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Old 12-09-2009, 06:07 PM
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Ω rise is way too high..
 
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Default Is A Port Really Just A Port?

So I have heard this before, but wanted to see what you guys think, because I think this is worth talking about when building a box. Is there any advantage to firing a port in the same direction as the sub? Or is a port a port? When thinking about it, wouldn't sound waves be less obstructed if they would just go backward from the sub, and fire right out the port, instead of working their way around a sideways port? I understand that the movement of air wouldn't really matter, but I'm thinking about the sound waves. I think it would be an interesting test, 2 boxes, same sub, power, size and port size, ect. and see if it really does make a difference. Opinions?
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Old 12-09-2009, 06:18 PM
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vehicle dependent really in most cases
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Old 12-09-2009, 06:22 PM
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Kinda interesting
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Old 12-09-2009, 07:36 PM
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Ω rise is way too high..
 
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Quote:
Originally Posted by zfrerichs View Post
vehicle dependent really in most cases
okay, so vehicle dependent could be a factor. but 1vs1, do you think firing the same way could have an affect?
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Old 12-09-2009, 07:40 PM
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both firing the same way combines the waves and a wall with a port back will suck
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Old 12-09-2009, 07:41 PM
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explain, i is lost..kinda
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Old 12-09-2009, 07:49 PM
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the port reveres the waves from the back of the sub. so the waves that start 180* out of phase are now in phase so makes the wave from the front of the sub more powerful
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Old 12-09-2009, 07:57 PM
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Sub and port positioning is all car dependent. Look at CRX's for example. Some are louder sub/port up, others sub up port back, still others subs forward port back. Same reason some SUV's are louder sub/port up, and others sub/port back.
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Old 12-09-2009, 08:20 PM
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a port is not just a port. not all ports are created equal.

You actually want some "obstruction" to the wave.

Air molecules sit in a port and actually react separate but proportional to the wave movement in the enclosure. The vibration in the enclosure cause the air sitting inside the port to also vibrate back and forth like a spring.

Firing ports into corners or into a hatch can help "load" or create a back pressure to match the wave propagating from the port to the air sitting in the car.

It is also important to align the wave being propagated by the port to the wave being propagated by the woofer. Finding the right distance apart and the right angle to time the wave alignment is crucial to high SPL.

Understanding how ports work is the difference between barely breaking a 150 dB, and doing a 158 dB in street class.
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Old 12-09-2009, 08:20 PM
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as long as it's no wall
the position jsut changes how strong and how long the waves are when combined together
dammit ed you beat my post that was directed at 98
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