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<blockquote data-quote="T3mpest" data-source="post: 6374805" data-attributes="member: 560148">I was simply referring to a home needing more low end reinforment as they don&#039;t have a much gain from the enviroment, this is because a car much smaller than the average room.&nbsp; That&#039;s why small cars can get good bass with a single 12 sealed and yet almost all higher end setups use large subs tuned very low vs a car tuning, since room gain occurs much lower in frequency, the rooms are longer.&nbsp; Your correct in that the waves reflecting is what causes cabin gain but it&#039;s not cancellation it&#039;s almost always an increase.&nbsp; Tom covers it very well with a bathtub vs swimming pool analogy, the waves are simply too close together when you put a 45foot wave in a 10foot long car, it rarely creates nulls, it&#039;s just an increasing gain as you get lower and lower in frequency. Rooms are usually big enough to have a few nulls and have cabin gain kick in much lower since the rooms have a larger maximum dimension.<a href="http://www.caraudiobook.com/car_audio_cabin_gain/car_audio_cabin_gain.htm" target="_blank">http://www.caraudiobook.com/car_audio_cabin_gain/car_audio_cabin_gain.htm</a><a href="http://www.nousaine.com/pdfs/Free%20Bass.pdf" target="_blank">http://www.nousaine.com/pdfs/Free%20Bass.pdf</a>Note: cars are normally 10-15 feet long this corresponds to 112hz-70 as the starting figure for cabin gain using the formula linked.&nbsp; Most estimates are usually 12db/octave below 80hz for this exact reason.&nbsp;&nbsp; Shape of the car isn&#039;t nearly as relevant as the waves barely see the shape of the vehicle anyway. No matter which way you face a box in a big car your unlikely to get as much of a gain as you will by simply throwing it in a smaller car, a fact many on here can attest too.</blockquote>

[QUOTE="T3mpest, post: 6374805, member: 560148"] I was simply referring to a home needing more low end reinforment as they don't have a much gain from the enviroment, this is because a car much smaller than the average room. That's why small cars can get good bass with a single 12 sealed and yet almost all higher end setups use large subs tuned very low vs a car tuning, since room gain occurs much lower in frequency, the rooms are longer. Your correct in that the waves reflecting is what causes cabin gain but it's not cancellation it's almost always an increase. Tom covers it very well with a bathtub vs swimming pool analogy, the waves are simply too close together when you put a 45foot wave in a 10foot long car, it rarely creates nulls, it's just an increasing gain as you get lower and lower in frequency. Rooms are usually big enough to have a few nulls and have cabin gain kick in much lower since the rooms have a larger maximum dimension. [URL="http://www.caraudiobook.com/car_audio_cabin_gain/car_audio_cabin_gain.htm"]http://www.caraudiobook.com/car_audio_cabin_gain/car_audio_cabin_gain.htm[/URL] [URL="http://www.nousaine.com/pdfs/Free%20Bass.pdf"]http://www.nousaine.com/pdfs/Free%20Bass.pdf[/URL] Note: cars are normally 10-15 feet long this corresponds to 112hz-70 as the starting figure for cabin gain using the formula linked. Most estimates are usually 12db/octave below 80hz for this exact reason. Shape of the car isn't nearly as relevant as the waves barely see the shape of the vehicle anyway. No matter which way you face a box in a big car your unlikely to get as much of a gain as you will by simply throwing it in a smaller car, a fact many on here can attest too. [/QUOTE]

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