Hi Billy. I thought about getting four hst's but the problem would have been amplification. I'm already having issues with mine and I'm not sure a 20 amp circuit could support the amp needed to power two of those things. Plus like you said.....overkill. My current setup is total overkill for my 3000 cubic feet space, but I guess that's the point. Lol. I'm in Orange County if you're ever in the neighborhood and want to stop by.