I bought my set at a shop in Germany as I'm living in Munich for the moment (Komplett in Germany had it for less than I paid, but I didn't feel to bad as I picked them up and I managed to negotiate discounted stands).
Terminals for the centre speaker are at the centre, on the bottom (the moulded stand provides the space for this and there is a gap at the back of the moulding for the wire to exit, the included wall mount has a matching hole to allow the wire out the bottom when mounted)
Interestingly the German Komplete site (
http://www.komplett.de/k/ki.aspx?sku=341281) is €449, which is cheaper than the English price (
http://www.komplett.co.uk/k/ki.aspx?sku=341281), which is £369 (which is about what I paid for them actually).
PM me if you want pics