I've read in many different threads and articles, it is recommended to go with 80Hz as the crossover and call it a day. Two of the articles you tagged combat this, and instead say to use the full capable range of your towers. My B&W towers have an advertised range of 38HZ - 22kHz, so in your opinion would it be best to use a crossover of 40Hz to use the full capability of the tower, or leave it at 80Hz and let the sub carry most of the load?