Apartment dwellers will testify that "bass notes" are more distinctly heard from music played in nearby apartments VS frequencies farther up the spectrum.
Why is this?
Well, the natural frequency of large walls, floors, and ceilings is lower than the natural frequency of smaller surfaces.
Okay, so the logic seems on, but I don't quite understand. Just exactly what frequencies are we talking about.
Assume you have two rooms divided by a wall. In one room, a test sweep (20khz TO 10hz) is being played at a constant volume (db). You are standing in the other room. Assume when the test sweep starts, the volume is too low to be audible. As the test sweep plays, the frequency lowers, & at point X, there should be an audible noise.
Well, what frequency is "point X?"
But 05LGT, there is no "set frequency" as all objects vibrate at a different frequency. But wait, wouldn't that be called the "natural frequency?"
Okay, well how do we figure the "natural frequency" of an object.
Wouldn't that be kind of impossible? I mean nothing can vibrate on itself. The wall sure can't. The speaker would be causing the wall to vibrate. So, in order to calculate the "natural frequency" of an object, one must take into consideration the "thing" that is causing the object to vibrate?
Is there a function on how to calculate this?
Theoretically, the speaker should be able to vibrate the wall at any frequency the speaker is putting out, correct?
But, we just said that the natural frequency of large walls, floors, and ceilings is lower than the natural frequency of smaller surfaces. What are these smaller surfaces?
Sure, sound waves travel just fine through walls. Okay, so why do subwoofers sound so much better in the cabin of a vehicle vs in the trunk. I'm not pointing out any exact make/model of a vehicle. It's just a given.
What happens to these frequencies? Do they get interrupted? Distorted?
I plan on firing a subwoofer through the rear deck of my 4 dr sedan & sealing it off underneath. I want to keep as much sound as possible inside the cabin, therefore wouldn't it make sense to seal off the trunk of the vehicle to keep all "sub bass" frequencies inside the cabin? Is this possible? Or is it only possible down to "X frequency?"