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<blockquote data-quote="qtipextra" data-source="post: 1894854" data-attributes="member: 555270">The rule of cabin gain. When you are all sealed up, your whole car acts like a sealed enclosure, and the subs are pushing against the air tight chamber. When you roll down a window (allow more air to move freely), all of a sudden more movement can be achieved, and that results in higher SPL. On the trunk issue, thats because your car relies on the trunk to bounce the waves to the rest of your car (up front). If you open the trunk, it&#039;s gong to go stright out, and not into the cabin. But windows is a totally different thing, because they are up front after the waves have already reached the cabin, and then allow more air to flow. Yes its going outside, but the more air flow you have, the more SPL you are going to have in the cabin as well.On a second note: I dont like the sound of my system at high levels with my windows up. It just doesnt get as loud. A simple crack of the window will fix it. Unless im on the freeway, or moving real fast, then I just turn the bass down and listen at lower levels until im in slower speed ares.</blockquote>

[QUOTE="qtipextra, post: 1894854, member: 555270"] The rule of cabin gain. When you are all sealed up, your whole car acts like a sealed enclosure, and the subs are pushing against the air tight chamber. When you roll down a window (allow more air to move freely), all of a sudden more movement can be achieved, and that results in higher SPL. On the trunk issue, thats because your car relies on the trunk to bounce the waves to the rest of your car (up front). If you open the trunk, it's gong to go stright out, and not into the cabin. But windows is a totally different thing, because they are up front after the waves have already reached the cabin, and then allow more air to flow. Yes its going outside, but the more air flow you have, the more SPL you are going to have in the cabin as well. On a second note: I dont like the sound of my system at high levels with my windows up. It just doesnt get as loud. A simple crack of the window will fix it. Unless im on the freeway, or moving real fast, then I just turn the bass down and listen at lower levels until im in slower speed ares. [/QUOTE]

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