i was wondering to get a general idea of what i am gonna hit around so i was wondering what did everyone hit at and what r u running?
also is there ne way i can tell what i am gonna hit at or around?
check profile for what im running
first off...let me be the first to say it.
NOOB
with that said
here is your answer.
Concept Basic DB Formula
-This formula is assuming that all things are perfect. It is a Logical "Guessimate" that is always within 3 db of actual!
-That voltage is near 14 volts/plenty of
battery/alternator
-Using at least 1/0 Ot guage wire
-Some kind of Line Driver is being used
1st Things first
Start off with sensitivity of the "raw" driver
Then total power of the amplifier (peak AC
volts measured with a volt meter)
For example: Take a Concept CC-D1200 amp, connected to 2 SS-12( a load of 1 ohm) You've measured the AC volts out into this speaker load as 42 volts, which calculates to 1764 "peak" watts. A/C volts squared (times itself) divided by the impedance equals power. So...42 x 42 =1764 divided by the impedance, which is 1 ohm in this instance, so its still is 1764!!! We now know the real power (cause you measured it into a real load...The Concept SS-12 woofer)
2nd Thing
Calculate the toal efficiency of the woofers
Add each woofer as +3, doubling of cone area
equals output
The concept SS-12" subs are 87 db 1W/1M (typical of all small box woofers"
Lets do the dB Log:
1 woofer = 87 dB
2 woofers = 90 dB
4 woofers = 93 dB
3rd Thing
Do the "dB log" starting with the total subwoofer(s) efficiently (which is 93 in this instance)
93 dB = 1 watt
96 dB = 2 watt
99 dB = 4 watt
102 dB = 8 watt
105 dB = 16 watt
108 dB = 32 watt
111 dB = 64 watt
114 dB = 128 watt
117 dB = 256 watt
120 dB = 512 watt
123 dB = 1024 watt
(for the example, we have 1764 watts, (comtemplate... 125 dB)
126 dB = 2048 watt
4th Thing
Add up the special "side deals" Like is the box sealed (no extra dB), hatchback or coupe? Etc.
Use the following to get "close to the REAL DEAL in SPL.
-Transfer Function (sedan) = 12 dB
-Transfer Function (hatchback with woofers aiming towards the rear glass) = 16 dB
-Sealed Box = no extra dB
-Vented box = 3 dB (UNLESS you have an odd order alignment)
-Vented box = 6-9 dB (If an odd order alignment - Big A$$ box)
-BandPass Box = 6-10 dB (depending on how small the enclosure is)
-Mic Placement = 6 dB for DB drag dash/window mic placement
Example: let's total it all up
124 dB (basic "dB log") + 12 dB (standard cab car with a direct facing woofer box) = 137
Woofer box is vented in something other than optimum or flat + 6 dB = 143 dB
+6 dB (DB drag dash/window mic placement)
So...this car will play
= 149 db (total) (+/- 3 dB)
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
dude wtf is ur problem.
everytime i post ur an @!#$ and come back with stupid responses if u dont want to answer my questions then just stfu and dont and someone else whos not gonna be an ass will.
I run 2 12" RF He2's and I get enough pressure to blow an ear drum. At least it wasn't mine. but that wasn't in a cavalier
jbodycavalier03 wrote:dude wtf is ur problem.
everytime i post ur an @!#$ and come back with stupid responses if u dont want to answer my questions then just stfu and dont and someone else whos not gonna be an ass will.
that's THE most asked NOOB question ever..that's why i said that.
get the sand out of your vagina and you might have gotten the joke.
plus i did answer your question, so quit crying
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
jbodycavalier03 wrote:dude wtf is ur problem.
everytime i post ur an @!#$ and come back with stupid responses
dont worry..i don't single you out. actually i can't recall ever responding one of your topics
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
jbodycavalier03 wrote:dude wtf is ur problem.
everytime i post ur an @!#$ and come back with stupid responses if u dont want to answer my questions then just stfu and dont and someone else whos not gonna be an ass will.
Wow! you're an idiot. Did he not just type 5-6 paragraphs to help you out??
Go get you system tested...then you'll know. For all we know you could have a **** box and test really low. there are really too many variables...just go get mic'd.
Lash wrote:jbodycavalier03 wrote:dude wtf is ur problem.
everytime i post ur an @!#$ and come back with stupid responses if u dont want to answer my questions then just stfu and dont and someone else whos not gonna be an ass will.
Wow! you're an idiot. Did he not just type 5-6 paragraphs to help you out??
Go get you system tested...then you'll know. For all we know you could have a **** box and test really low. there are really too many variables...just go get mic'd.
werd yo'
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
my guess is low-mid 130's
click my sig for my stereo setup... its all setup and tuned for SQ but a rap song is DB'd at 139 (not exactly I think it was 138.9 or somethign real @!#$ close to 139 give or take a tenth or two)
Lot of math..... Well do what i am going to do... Enter in a comp this weekend. I know i will not win "Well pretty sure i will not " But i will know where i stand on dbs.....
Try it sometime ......They also have things called fun runs there where you pay 10 bucks and you test your system.....
Just find a UASCI event in your area Do all the Math like the guy typed.
wysiwyg first reply to the topic = sticky worthy for sure, well done man !
My Cav
I give up...
i'm buying a VW those people love trees, so they should love eachother too... "Andy"
theres a spl calculator on one of the sounddomain forums.
its says its accurate give or take 3 dbs.
might be easier that way, but you might wanna get mic'd either way tho.
happy happy joy joy
i have actualy found that formula to hold true so far to it's + or - 3 db margin. and i've applied it to several systems.
but yes..just go get metered. it's that simple.
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
i am going and getting metered i was just wondering in advance what if ne one knew what i was gonna hit around
im hitting 142.7 with a single type-r and only a 500 watt alpine amp pushing it with a alpine 9811 headunit in a cavi so there is an ideal of what maybe ur around.
Dale Marks wrote:I run 2 12" RF He2's and I get enough pressure to blow an ear drum. At least it wasn't mine. but that wasn't in a cavalier
HEheheheheheeheheheheheehhehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehehe.
No it didnt.
+/- 3 db is a huge range no wonder it works for you
^ very true.
Your formula doesnt take into account power compression, what frequency you are burping at, the Fs of the driver, the length of the vehicle, differences in how SPL is rated from company to company, wich direction you fire your subs, whether or not you are loading them off anything, cancellation, and a billion other variables.
I am sorry but that any any other method of attempting to predict SPL is a complete waste of time.
"all your bass are belong to us"
k well in a free shwo 157 than at a legal show(medicine hat) i hit 156.3, its all in the box i never listen to calculations wiht subs, you cna have crappy subs and still hit insane as long as u tune and make the box right
derf wrote:^ very true.
Your formula doesnt take into account power compression, what frequency you are burping at, the Fs of the driver, the length of the vehicle, differences in how SPL is rated from company to company, wich direction you fire your subs, whether or not you are loading them off anything, cancellation, and a billion other variables.
I am sorry but that any any other method of attempting to predict SPL is a complete waste of time.
HEY..I'M JUST ANSWERING THE BOY'S QUESTION!!! lmfao don't flame me for a formula i didn' t even write.
--------------------------------------------------------------
Offical dealer for the following-
SOUNDSTREAM
DB LINK
DB DRIVE
PANASONIC
GARMIN
ROSEN
SCOSCHE
XE DESIGNS
SOUNDGATE
PAC
LITEGLOW
Not flaming anyone. Its just a waste of time.
"all your bass are belong to us"
