port facing same way as sub
Printed From: the12volt.comForum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=97801
Printed Date: April 29, 2024 at 11:09 AM
Topic: port facing same way as sub
Posted By: mcben789
Subject: port facing same way as sub
Date Posted: October 09, 2007 at 3:24 PM
Replies:
Posted By: JRoscoe
Date Posted: October 14, 2007 at 11:33 AM
Either will work. Its better if the prt faces the same way as the subs but if dealing with a car that has no seats to turn down, or like my mercedes with a gas tank in between the rear seats and the trunk then porting thru the rear deck will work also! I currently have my port facing the same way as the subs into the trunk
But will be redoing it up thru the rear deck with the subs firing into the trunk the same as they are now. The only way you dont want to do it is the opposite way of the subs.
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Posted By: mcben789
Date Posted: October 14, 2007 at 7:01 PM
Posted By: alpinewil81
Date Posted: November 02, 2007 at 12:18 PM
Hmmmm.... I WOULD NOT say NOT to go the opposite direction of the subs. If you go the opposite way of the subs, you must have a baffle between both air movements or you get a minor cancellation effect. If you are using a port, you aren't directing or diverting air flow to or away from a sub. What you are doing is channeling the resonant sound that is created from the sub. Yes you here air movement from a port, however, install some quilt matting on at least 3 sides and then all you're goint to get from a port is sound. You can install a port any direction in relation to the subs, just not directly be hind it. You can modify port lengths and offset the ports to the side of the sub and be just fine if you calculate properly. Here are a couple of pics of what I and some fellow installers have done in a couple of instances:
Here is my most recent project my own personal SAAB. Two MA Audio HK80 8" subs with a Clif Designs amp (that's the amp rack you can see floating in front of the subs). Guess which way the ports are facing... right towards the drop down arm rest with trunk access in the back seat. Sounds great, why? beacause I built a trim piece that is flush on four sides and acts like a baffe to seperate air movement from sound. I could have went strait up with the ports but chose not to.
Here's another car that was done by some guys I know that build demo cars for Alpine Electronics out of SLC Utah. I was just there to visit the finished project. There are 3 tens... and quess what, drop the seats and you will find 3 ports firing directly into the rear seats themselves. This car thumps. If the pros that build demo cars don't know what they're doing then we are all screwed!!!
Besides, if you port a box and don't like it, you can plug the ports. They do make port plugs that are a rubber diaphragms that expands to close the ports and they are also removable. Some people use pipe plugs from Home Depot... same thing and readily available if you size your ports right. Yes, I know, ported boxes require more air space than sealed. If the box is built well and doesn't leak with a sealed port, a little extra air space (definitely be careful not to much) will help the reproduction of sound. The reason sealed boxes use less air space is to control the cone of the sub from over excurting under heavy loads. When the air can't move neither can the cone. Hence the reason sealed boxes require more power. To much air and you have a sloppy response and are more likely to trash your sub... Anyway, I hope this helps you out. Good luck with your box building!!!
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Once an installer... always an installer. It's love, not habbit.
Posted By: aznboi3644
Date Posted: November 02, 2007 at 2:26 PM
Posted By: DYohn
Date Posted: November 02, 2007 at 3:03 PM
Posted By: splaudio
Date Posted: November 03, 2007 at 6:41 PM