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<blockquote data-quote="Ed Lester" data-source="post: 4367683" data-attributes="member: 587479"><p>Bold statement maybe but it comes with 14 years experience in SPL.</p><p></p><p>Its all about wave alignment. In SUVs and hatch cars, you usually have a lower cabin resonance than trunk cars. Having the subs face up or back will allow the source wave to fill the entire length of the vehicle. If the are facing forward from the back of the car then the source wave will hit the windshield with a resonant frequency higher than what the cabin resonance is. Then the the reflected wave from windshield to the back will have to travel further and have a lower resonant frequency. So basically you are creating a harmonic resonance in which the peak frequency of the source wave does not match the reflected wave. You want them both to match as much as possible to create higher SPL.</p><p></p><p>Walled vehicles and trunk cars with the trunk sealed off dont really have any airspace behind the source (subs) so they can have the same resonance on the source wave and the reflected wave.</p><p></p><p>The theories are here for your reference, you can try it if you want and see if the theory is correct. I always suggest test and tune as much as possible. Cant hurt to just try.</p></blockquote><p></p>
[QUOTE="Ed Lester, post: 4367683, member: 587479"] Bold statement maybe but it comes with 14 years experience in SPL. Its all about wave alignment. In SUVs and hatch cars, you usually have a lower cabin resonance than trunk cars. Having the subs face up or back will allow the source wave to fill the entire length of the vehicle. If the are facing forward from the back of the car then the source wave will hit the windshield with a resonant frequency higher than what the cabin resonance is. Then the the reflected wave from windshield to the back will have to travel further and have a lower resonant frequency. So basically you are creating a harmonic resonance in which the peak frequency of the source wave does not match the reflected wave. You want them both to match as much as possible to create higher SPL. Walled vehicles and trunk cars with the trunk sealed off dont really have any airspace behind the source (subs) so they can have the same resonance on the source wave and the reflected wave. The theories are here for your reference, you can try it if you want and see if the theory is correct. I always suggest test and tune as much as possible. Cant hurt to just try. [/QUOTE]
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