Best Big Sub? or duals?

Adona spikes.

It would have been a good choice either way. The software on the DD18 is really tough to beat but the smaller powerful sub got my attention as well. Putting spikes on mine tightened things up some more too. I have carpet on wood floors. Have fun with them!

The G213 has a huge sweet spot as well as 2 F113's. For the money you may want to go with the two F113's. DD18's would be another great choice. I use the F113's because I felt they have great slam and extension with zero overhang. They look great and have a small foot print but play more like a bigger sub. Don't look at graphs, just go demo them if you can. Guys will try to steer you towards looking at graphs but in the end you either like what you hear or you don't. I have never bought a speaker based on a graph. I read reviews and posts and then try to find a place to hear them. The reviews are pretty much dead on with the F113. They are getting better as I put more hours on them too. The guy at HT shack shows a graph and it shows the F113 distorting at high spl's. Then in the forum he says the F113 is the best commercial sub he has heard. Go figure!

Hey Coach, my room is big. 18'w x 40'd x 10h and one on each side of the speaker is ideal. Adds great bloom, depth and stage. Nice controls which makes them very versatile and integrate nicely with time. They don't disappoint that's for sure.