Reading some of the posts in this forum, I understand there is a certain 'purity' in the design of OB speakers. Now I am wondering if you'd consider the Jamo R 909 speakers as OB.
http://www.jamo.com/Default.aspx?ID=635 ... ctID=17862
I also sometimes listen to a pair of Lowther DX3s mounted on Oris 200 Horns without the felt back (no rear cover). Does that count as OB?