As the title really. I want to use my old Technics hifi as a set of speakers for the TV and Sky Q box to save my buying a soundbar. No audio output on the TV, just HDMI and Scart connections. The current lead to the old hifi is a pair of RCA plugs. No optical input on the hifi. Is it just a case of buying a Scart to RCA or HDMI to RCA adaptor cable?