Garage Storage Organization and Garage Cabinets

Paul Niwranski · 02-23-2004, 02:57 PM

Quote:

Originally posted by lemonlime:
So long as those subs are in phase, the sound waves should cause constructive interference. (Been a while since I've been in physics, but I think that is the correct term for it)..

__/\__ + __/\__ = same waveform with approximatly double the amplitude

__/\__ + --\/-- = ________ <--no sound, or very little.

Nothing like ascii examples [img]tongue.gif[/img]

Reflections from rear waves returning from the back of the trunk can still cause cancellation, but having subs face each other should not cause cancellation, so long as they are in phase as Dereck mentioned above..

See now this is where a little bit of knowledge gets dangerous

Sound waves, being sinusoidal, have a positive and a negative. Changing the frequency will change the 'length' of the wave. With these two bits of info one can see how at a frequency that has a wavelength that is exactly the distance between the woofers the opposing waveforms will form a 'figure 8' and nullify. Every multiple of that frequency will nullify too. BUT, as I mentioned and Dereck mentioned, the woofers are close enuf that this won't happen.

It's still damn ugly. [img]graemlins/puke.gif[/img]

Paul Niwranski · 02-23-2004, 02:58 PM

Quote:

Originally posted by SUX 2BU:
Looks like the car is a Dodge Avenger or Chrysler Sebring. I liked the install in mine better

That's cuz your install didn't suck. [img]graemlins/thumb.gif[/img]

Rye · 02-23-2004, 03:09 PM

it that an old Cadence amp on the left? 75x2?

[ February 23, 2004, 03:09 PM: Message edited by: WaTTZ ]

lemonlime · 02-23-2004, 04:09 PM

Quote:

See now this is where a little bit of knowledge gets dangerous

Sound waves, being sinusoidal, have a positive and a negative. Changing the frequency will change the 'length' of the wave. With these two bits of info one can see how at a frequency that has a wavelength that is exactly the distance between the woofers the opposing waveforms will form a 'figure 8' and nullify. Every multiple of that frequency will nullify too. BUT, as I mentioned and Dereck mentioned, the woofers are close enuf that this won't happen.

It's still damn ugly. [img]graemlins/puke.gif[/img] [/QB]

Ahhh, now its coming back to me, gotta brush up on my physics [img]tongue.gif[/img]

Interesting stuff.. So I'm guessing the phenomenon won't happen in this case because the wavelength of most sub bass frequencies are fairly long right? several meters or more?

I recall the formula for wavelength being amplitude or voltage over frequency. Would the output level also be a factor?

Orion_95 · 02-23-2004, 04:16 PM

Quote:

Originally posted by lemonlime:

I recall the formula for wavelength being amplitude or voltage over frequency. Would the output level also be a factor?

You recall wrong. Wavelength=speed of sound/freq.

ie 1130/20hz (speed of sound in feet) = 56.5 feet.

[ February 24, 2004, 01:09 PM: Message edited by: Orion_95 ]

**JohnVroom** · 02-23-2004, 04:49 PM

^Smart little cracker aint you

Orion_95 · 02-23-2004, 06:42 PM

what can I say...I'm canadian. We are naturally smarter.

[img]graemlins/thumb.gif[/img]

**JohnVroom** · 02-23-2004, 08:18 PM

And humble [img]tongue.gif[/img]

lemonlime · 02-23-2004, 09:33 PM

Quote:

Originally posted by Orion_95:
</font><blockquote>quote:</font><hr />Originally posted by lemonlime:

I recall the formula for wavelength being amplitude or voltage over frequency. Would the output level also be a factor?

You recall wrong. Wavelength=freq/speed of sound.

ie 20hz/1130 (speed of sound in feet) = 56.5 feet. </font>[/quote]Man, no wonder I failed physics [img]smile.gif[/img]

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