Most modern televisions have an optical (also called toslink) audio out port as well as the hdmi ports. The receiver would also have to be fairly old to have no optical-in connection. But if not, you can purchase a little digital to analog converter on Amazon that will go between the optical out on your television to the rca on your receiver. So, in other words, do not use the hdmi but the optical audio out, to the converter, to your receiver. Hope this helps! Indeed, you want to keep that great Acoustimass system going.