from my experience (and a lot of others on TB) with the 410HLF, the "low end" is not the problem. It puts out really deep frequencies and a lot of output in the that area. It is very muddy in comparison to other makes. What it lacks is lowish mids and punch altogether. My advice -which i can't comment on F#, or even B

- is that you look into another 4ohm SEALED 4X10