I bet the cost of my system is probably less then half of what you payed for your gear. The speakers are not that big its just a 12" sub and a pair of 6x9's and its not even a high SPL sub or it would over power the sound of the 6x9's. I just posted because I knew my SLP of my junk and i dont spend loads of $$$ to compete or anything. I build for sound not SPL.
huh? I'm just saying I'm happy with my cheep junk, and I'm not putting down anyone else's gear. Because of the DB scale being that every 3 DB is twice as loud it gets tricky when twice the power is also required just to get 3 DB. I know a lot of other variables come to play also. But with what I have, I'm sure I would surprise you with the sound quality and the SPL i am getting from it.
WoW, nice! 15"ers in a car thats insane!As for the seemingly low Db reading It's because of the DB scale. For every 3 Db it is twice as loud as the previous. So when you get that high you need a high resolution DB meter to tell the difference more accurately then the ear can. Thats why you need to run so much power but you have one thing on your side. You have the hugh 15"ers they usually throw alot more sound per watt then a small speaker!
fryguy......that isnt how the "spl scale" works
its like this:
for every +3dB you will theortically need 2x the power (ex 100db w/ 100wrms...103dB w/ 200wrms)
and for every +10dB it will twice as loud.
the dB scale works on a logrithmic function...log base 10 if i remember correctly.
136dB 1 15" Cerwin Vega in a 4.2 cu. ft ported box tuned to 32hz. Powered by JL e1400.
haven't been metered yet, but system is asl follows: 1966 dodge charger whole car lizardskin lined/deadened 270A alternator 1x redtop 2x yellowtops 1/0ga distribution Orion MBR70 battery regulator alpine cda-7990 cd/tuner orion concept 97.2 1/3 octave 30+30 band eq orion 300psw pre-amp/eq 3x orion 2250sx amplifiers dynaudio system 3650 front stage 2x RE triple X 12" subs, sealed fiberglassed enclosures
it's a SQ system, but I'm guessing I should be in at least the mid to high 140s.
i hit in the upper 140's witha single 15" brahma mk 2!!!
----yesterday we had a local comp.and i won 1stplace in my class and overall,i hit 159.6db.i have a 99 honda civic with 4 15" bostwick dcl drag r subs ----4 bostwick 1100.1 amps(1 on each sub).150.4 bostwick amp for highs on 4"bostwick speakers and 5.25 componets up front and cdxm9900 sony headunit also i have 2 2fared caps and 2 yellowtop optima batteries---and guess what im still running oe alternator,system is doing good for now so im not going to upgrade untill i absolutely have to,would post more pics but it took forever for these to upload will though if someone wants to see progress of works -----sorry pics didnt post let me know if yall want to see
could just supply a link to the pics hosted elsewhere.
what mic and meter were used for this event? audiocontrol? term-x? burping with the car turned off would be fine on just the batteries you have. the alternator is needed more for use with the engine running above idle for extended use. SPL events are 15 seconds usually.. at full volume. batteries and capacitors are fine for that sort of event.
Anonymous, thanks for the correction. I messed up on that (I'm going to edit my post so its correct), thanks. The DB scale is a base of ten for double the loudness and for every 3DB requires twice the power. Thats where high effiency speakers make a huge difference.
I guess this forum don't allow you to edit posts other then the last post you made.
yea I actually did hit 160 with 2 13w7's running on 2 1000/1's. They are in my R32 which is prime for SPL plus they are in a 5.5 cu. ft ported box tuned to 29Hz. If you are pissed off that my 2 sub system beats your 3 sub system take it up with someone who gives a sh!t slap johnson.
remember everybody, every one of these scores maynot be compared to the other. each may have been scored using different mics. audio control tend to run 3 to 5 db higher than a termlab. termlab has proven to be the most consistent mic(sensor really) to date. this is in part thanks to it not being a mic, it is a sound pessure level meter. humidity and all other weather related conditions seem to impare most microphones(goldline,audiocontrol,ect.) by changing thier physical characteristics, thus relating in an inaccurate reading. however the termlab seems to fend off the conditions of its environment and produce the most consistent #'s we've ever seen in spl competitions. btw, nice # reppazzent and slap johnson, what mics were those #'s on and was it "legal"(sealed on the dash) or "outlaw"(open door/window in the kick)? also do you guys compete? i am a USACI member...
