It looks like your soundbar is a "passive" soundbar, which basically means it's just a speaker or array of speakers. Most soundbars today are "active" soundbars, meaning that they have a built-in amp. Because yours does not have it's own amp built-in, it needs power from your receiver. Unfortunately, this means you'll need to replace your receiver if you want to use the soundbar, as the soundbar cannot "stand on it's own."
Sony MASTER Series | harman/kardon AVR | Klipsch Reference Premiere | KEF UniQ | PlayStation | Mohu Leaf | Hue Play | MediaLight | logitech Harmony | CyberPower PFC UPS