I have a pair of Joseph Audio monitors (RM7si) as the front channels, and thinking about adding a center channel for HT. An attractive deal was offered on a Dynaudio Contour (T2.1), but I'm not sure how it will match up with my JA. (JA's impedance = 8ohm vs T2.1's = 6ohm nominal). Will this create any technical mismatch ? How about sonically ? Intuitively, the lower resistive load will be easier for an amp to drive - Is that right ? My amp is rated at 200w/ch with 8 ohm so I don't think this will be any problem.

Also, T2.1 is rear-ported. Will this have any problem with low frequency if it's placed in a tight cabinet (6" clearance in the back at best) ?

Thanks in advance for you inputs.