I'm thinking of using a Wharfedale Moviestar 60+ centre speaker as a rear centre speaker which I can get for £24.95. I have a Marantz SR4300 that, according to the label on the back of the amp, is recommending speakers of 6 Ohms. The Moviestar is 4 Ohms. Would this be OK and can anyone tell me if this speaker is a good speaker to use, sound wise? It's going between a pair of Mordaunt Short MS 823R speakers. I'm on a budget as I've just bought a new DVD player and a new amp!