Vogels| EFA6840 Column System. The Vogels EFA6840 column system is designed to fit up to four EFA6825 Audio and DVD wish bone support shelves. The column system is an ideal and easy way to hide and guide unsightly cables and wires at any height. Combining the Vogels column system with any Vogels DVD and Audio storage supports is the perfect way to store all your AV components in one single sleek looking solution. The column system features a flexible and unique AdvanCIS(TM) system giving you the freedom to easily hide any cables.