32 foot organ pipe is 16.4Hz
The head displacement 'whhomph' on a kick drum is about ½Hz in a rock band.
Harp, contrabassoon, piano about 28Hz
Tuba about 30Hz
Large spaces have sub harmonics. Reproducing them transports one to the venue.
Sorry to hear about the 2x woofers. Multiple woofers are seldom done right and suffer badly due to panel interference and multiple asynchronous reflections. I’m guessing they are ported. Too bad. Much harder to integrate with subs.