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newb question about sound with trunk open


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bigwise1 
Member - Posts: 39
Member spacespace
Joined: December 28, 2004
Posted: January 03, 2005 at 5:49 PM / IP Logged  
I have two jl 10w6v2 in a sealed box facing the rear and when the trunk is open and volume is up they start making a weird sound (distortion?).  Talked to the shop that did the install and they said the trunk needs to be closed because when closed the trunk is sealed and  the air acts like a cushion for the woofers and pushes them back.  Does this sound right?  I've heard many systems blast with trunk open and none of them sounded like mine.
actionjackson 
Copper - Posts: 59
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Joined: December 20, 2003
Location: United States
Posted: January 03, 2005 at 9:28 PM / IP Logged  
it does make sense what your shop told you. Its designed  to be in a sealed trunk
Jamie Jackson
*CRIMPING AINT EASY*
oldskool92 
Member - Posts: 4
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Joined: January 03, 2005
Location: United States
Posted: January 03, 2005 at 9:36 PM / IP Logged  
Absolutely, Your subs are going to sound differently when your trunk is open, because they are going from a very small room to an infinite room, and the air pressure on the cones changes.
I'm gettin' 2 old for this sh*t!!
overworked 
Copper - Posts: 133
Copper spacespace
Joined: November 09, 2004
Location: Australia
Posted: January 04, 2005 at 6:41 AM / IP Logged  
make those cones bounce baby oh yeah!!! gotta love that question, Distortion? yes it is most likely distortion as when you open the boot there is no contained pressure stopping the cone from overdriving and reaching it's P2P limit causing that "weird sound". Lower levels maybe alright, but do not run at high levels for any lengths of time....anyone smell tinsel leads burnig?
stevdart 
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: January 04, 2005 at 5:01 PM / IP Logged  

I don't buy it.  A speaker in a sealed enclosure means that the back of the cone is sealed, not the front.  Speakers don't need both sides in sealed enclosures.  If the front had to be that way too they would have specs on how much air space in the trunk there has to be!  C'mon guys, that's nuts.

My guess is amp gain set too high.  They likely sound like that all the time and you hear it differently in the vehicle.

archemedes 
Copper - Posts: 172
Copper spacespace
Joined: September 08, 2003
Location: United States
Posted: January 04, 2005 at 6:17 PM / IP Logged  
the interior of a car is also a sealed enclosure, to make sound air needs to compress it takes alot more power to do that outside since it won't actually compress just move. Look at outdoor concerts the speakers and enclosures are usually different from indoor ones
supradude 
Silver - Posts: 915
Silver spacespace
Joined: September 21, 2004
Location: South Carolina, United States
Posted: January 04, 2005 at 10:03 PM / IP Logged  
If you raise the trunk (or hatchback) of a vehicle, it will change the sound of the bass. I don't think "distortion". Usually the "deepness" of the bass will fade some.
'85 Toy
jstruckman 
Copper - Posts: 465
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Joined: May 03, 2004
Posted: January 04, 2005 at 10:20 PM / IP Logged  

My guess is your subs are distorting at the same volume with the trunk closed also, you just cant hear the distortion as well with the trunk closed. If an installer told me that you had to have the trunk closed or the subs would distort i would tell him he is full of sh!t!!!It will sound different opened and closed, but not cause distortion.

Jazzy

petergozinya 
Member - Posts: 31
Member spacespace
Joined: December 30, 2004
Location: United States
Posted: January 04, 2005 at 10:29 PM / IP Logged  

scientist call it TRANSFER FUNCTION  you and someone else could talk about that all day. I't hurt my brain's,sound waves reflect, energy ,energy, energy...let's stick with this ..for now ..when WE run energy like we do we knock stuff off the wall's and bust windshields out...why ...anytime you make somethingmove it creates friction..guess what that make's./from start to finish we turn heat to bass wave's and back to heat=friction-------of course that big air pump has alot to do with your hatch being open or your trunk. But what ARCHEMEDES said earlyar =having that lid closed will keep the sub's impendence lower, becouse of the compression, depending on the resonant's of you're application(anything absorbed ) it was turned into heat! IN SOME ISTANCES (THIS IS TUFF) A bass wave at certin lenth will 'bounce'

this iz hard,i do know how to explaine it but it take's year's.. s.o.s     thad

bigwise1 
Member - Posts: 39
Member spacespace
Joined: December 28, 2004
Posted: January 04, 2005 at 11:04 PM / IP Logged  
So are my subs distorting when the trunk is closed? 
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