Ight i got 2 12" sony p5s in a ported box to the deminsions sony gave me. Look at my setup at www.cardomain.com/id/blazinahrent cuz i wanna know what im hittin. The amp im still not for sure if im pushin out the 900x1 or the 500x1 but im findin out.
I was watching Rides the other night when they set up a 70 'cuda with a 528 hemi crate motor.. Rad Rides did the car.. man that thing was gorgeous.. was driving around 700 horse with that one. that thing sounded mean, too hehe said with the EFI and tweaks, he'd get around 10MPG out of it, with a 13 gallon tank.. heh car was built for that host of 'fear factor' I guess. Personally I don't watch reality shows.
Saw that one. Yep, Joe Rogan was the happy customer on that deal. He got a tad excited when driving Troys cars. I'd love to get that Mustang back, but the ~8 mpg I was getting wasn't pretty, of course back then gas was under 80 something cents a gallon. Mine wasn't the all out street brawler, it had the power, I just should have spent more money on the tranny, gearing, and chassis. Had a plain out nasty idle to it, though, and could rev around 7,000. I
heheh I'm still contemplating my final compression ratio. deciding between a conservative 11:1 and pump gas, or going to around 14:1 and running premium with tetra-ethyl lead (TEL) additive to boost it to about 106+ octane or so. I figure when I finish with the A727 torqueflite and the Dana 60 in back it should take anything the motor dishes out for abuse. those 727s are bulletproof if ya build 'em right. Only a 3 speed, but they're still popular for strip use.
I'm still debating the rear suspension though. I thought about a 4-link, but still pondering just using some traction bars on a beefed up version of what it's got now. I just need to lift the rear end a bit so I can squeeze the 315s under it and still clear the wells.
Yeah, 727s are strong as hell. I may look into a C6 with a Gear Vendors under/overdrive if I get the Fairlane, I've had sticks in most of the cars I've built, I'd like a change. Of course, Detroit Locker Ford 9" in the back. Gotta hold tradition. How big is the cam in that one? Mine were custom ground equivalent to the Comp Cams 305H, somewhere around 253 degrees at .50" lift. Nasty on that quart in a pint pot motor
looking at having a cam ground for it right now due to the 4.150 crank. gotta match the top end to the bottom end of that motor now.. messing with finding the right rod lengths and all that fun stuff. I'm looking at something past mild, but not quite on teh strip level for aggressive. I want it driveable.
I'm looking at throwing a TorSen rear end in that D60. should be sweet for hole shots, and still great in corners.. heh
I'm probably going to do a somewhat aggressive 351W, possibly stroked. Nothing too fancy, plenty enough to get me around fast. I guess 450 hp would be a good goal, not totally unaccomplishable on a street motor.
To who ever reads this: Above 130 db or even before that you will be wanting to tear your ears off from pain also you can lose your hearing temporally, and possibly not get it back. Even with less than 1 min at that loud can do serious damage to your hearing period! (Experts say prolonged exposure to sound greater then 90 db can cause hearing damage).
So "crank it up mother fu<kers" (Quote from "Adam Sandler - What The Hell Happened To Me" CD) , and play it safe use ear protection
theres one thing i find weird.... I hear ppl saying they hit around 140 dbs with 2 15''. If u go on the pioneer site, there is their pick-up, it has 6 FACKIN HUGE @SS subs, and they say they hit around 175 dbs... is this normal, or did i read wrong???
175dB is around the world record for SPL. it takes a lot of work and a lot of physics to attain those scores. every +3dB is about twice the power. every +10dB is twice the audible volume and ten times the power equiv.
I used to hit in the 151.x range consistently with my Festiva back when i competed using two 12" subs in a large vented enclosure, but there were plenty of people a lot louder, just not with as little power as I used. Remember decibels are a log base 10 scale, and not linear.
