I have an SWR SM 400S. I have been experimenting with high pass filters (or low cut filters) to clean/tighten up the low end. I'd like to be able to use the built in crossover. I would just set the crossover point really low and run the "high" output back into the power amp. The problem is, is that it only goes down to 100hz. I would need it to go to at least 40hz. Maybe even 30hz. Is a mod like this possible. Just want to throw this out there to people smarter than me. Thoughts?