Call IAG America and ask for a local dealer.
rick.m650: Don't bother biwiring anything. It just gives you the equivalent of 3AWG lower gauge. Additionally, it can induce some phasing problems between the treble and bass. I tried biwire for a while (2 x 16AWG Monster = 13 AWG), then yanked it out and single wired with 10AWG OFC copper, with much improved results.
FYI, I have EVO30, EVO center and EVO8 rears. Powercube DX12+ sub, but got it for a steal, and it is the best of the Powercube series. I think they're superb, and chose this setup over B&W 6 and 7 series, Tannoy, Def Tech and Paradigm.
I do agree that the center is weaker than the fronts. However, it's not glaringly bad or anything. The EVO center IMO is rather good for a center. Now Opus, well, that's transcendent! When I get the cash...