That is perhaps the best five channel amplifier around. However, its limited to a sub and four highpass/fullrange speakers (and not six) because the four highpass channels are biased specifically for 4-ohms only. A lower impedance will result in a power reduction. A great alternative if you're running more than four coaxials, would be the JL Audio XD600/1 & XD600/6 combination. The collective footprint of the XD amplifiers is tiny.