A little history. My project started life as an A7-500 build. After having all the panels cut I decided to go BR using the same parts. I pondered using 2 speakers per box, I have a pair of 421-8H I could have played around with but decided to stick with a single 416-8B. Also, the cost of shipping 416s Altecs to Australia is horrendous. This project has cost more than anticipated so I am comfortable with my choice. 2x416s would have been great, though.