Got bored, did another video. Well, actually six videos but I put them all together. Apologies for the terrible quality - I just don't have a good camera.
Just a demonstration of what happens in this house when I put sine waves through the horns below the corner frequency. Started at 12Hz, ended at 15Hz. Though not loud enough to register on the SPL meter due to the highpass, 12Hz was already loud enough at the fundamental to get ductwork rattling - not sure if you can hear that in the video due to the quality.
15Hz is pretty much high enough in frequency that I can't turn it up loud enough to find the limits of the two horns. As it is, it was pretty violent. The couch was visibly shaking, the screen was flapping, the door to my bedroom was rattling hard, the light fixture on the ceiling was moving up and down by more than half an inch... it was nuts. This is why that fixture no longer has a shade on it. This is why I have to change that light bulb frequently. I actually had to pop my ears after this one ended.
Final part of the clip is the first music demo of the horns I've recorded... they were set 8dB over reference for this. Used a recording of the world's largest pipe organ... this track has strong content down to 8Hz. Blew a woofer in the mains near the end (already replaced with a spare). 121dB at listening position from the horns. The camera couldn't handle the SPL on some of those peaks... you can sort of hear it distorting in places despite the sucktastic sound quality.
Probably the last video I'll be making of these. I can't let them get any louder in a place I'm only renting, but they will do it if I ask them to.
Now, to go design me some new mains. I shouldn't have asked them to try and keep up with the two monsters