Question about SPL Peak in a car

[DJ Q]

tuning a box to a specific freq doesnt mean it will peak in a car
for example the graph below is a box tuned to 25hz peaking at 40hz in a car

Now how do I find the optimum tuning for my enclosure in terms of SPL?

Just build and test?

For example, my car peaks at 59 Hz, so i built a box at 58Hz and got 137.9dB(rush thing)

Is there any form of calculation one can use instead of wasting wood

[-bushman-]

run a sine sweep in the car & see what you peak freq is & then build box

[spam]

that is not wah he said he do ?

[-bushman-]

nah he build, test, then build again.

[jeff]

last ice meeting we had a detailed discussion of this

For example, my car peaks at 59 Hz, so i built a box at 58Hz and got 137.9dB(rush thing)

u are correct this is not the way to do this
BUT in spl even tho there are alot of calculations trial and error is a big part of it

food for thought
if a car has a "resonating freq" then no matter how u place the enclosure then you should get the same 'freq"??? of course this is wrong

there is more to it than just a "resonating freq"..too much info is being given of on the internet, even on this forum by people who are guessing

the secret lies in BASIC physics that silent spoke about on the first day but people didnt want to listen

[SR]

correct

as well as anyone who attended the box building seminar should know how to proceed to calculate this

use a correct sealed enclosure for a 10" sub small power

apply a sine sweep and measure for peak spl and at what freq and this is your start pt to use in designing your spl enclosure

keep in mind

sound damping
seats ets will change this freq

as well as when the enclosure is built especially if it is a wall the freq will also change

this is jsut the basic

[- Rovin's car audio -]

trial & error - i dont think there is a perfect method

try different things & see a different result - as little as 1" on a port length can yield a noticeable result on a db meter ....

[riadb]

Q ent i tell u bout dis already??

[DJ Q]

nah he build, test, then build again.

No i test then built. I used my music box for the sweep

if a car has a "resonating freq" then no matter how u place the enclosure then you should get the same 'freq"??? of course this is wrong

exactly... when facing the sub forward, my peak is 42hz... when facing it to the trunk, 59hz



**sigh**

trial and error it is

where to start?

[-bushman-]

well seeing as though you hav 2 different peaks, see which of them requires the least power to achieve & go with that one

my guess will be the higher freq one

[jeff]

djg ive never seen your setup , i dont know what car u have, but i can tell you that front of your sub box to the spl sensor is between 6.5 and 7 feet
and most probably you have your port on the same plane as the sub
and you have a sedan
ask yourself how i know these things, that is where your answer lies

i wont say anymore on this, as a few people are about to rush in here and post wrong things and confuse the thread
come to the ice meetings, some of the most knowledgable people in the Country are there

[yos19]

lol...this might get good

[DJ Q]

and you have a sedan

no i don't

[jeff]

hard luck there
ent is 2000 watts u runin there

[DJ Q]

yep

[TK!]

come to the ice meetings, some of the most knowledgable people in the Country are there

buh i nvr come ... ha .. ha .. *cough* ... huuuhhh... okkk... back to normal

[D-REDWAGON]

Q doh study it boy D victory is always sweeter when u cry blood sweat and tears to attain it.

[DJ Q]

right now i rel crying because i still have no car