Originally Posted by jaybarbour
so which is better for movie use only.
A pair of MFW-15's will be able to provide greater clean output above 20 hz and provide a level of slam that the Castle can't muster.
The downside is that the MFW-15 is not tuned as low as the Castle and won't be able to produce the same output levels below 20 hz. I would imagine that dual MFW-15's won't be too far off a single Castle below 20 hz.
However if you value deep bass extension, the Castle will win. If you want accurate bass within the vast majority of program content and want the cleanest and most linear bass above this region (and loudest), dual MFW-15's will be superior.
The thing is, a movie does not simply contain 20 hz content and below. Just remember that if you decide to buy dual MFW-15's, you'll still be able to achieve very high levels below 20 hz but it just won't match the Castle in that respect.