I learned recently putting cabinet s closer together make s them sound louder. Tried it and it works. What would happen if one were to combine several low wattage small subwoofer boxes? The new bose pa had me thinking, they just use 2 of the same subs for bigger system. I was wondering if I had 2-4 100 watt small sub boxes, would that be/seem louder than 1 400 watt big box ? I'm fixing to do some bookstore/coffee shop solo shows, I need a little 30-20hz support. Just a touch. I was even thinking of going to all the thrift stores/habitat and getting all the powered home theater subs, and wiring them together somehow in a big pile. Is there a book anyone can recommend with modern technology? I have a few from 60-80s and really they made me ask more questions than I got answers. Like those orange isobaric cabs, I don't care for them, but I like the idea. In the book I have isobaric is shown with speakers facing each other.