Can u assist please? Need to replace speakers & connect the system to inceiling from Tannoy CSV4 Micro speakers. The 5 speakers connect by cable to the DVD end where there are colour coded plugs, but in line on each is a little black ovular device. What does this do? If I connected the new Tannoy speakers with new cable to the DVD socket is this sufficient or am I needing to replace in line the ovular devices? Thanks Duncan Round duncan.round@the-rounds.co.uk