Hey Din. To reply to your question...my last receiver I used connectors. With the H/K...I'm just using bare wire. Why? Because as has already been stated...it doesn't make any audible difference and I had money to save up for a subwoofer at the time rather than drop $$$ on connectors. At least that's my impression. So here I am. Proof that you can fit 12 gauge wire just fine into the 630. Albeit, it would be a lot easier to have connectors on the end so when your receiver comes in...pop, pop, pop, they're in and you're ready to get rolling. But fitting the bare wire in is not that difficult.
The only tricky thing you'll run into is the bi-wiring (if you so choose that option). I did and was able to stick both wires into each of my left and right channels. Bare wired - one up and one down (both sides of the binding post). When you get your receiver, you'll know what I'm talking about. And if you don't, feel free to send my a PM (personal message) and ask me to elaborate or translate
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