Something like this ( ) is going to give you all the inputs (just adapt the 1/4in to 1/8in) you'll ever need while it's basic and cheap is overkill in this situation.Įlectrically yes, this does combine the line-level inputs, but as mentioned this could result in input voltage being higher than expected and 'frying' your input.

) you can then just configure your secondary Mic input to pass through to your speakers (You can do this in windows). Your 'Line In' and 'Mic' ports effectively perform the same function, with the added benefit that you can easily configure the Line In to be a passthrough leveraging your PC as an audio receiver of sorts.Ī Mixer would work, but you can avoid needing one by the above or purchasing a simple USB sound card (Here's one for $1.18, and it ships free. I'll bet you have all the cables do do this laying around already.This.

Then the PC is the main feed of your speakers and the other device feeds to your PC as a line in device and still hits the speakers. There is a simple alternative, just plug the echo into the line in/mic port on your PC and make sure it's set to listen in the config.