The Jurassic Lunch vids deserve their own too :-D
This is a bit OT, but those participating here are likely the only one's qualified to answer.
I am building an IB with a pair of three 18" driver arrays. (can't wait to get this done!)
How low do you guys EQ down into these very low frequencies? Is it still advantageous to EQ under 20Hz? Should I be going down to potentially 5Hz?