i know when you put a sub box inside of a car it changes the response of a box. and i know in some cases when you open the window it can improve or decrease that response. any how i built a sealed box with 2-12's. for my wifes car it was built to the manufacturers recomended size. we went for a drive and she stoped at a freinds house. left the car on and the stereo at a moderate volume. and when she opened the door the car started shaking. she closed the door and it quit! i then opened the door and left it open and could not believe the change. the impulse was so much stronger,deeper,cleaner and seemed quite a bit louder. i never heard that big of a difference before. and ive been doing this for 14 years. anyone else with results like this?
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maybe its because of cabin air that is moved with the door open there is way better chance for the air that your sub makes to move more freely. also maybe if its a small car. I have a honda prelude and this same thing happens when i open the door. also when i drive with the windows up it reduces my bass but only on the really low tones so now i always drive with the windows cracked a little about 4 inches just so my bass sounds good even though if its cold outside
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*hiccup*hey thanx sprahl85. the car i have it in is my wifes 96' taurus, so its not small noir real big.
i had this topic in the general discussion, now it's in car audio forum hmm.
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Every car i've had a system in seems to hit even harder when the door is open or the windows are down. I believe that it does have something to do with the cabin air pressure. All that pressure when the windows are up and nowhere to go. Also, It depends on where thw box is located in the trunk. How close to the rear of the trunk makes a difference, as well as turning the speakers to face the rear of the vehicle.
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Chilliphilli1968
usually i have noticed changes too with the number of systems i have installed. but nothing so dramatic. its like night and day. it has to do with my box was not matched to the air space in her car. now in a smaller car it may be a perfect match.
this is for stevdart : does your Taurus do this with your sub? i know the sub and box you have is about 1/4 the size im using. did you match it to the car air space or just to the sub?
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menace, I just built the box to the recommended size for that sub, .8 cu ft IIRC. It gets very loud, so I can't even imagine trying two subs in there (too old to give up that kind of trunk space!....need room for my beach chairs). I don't get any difference whatsoever with windows or doors open or closed, whether it's full loud or fairly quiet. You can just hear it from the outside real well when the window is open. Nothing changes inside the car. Maybe if it was twice the sub system this would happen to me too.
But you'll notice the sub faces sideways across the trunk. Maybe that's the key (?)
I don't think you have to match anything to car air space...do you? Just how much room you want to give up and how loud you can stand it to be.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
stevdart wrote:
need room for my beach chairs
Is that beach you are talking about have to do with corn fields?
I notice a difference when my back seat is folded down, but when my windows are open, it just makes for more road noise.
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stevdart wrote:
I don't think you have to match anything to car air space...do you?
years ago i remember david clark calling this the tranfer function. vance dickason i believe has published the formula to match the box, sub, and the car/truck cubic ft. but i cannot seen to find it.
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