I’m looking forward to heading to Iowa this year - it’s been a couple of years. Anyway, looking around I’m playing with the idea of making a few changes on a build I currently have, but I’ll want to convert the woofer-mid filters from active to passive (to make things lots easier at the event). Playing around from scratch and revisiting multiple filters (initially using active and actual measurements) I’m finding a 3rd order low-pass combo with a 1st order high pass works well with the drivers (target 380Hz). It’s a 4ohm woofer so I’m looking at what I’ve been missing with passive filters on woofers - yikers.
Thinking NP electrolytics for the shunt capacitor on the woofers- never used one but its looking like an attractive option.