http://www.audiovisualonline.co.uk/dynamic/eshop_products.set/ref/1458/fisual-subwoofer-cable-10m-pro-install-series/display.html
or
http://www.audiovisualonline.co.uk/dynamic/eshop_products.set/ref/43/profigold-pga4109-10m-subwoofer-cable/display.html
or
http://www.audiovisualonline.co.uk/dynamic/eshop_products.set/ref/1114/qed-qunex-p-sw-10m-subwoofer-interconnect/display.html