Albums mixed with Qsound might be an idea. I'm not sure you'll actually like the so-called 3D effect it's suppose to produce, but I think these recordings might be useful in your demonstration. You can check out some demos on the website.

M60s
VP150
QS8s
Marantz SR6003
Samsung LN52B550
Oppo DV-980H
Insignia NS-WBRDVD