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rear deck ports


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tschicky 
Member - Posts: 16
Member spacespace
Joined: June 16, 2008
Location: Canada
Posted: June 24, 2008 at 8:43 PM / IP Logged  
So I have a typical sedan that has had a decent stereo installed into it. What can I expect from placing ports into the back deck. Will it increase the bass in the cabin or just make it muddy and sloppy? Will the ports act as a ported box and create port noise if I do not calculate them properly?
Also what is the easiest way to isolate the high's/mid's. They are currently built into the back deck and alot of sound is lost into the trunk. Is there a product that fits around them, or should I fabricate my own?
Thanks for the help guys.
sedate 
Silver - Posts: 1,173
Silver spacespace
Joined: July 03, 2004
Location: Colorado, United States
Posted: June 24, 2008 at 9:43 PM / IP Logged  

No they won't act as tuned ports - unless you make them really long and restrictive or something.

But this tends to let in alot of trunk-lid rattle and never seems to add much SPL - nevermind it rarely looks decent.

The rear speakers aren't "losing" sound into the rear trunk - this is just how speakers work.  Sound emenates off the rear of the cone as well.

You could get something like this but I think they make infinite-baffle (that is to say, car stereo) speakers sound terrible:

http://www.partsexpress.com/webpage.cfm?FILTER=XTC&FTR=XTC&search_type=main&WebPage_ID=3

I wouldn't bother enclosing the speakers or porting the rear deck.

"I'm finished!" - Daniel Plainview
jar754 
Copper - Posts: 142
Copper spacespace
Joined: December 16, 2003
Location: Illinois, United States
Posted: June 25, 2008 at 12:39 AM / IP Logged  
go with a bandpass box ported thru the rear deck
mcben789 
Copper - Posts: 171
Copper spacespace
Joined: October 01, 2007
Location: Mississippi, United States
Posted: June 26, 2008 at 12:58 AM / IP Logged  
I always hear to put the port on the same side of the box that the sub is mounted--on the same baffle i think. So when I see pictures of people with subs facing to the back of the vehicle and a port somehow running up to the rear deck I always wonder if its wrong.
It sounds like too much trouble for not-that-great results. (besides saying to your friends, "hey i have ports coming inside the cabin of my car.")
Sasquatch...
We know your legend's real...
jar754 
Copper - Posts: 142
Copper spacespace
Joined: December 16, 2003
Location: Illinois, United States
Posted: June 26, 2008 at 5:52 AM / IP Logged  
i used to have 2 jlw4 d4 in a bandpass ported the the rear deck of a 98 cav z24 and it friggen pounded, smooth clean bass!
DYohn 
Moderator - Posts: 10,740
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: June 26, 2008 at 9:57 AM / IP Logged  
Placing a subwoofer system in a trunk and openings into the cabin can indeed turn your entire vehicle into a bandpass enclosure.  Not recommended
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