
It these aren't a factor, the focals paired with one or two quality 10" or 12" subs are the way to go. So if saving money or space is required, the earthquakes are a good solution. The focals paired with a dedicated sub would give you the best bass solution and could be run at higher frequencies to make up for the lack of the lower mods the 4"s can't or would strain to reproduce. The earthquakes alone are an economical and space saving way to get a little deeper bass than the focals alone. You'd need a real dedicated sub to produce the real lows, paired with the focal or similar to do the mid bass to do it correctly. Also, though the earthquake go deeper, not substantially. Unless you were using crossovers to split the bass signal, they would be replicating the same frequencies but differently and there would be conflicts between the sounds and it would be unbalanced. Why don't folks get one Earthquake and one Focal? Wouldn't that provide some mid and some low?
