I have an isight atop a 20in cinema display with the center channel of my logitech z680s mounted to the wall approx 1.5 feet from the isight. I set the speakers to stereo when i use the isight, but still get complaints of echos. I think the ideal setup would be smaller speakers mounted well below the isight (like apple pro, or JBl creature speakers). As soon as I get a TV, the logitechs are moving out and some smaller speakers are coming in. Hopefully with that setup I can chat without the use headphones.