OK, I ran the GR Research A/V-2s for about 3hrs last night (review coming next week), all by themselves, full range to get a feel for them and how hard the 4 Ohm load will push my Marantz 8300. It got quite warm, but not what I would consider "hot". It seemed warmer than it has gotten with my current speakers, which are 8 Ohm. This is just with two of these guys hooked up, and I will be running THREE of them as my front stage. Am I going overboard in considering this as a potential issue long term? Should I consider one mono for the center, or two for the mains to alleviate some load or just not worry about it so much? I have a few hundred $$ credit I can use at my dealer so I could almost get 2 MA6100s for the price of one, brand new. The 6100s are 4 Ohm capable.