without having the most expensive subs or anything just a good install whats a good db reading? my friend says its around 120 but i think it should be around 135 thats where you start to really feel the spl what do you pros think???????
you really cant judge how loud something is "by-ear"...some frequencies will seem louder than others to the human ear.
120dB isnt that loud at all...but 135dB is starting to get pretty loud. If you are doing 135dB and it sounds pretty good (SQ), then you have a nice bumping lil system.
Just for an extra lil tid-bid of info.. if i'm not mistaken, it is illegal in the US to expose an employee to noise levels over 140dB w/o hearing protection. (I enjoy bass that is over 140dB though...go figure)
By the way, what do you have in your system and what car is it in?
It depends on that car it is in and what frequency is being played.
A 30hz frequency at 135dB would rattle stuff pretty well...lol My truck does roughly 145dB @50hz...but i havent got to play any low notes in it yet. Its pretty loud though, lots of stuff rattles and the back glass flexes all over the place. I cant leave a CD or sometimes a cellphone on the center console in the truck...it will fall off.
Yea...SUV's tend to like lower notes, so your jeep is prolly peaking between 40-50hz. SUV's have move room for the wave to develope, that why they peak at lower frequencies...and that is why they "sound" louder to the ear.
It is harder to get a low note loud though...your sub has to move more air to create the wave. That is why guys in CRX's can do 150's @ like 60hz easier than a guy that has an SUV that "likes" 40hz.
my stuff is pretty simple in my car i'm running all infinity speakers and subs, i measured it the other day with "late nite tip" (3 6 mafia) and it just went crazy mad (the reader) i used this one from a local shop in my area cuze he wanted to "sound check" it to see if it was a good install (i installed everything myself) and he was very surprised that it read 136 to 139. my wiring looks clean and the subs are infinity DVC reference series (not the best) they are in a ported box tuned to 30 HRZ wired in series, the car is a honda civic. anything from 3 6 hit soo hard, i have dynamat everywhere and it still rattles other things