first off what is the real advantage/disadvantage to this
i have an old 12" pioneer sub and it seems like you can onl;y "feel" it within 7-8 feet of it you can hear it but not really feel it beyond that is this normal it is powerd by my reciever with 220 watts
firing the sub downward can use the vehicle to resonate the output. you need a sub tht's designed to be mounted that way though. you need to calculate the "sag" of the driver's suspension to see if it'll work.
Percentage of Sag = 24,849 / ( Xmax * Fs²) If Sag% < 5%, the driver may be mounted down (or up) firing. (Xmax in milimeters.)
Fs - This parameter is the free-air resonant frequency of a speaker. Simply stated, it is the point at which the weight of the moving parts of the speaker becomes balanced with the force of the speaker suspension when in motion. Can get that usually from the manufacturer's website. Not sure about what format the Xmax should be in. * = multiplying
So 24,849 divided by the quantity of Xmax multiplied by Fs squared.
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