Leaderboard

Technically, every enclosure becomes a "bandpass" application when loaded into a vehicle, as you have another air chamber acting on the front of the driver, and if vented, it's also acting on the vent. In the case of the blowthrough, the blowthrough itself, if not large enough, needs to be treat as a vent. You either need measurement equipment, or trial and error to find what will work "best."

A dry fit... a lttle bracing!.... All glued up and clamped!!

Wakeboard and ski boat controllers/headunits regularly have a kid input so you can bark directions at whomever is behind the boat. That would be the easiest method IMO.

A normal CB / PA radio like a Connex or Cobra has a audio output for external amplifier / speaker output. Should be an easy setup.

There is a big explosion of 4th orders and 6th orders as of late. Much of it is coming from cone area needs and the goal of having a hard peak in a small window (or bandpass). Many of these guys are doing it for demos. Some though are doing mega numbers as they are reaching different levels we did when we were doing this 20 years ago. With many magnitudes more motor force and 10x the power with ease, they are pushing limits I wasn't close to reaching. So a few guys I know are doing it also for a physical loading wall to help mechanical handling as thermal capacity of subs today are worlds greater than what they used to be. We had a guy out of Illinois/Florida, do a 6th order with 6 Zcon 15's. I was very impressed by the range of the enclosure. Yes, it was over 157db I think when full tilt, but the sound and smoothness in transition was better than the 4th orders at that same show.