Could the bass response be better or as good as my 1950's vintage 15" coaxial drivers loaded in bass-reflex cabinets? Except for Altec horns and high frequency drivers, my goal is to move away from vintage drivers and gain the toughness and reliability of modern pro drivers.

If I would like to build the Theatre 4's with my own drivers, do I need to buy the plans? Can I get just the plans?

Could I use a simple 1st or second order crossover around 800-1k hz to combine the Pi Theatre 4 with Altec horns? Does the woofer and box alignment depend on the crossover? I looked for answers to these questions in the forums but did find answers I could understand clearly.

Thanks