Exactly. This is demonstrated by the fact that many home audio subs face downward, and can pretty much be placed anywhere in the room ( corners are recommended), yet you don't percieve the sound as coming from any particular direction.poisonfist said:Any soundwave below 80Hz is unidirectional, it has more to do with the proximity to the surrounding surface rather than the direction of the drivers (it's called the "proximity effect").
Cancellation only happens with out-of-phase sounds. For that to happen, you need 1/2 the distance of the soundwave to it's proximity wall for it to cancel each other. Another thing is that you need a solid wall that is flat and parallel to the driver, the environment in the trunk prevents this from happening. Rather, in some cases, I would be more worried of the standing waves occuring within the trunk thus amplifying certain frequencies and preventing a nice smooth flat response.unleaded said:i am telling you guys, it is all about cancellation of waves
Ding Ding Ding...the period of a low end frequency is longer, a lot longer the say 5K.....so it nneds to travel away a bit them the way bounces back and it has the distance to hit you and not over shoot youeatmocake said:i think someone said somthing about certain frequencies not coming out clear for the first ten feet or so before it reaches your ear, so that gives it time to hit the back of the trunk and turn around
You mean wavelength right? Sound travels @ 1,200 kilometers per hour so it travels 33.33 meters per second, a 20Hz soundwave has 20 waves per that 33.33 meters so each wavelength is 1.66 meters (roughly 65 inches). You need that distance from the driver for you to actually hear 20Hz (not many people can really hear down to 20Hz nor up to 18kHz), when you are in a small enclosed space, the reflection of the soundwave start to interfere with each other and start creating harmonics and standing waves. When you play a 20Hz tone in your car, you would be hearing more of the harmonics (40Hz, 80Hz, 160Hz in the order of magnitude are harmonics of 20Hz note) than the actual tone you are trying to reproduce.kapsurf said:
Ding Ding Ding...the period of a low end frequency is longer, a lot longer the say 5K.....so it nneds to travel away a bit them the way bounces back and it has the distance to hit you and not over shoot you