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I was reading an article off the internet and came across this interesting one that discusses the possibility of producing low frequency in a car environment. The author argues his theory by using the logic of science and sound behaviour which is interesting and enlightening. To begin, we must first understand that Wavelength=speed of propagation/frequency So, to effectively reproduce freq of 20Hz in a car and by applying the formula above, taking into consideration that audio transverse at 340m per second or 1,122 feet at the temp of 21 deg celcius. We will have: Wavelength=speed of propagation/frequency 20Hz=1122/20 That means Wavelength of 20Hz=56 feet So, in order to reproduce 20Hz, you will need a car length of 56 feet. Where the hell can we find such a long car??? Bus?? Now, what about 40Hz then? Applying the same formula, the wavelength is at 28 feet. And at 80Hz???, you will need 14 feet to experience 80Hz!!! Now, that is ridiculous isn't it??? But in fact, it is possible. That is because car acoustic actually presents a near vacuum environment. The reason why sub freq range can exist in the car is because of the changes of internal car air pressure that creates what is termed as Transfer Function of Pressure Changes. Now, if the woofer and subwoofer have been installed properly and there are no serious leakages of signal or acoustic cancellation, it is really possible. Adding the fact that if the positioning of the speakers are in harmony with the subwoofer, the pressure in the car will react according to the audio, thus creating what we hear as sub freq, better still seismic (which is the ranges we feel). Of course, a lot will depend on the amplifiers and the crossover point including the db/oct slope which cannot be neglected at all. The vacuum environment at the car boot must also be air-tight which is a determinant of whether your sub ranges can be reproduced effectively.