just got owned...so f*&^%$g pissed!!!

Bwcad1 · Post by **Bwcad1** » Thu Feb 22, 2007 5:24 pm

planet audio amps arent that bad.

Jonathan · Post by **Jonathan** » Thu Feb 22, 2007 5:32 pm

solacedagony wrote:I wasn't aware that you could have TOO small. I guess that's because of the huge wavelength of bass frequencies? That very well may be why my standard cab truck does great in midbass, but not subbass.

Like the above statement, an enclosure inside an enclosure. It's not really that you can have too small, because after all compression is a good thing, that's why things get so loud underwater. In the case of a truck, it's both the cabin resonance combined with the potential for standing waves. Roll your windows down, resonance lowers.

Jonathan · Post by **Jonathan** » Thu Feb 22, 2007 5:48 pm

The "distance for the wave to develop" is a myth, BTW. If that were the case, we wouldn't be able to hear jack when we were wearing headphones.

It's really a deal of cancellation. When the wavelength is below the resonant frequency of the cabin, the environment is pressurized due to reflections. This is where cancellation/standing waves can occur

Bwcad1 · Post by **Bwcad1** » Thu Feb 22, 2007 5:49 pm

Jonathan wrote:The "distance for the wave to develop" is a myth, BTW. If that were the case, we wouldn't be able to hear jack when we were wearing headphones.
It's really a deal of cancellation. When the wavelength is below the resonant frequency of the cabin, the environment is pressurized due to reflections. This is where cancellation/standing waves can occur

Tell scott owen's that

solacedagony · Post by **solacedagony** » Thu Feb 22, 2007 5:58 pm

Jonathan wrote:The "distance for the wave to develop" is a myth, BTW. If that were the case, we wouldn't be able to hear jack when we were wearing headphones.
It's really a deal of cancellation. When the wavelength is below the resonant frequency of the cabin, the environment is pressurized due to reflections. This is where cancellation/standing waves can occur

So you feel I'm getting a buttload of cancellation inside the cab?

JeremyC · Post by **JeremyC** » Thu Feb 22, 2007 6:04 pm

Jonathan wrote:The "distance for the wave to develop" is a myth, BTW. If that were the case, we wouldn't be able to hear jack when we were wearing headphones.
It's really a deal of cancellation. When the wavelength is below the resonant frequency of the cabin, the environment is pressurized due to reflections. This is where cancellation/standing waves can occur

You know your probably right, but I have to go with my experiances here.

I sat in a 99 extended cab S10 with 4 12s up firing, and turned right around and sat in mine with my single 12 down firing. Both were well sound dampned. Both were running high end equipment, and both installes were extreamly well done. Yet my single 12 sounded just as loud, and WAY more detailed.

I have sat in S10s with the subs firing forward, and my experiance was the same.

Bwcad1 · Post by **Bwcad1** » Thu Feb 22, 2007 6:10 pm

The thing is there are so many variables in vehicles you would never be able to isolate the reason for the change

Jonathan · Post by **Jonathan** » Thu Feb 22, 2007 6:12 pm

I'm saying soundwaves don't need "x" amount of distance to develop. A frequency is a frequency. If a cone vibrates 20,000 times in a second, you're going to hear that regardless of where you're located relative to the driver itself, it doesn't "need" a given environment to sound the way it does. The environment can, however, reinforce or take away from the sound due to how the sound interacts with the environment. They aren't going to change frequency or sound any different if it arrives prior to the wavelength. Like I said, if that were the case, then we wouldn't hear much when we had headphones in because you're talking about a fraction of an inch to travel, which would be the treble region.

Not saying that you don't need optimal volume in the cabin in order to achieve high SPL, just saying the "wave to develop" theory isn't the reason that certain vehicles lack SPL. Obviously when the wavelength is larger than the cabin it's in, then you're pressurizing said cabin. It's similar to turbocharging an engine. But like a poorly designed enclosure, you have the potential for reflections and standing waves as well, should it not be optimal geometrically. That's why competitors focus so much on the internal volume of their vehicles as well as put so much emphasis upon the tuning frequency.

If you want to prove the "wave to develop" theory, calculate the wavelength of a given frequency. Say 40hz. Set your subbox on the ground and stand that distance away from your subbox and let me know if it's any louder than it was when you were an inch away from the subcone. Have fun

What you're really worried about is the resultant phase of it all. When you have reflections, you have the incedent wave, the reflected wave, and the resultant wave.

JeremyC · Post by **JeremyC** » Thu Feb 22, 2007 7:16 pm

From a technical standpoint I agree. As soon as the freq leaves the cone it is formed. Its just weird that the exact same truck, with 2 diffrent setups can sound SO diffrent. Especially given the only real diffrence between the two is the pathway the bass is directed before it arives at your ears.

Jonathan · Post by **Jonathan** » Thu Feb 22, 2007 8:20 pm

Referred to as "loading". You're taking advantage of immediate reflections from the floor/walls of the vehicle in order to reinforce the sound wave. And, of course, these immediate reflections aren't too far out of phase with the original signal, thus cancellation isn't an issue.Tying in to what I said above-taking advantage of an environment

Same principle as corner loading in home audio, really