I'm not sure if this is applicable, but something I have noticed.
When my next door neighbors (several throughout the years) would play their small systems, it was quite audible in my space. However, I've played my system, which obviously has much greater bass extension and capacity, and yet didn't hear it next door.
So obviously something in those small speaker systems was hitting a resonant frequency which was exciting the wall, while my more spread out bass didn't. Perhaps these systems (seemed like powered speakers) uses the resonant frequency to make bass, and higher end systems with smaller woofers don't.
When my next door neighbors (several throughout the years) would play their small systems, it was quite audible in my space. However, I've played my system, which obviously has much greater bass extension and capacity, and yet didn't hear it next door.
So obviously something in those small speaker systems was hitting a resonant frequency which was exciting the wall, while my more spread out bass didn't. Perhaps these systems (seemed like powered speakers) uses the resonant frequency to make bass, and higher end systems with smaller woofers don't.