I do it mainly as a hobby. Some work under the hood, and others tear the entire interiors apart to make room for speakers, either for loudness, or for sound quality. I just really enjoy fabricating the enclosures for the subs and amplifiers, and making it look semi-factory looking(or completely not factory looking for shows). It's just something that some find appealing.
As for sitting inside while it's playing, you have to remember that the 151db was measured as a 'peak' reading, I wasn't driving around listening to it that loud all the time,(just most of the time).
Usually whoever is holding the stereo competition will provide earphones or something. I used to always bring my own.
I'll see if I can find my scale of references for decibals. A gunshot is something like 150 or so, and being at the launch site of a space shuttle is like 200 or so!! But keep in mind that every 2 decibals is the equivelent of doubling the sound.
Hopefully I have provided some insite, I'll post more.
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'middle finger is the flag that I waive when I am silenced' -Mudvayne
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