Contour Enthusiasts Group Archives Forums Modifications Audio Rear Deck free-air Sub question.

Wave "propagation"??? In an auto??? Important for impact??? IIIIIII don't think so...

If anything, tranfer function in a car OVER exaggerates impact. About the only thing
true SUB bass gives up in an auto is stereo
separation because as you say, there is no
room for wave propagation.

Oh and Dave... Necrophiliac?

Does DSO (Detroit Symphony Orchestra) have another meaning?!?

Yea well what about the theory that in order to really hear or feel a bass note the distance the ears should be from the driver reproducing the bass frequencies should be equal to the length of the note being reproduced. Within the contour the longest line in the passenger cabin is eight feet. Now you guys are probably talking about standing outside of the contour listening to music being played from within the contour.

What is the listening position the mic is in during the high spl contests, in the car or outside of the car, where passengers would normally hear the music? Just curious.

I beliece the microphone is set on the dash, in the center.

As for distance form a speaker to hear or feel something, it doesn't matter. Sound Pressure Level meter. It measures something one would feel at any given distance. Playing a 15Hz sine wave through my home subs with about 1250w rms total, the only things my ears can really hear are the house things (walls, pictures, furniture) moving because of all the presure (moving a lot of air, here). I cannot actually hear much of the note.

Speed of sound ~= 1100ft/s at sea level

15Hz wavelength = 73ft. Play it in your car and you'll feel it, whether you sitting 5, 10, or 75 feet from it.

If your theory was correct, you could only hear one freq at any given distance from a noise source.

A pair of headphones is a prime example. In your example, they could only play very high midrange and treble because the distance is so short.