I only sell Impedance matching VC's, and also use sps or hps 6's in this type of set up. The VC's are under used as I leave them at the standard settings, and let the speaker selector do the work. In my mind its worth the extra 10/VC for the flexibility, and protection if complications arise.

I have hooked up may 'zone 2's' this way, but always recommend a dedicated amp for this purpose, and tell customers that want to pass on the dedicated amp for the time being that even though it works now, we may need to add the amp down the road. Adding the amp has happend about 50% of the time within a 2yr window. I would also recommend using a custom amplifer like niles or russound that can handle more challenging loads just to be safe, rather then the $50 Ebay special.