twoleftears2,407 posts05-20-2020 9:53am
Didn’t HSU make home subs from cylindrical cardboard concrete forms back in the day?
Sonotube, and a lot of us, poured the concrete, too. Concrete Tubes are dead silent. No problem, with vibration, just placement.. 18" vary from 60-100 lb a foot. Depends on wire size, the mix and thickness. Taller the tube deeper the tone. I used an underground vault on time.. Two PA drivers. It has had, 12,15,18" drivers. Settled on 15, last time I looked 1 block of BASS... 2-400 watts
"T" base bens too. The uprights were passives the crossbar was active.
Talk about boom boom, very easy to room tune also.. length or PR, true glass breakers..Very space hungry laying down..
OP is on to an oldie for sure, they been around for a while. I’ve seen a few, different designs, We called them 3x2. Three way, Two driver
Pipe organ design, Length x diameter.... for the blend....... ahhhh the blend
Can also stuff the tube and move the stuffing up and down for tuning.
Bull horn style is fun to.. Honk Honk.. Think Ampa...