Have a new set up of a denon AVR that has replaced an old (but good) stereo set up. All connected to networked pc. I use it almost exclusively for music. I have 4 speakers, two quad 11l for the front and two old mission m3 for the rear. I intend to get a small sub that can be hidden but a centre speaker will not be easy to fit in. I will have to build a shelf for the TV to sit on so the speaker can go underneath. Question is will I notice a massive difference? If yes should I spend more on a centre or just get something cheap as the quads and sub will do most of the work. Ideally I would like a matching quad centre in birds eye maple but have a strict budget of £75. I can get a centre for £50 from amazon delivered, (magnat!). What's the opinion.?