When you purchase fe166e drivers they come with a cabinet design .I have owned V pipes with fe166e and the nagaoka fostex back horn sounds better balanced than V pipe,I also use fe166es-r cobalt mag .And the design it comes with looks better yet .Iam build 2 pair with fe166es-r, will compare to nagaokas fe166e design.My 17 yearold just built a pair in woods class.And I have my owned pair.Sorry no pics but heres some of my older work