It is kinda hard to draw direct comparison of them when I have been using mine solely for surround duty. The single8 is a ridiculously capable speaker, and their rolloffs are pretty similar. Both will want about an 80hz XO. The single8 can take a lot more power, and thus go louder. The brief time I ran a pair of my build in stereo I was still floored at their capability when powered with my xpa-5. The single8 shouldn't be able to do what I heard it do at the g2g, but I feel like I got a good deal of the way there with this build, just not with the ability to run at absurd levels and as cleanly. Using these for mains is a good starting point, but eventually I would say I might ask for something a little more capable. For surrounds, they are a no-brainer to me. They hung right in with the JTR triple12's I had and I still have yet to hear any scream at me over too much material. That is even with the gun fight scene from Book of Eli and some of the other big surround scenes. They have always just chugged right along!