions
Suitable for use with Apple Mac OS9 and higher and any Apple Mac with USB input.
Note: simultaneous use with Griffin iMic etc. may cause conflicts that make applications "freeze" so please do not connect Lindy USB headphone adapter while another similar USB audio device is connected.
If you already have a Griffin iMic or similar audio adapter, disconnect it and reboot your Apple Mac computer.
Plug your headset or audio input device 3.5 mm jack plugs into the C-Media USB adapter, ensuring that the input and output connections are correct. Push the plugs fully in. Connect the C-Media USB adapter to a USB port on your Apple Mac, or to a suitable USB hub, which is connected to your Apple Mac.
Open your Apple "System Preferences" pane and click on "Sound".
Set the Input and Output devices to "C-Media USB Headphone Set". Close the Preference pane.
If you wish to use the device with Skype: open Skype Preferences, click on "Audio" and set Audio output and Audio input to "C-Media USB Headphone Set". Set "Ringing" to your desired audio output. Close the Preference pane.
Use the "Skype Test Call" facility to check headphone and microphone operation.
If your voice is faint or if it is too loud, or distorted, or if the volume varies a lot while you are speaking, go back to "System Preferences" and set the Input Volume to a more suitable level. If there is no voice at all, check that the correct input device is selected and check that the microphone plug is pushed fully into the C-Media USB adapter port labelled with the microphone symbol.
The C-Media USB adapter can be used with any suitable analogue audio input/output source, such as a tape player, CD player.
The one catch with this USB dongle is that you can't use a regular 1/8" (3.5 mm) mono microphone plug; you have to have a stereo microphone plug. Just the plug; it's only a mono input on the USB dongle. This means that your microphone has to have three connectors on it, such that it looks like a regular stereo headphone connector. Some computer headsets are already wired like that, such as the Plantronics Audio 310 Multimedia Headset . If you want to use your existing mono microphone, it's as simple as getting a mono-to-stereo adapter; mono (ground/tip 2 conductor) on the microphone side, stereo (ground/ring/tip 3 conductor) on the USB dongle side. It's OK to connect both ring and tip on the USB dongle side to the tip of the microphone. tip is not actually required, but for simplicity and reusability, you should.
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