That's interesting. The tech manuals and other searches have them both selling RetIl for 899.00 a pair in the early 90's. Same components, different box. Same speaker, minus a Kappa logo. Thats why I posted my question. Do the dual ports in the front with the Kappa 5.1 make dramatic differences over the single pot in the back with the CS 3006. I understand with the ports in the front. You can put them against the wall. With the rear port, you need two or more inches away from the wall.