I'd prefer an SR-71 personally. enough thrust to drive a cruise liner. If you put the turbines of a blackbird on a 747, it'd literally melt the plane.. granted, a 747 doesn't have a titanium composite skin either though.
man I miss watching those things take off.. then go immediately to re-fuel in the air. hahahaha remidns me of my car.. punch the gas and launch.. to the next gas station to refill the tank.
I havent been tested yet but a friend i kno got 150 wut 2 10inch L7's and the guy told me mine is 10x deeper and louder I have A 15inch Mtx 9500 jl 1000/1 amp with the sledgehammer Mtx box ported
what mic did he do 150dB on? and old AC (that was messing up!)
oh, and the guy that said that your sub is 10x louder is a tard!
i have seen pairs of 12" L7's do 150, but 10's...only in a system that is TRULY geared toward SPL!!! and it would be hard to get the 10's to do that even if you know what your doing. X.X.X. 10's, yes. L7 10's, maybe!
oh and i saw the loudest street drivable car in the world at the nationals as well. He hit 171 db with like 8 15 inch memphis mojos and 16 ma audio core amps his front wall alone was 7 three quarter inch pieces of mdf lol. I know because i talked to the guy and he said go look because he blew one of the subs and was repairing the other which he said was good for like one more burp LOL. I went and looked and counted the sheets myself 1 2 3 4 5 6 7 i was like man. Oh and i said how do you do that spl without popping windshields? He grined and said oh i popped 11 already. (it was all in like an econoline van ugly too set up as a wall of course)
a competitor that comes to our shows does consistent 149's sealed on the dash with two L78's and one zapco 9.0 in a crx. yes sealed on the dash with an a/c, that is equivalent to a termlab outlaw(door open). thats loud
I've heard claims in the 180 range "unofficially" at events and such.. which translates to "couldn't repeat it" and "done on an old audiocontrol mic on a rainy day at sea level, and metered at the subs, not the dash"
but anyway, I'd be interested to know where that guy with the 180 got his vehicle metered, and if he has a slip to back up his claim.
I like the ones who claim a 200dB SPL.. I wonder what atmosphere that was in, because it sure as heck wasn't on earth.
sean, his box was ported. "sealed on the dash" means with all the doors closed and windows up and the mic on the front of the dash by the windsheild. "outlaw" means the mic is placed by the kick panel and you may open doors or windows. in most all vehicles you will gain at least 3db or so by opening a door. think of your entire car as a big bandpass enclosure. also since the a/c mic is like 3db looser than the t/l his score is equal to that of a t/l's because his car was sealed. 149 with 2L78's
In our atmosphere, the loudest man made sounds are nuclear explosions and the Saturn V launch. The loudest sound known of in history was the explosion of the Krakatoa volcano in Indonesia, the volcano had a series of eruptions, and after one of them, lava cooled in the conduit, sealing the volcano. It tried to erupt but remained sealed and built of huge amounts of pressure. Finally the volcano exploded, the sound from it was audible over 3000 miles away. Barometric readings were screwed up all around the world because of the infrasonic sound waves the volcano sent through the air. Doubt any SPL competitor could do THAT
hehe 200dB is about the limit, such as a shuttle launch, but the only reason this event, and most of the ones you mentioned can reach 200dB, is due to changing the surrounding atmosphere via the gases created around the event. example being the hydrogen fuel used in a shutle launch.. this alters the makeup of the atmosphere allowing things to work a bit differently than they otherwise would for things like sound pressure.
anyway, on competing, when I was in IASCA circuits, it was pretty much always windows up, at the dash for metering. heh if you want to have fun though, you vent the trunk of the car underneath in areas like the spare tire well. This couples the cabin air with the outside air, and essentially does the same thing as having your windows down. This is done for some enclosure types too, like an AP box in a hatchback. only way to pull it off since each side of the box has to have separate airspace.
Yeah, know what you mean about Atmospheric pressure. They say underwater earthquakes can top 270db. I'd like to know how loud that volcano was, though, but it was in the 1800s and the tidal waves caused by it killed 30,000+ people on nearby shores, so I doubt there were a lot of witnesses to say "Yeah, it was loud", plus they didn't have the new Termlabs sensor back then .