Spl

[Mtspawn]

I want to know what people are hitting on SPL in your car?? I hit a 147 with 2 L7's and a 1000d Memphis amp

[quinton]

i hit 149.5 using my two concept 15's and a rockford fosgate 360.2.. i believe the mic was loose.. ill get back with ya after the 15th of sept when i have my jbl 1200.1 and a legit mic..

[qwik99gt]

Not to sound like a newbie, but how do you measure spl? I have a new system and was wondering if there was a cheap way to know how hard I'm thumping down the street:D . Sorry to interrupt but I figured you would know! Thanks!

[pounder]

i did a 165.5 on a really gay mic..totally bogus..on an accurate linear X i would be 150-155 db's..there are no accurate mics up here past 150 db's so im screwed..lets just say im over 150 :)

[Molson]

141.4 at about 85% power (having fuse problems)

Thats with 2 12" Alpine Type-R 2 DVC2Ohm (new that day)
and an Alpine MRV-T757

[Mtspawn]

What kinda boxes are you useing????

[Molson]

I am using a Cabin Pressure Professional. (ported)

[GrandAmSC/T]

Originally posted by Molson
141.4 at about 85% power (having fuse problems)

Thats with 2 12" Alpine Type-R 2 DVC2Ohm (new that day)
and an Alpine MRV-T757

Those Type-R's are pretty good. Dont sound too bad. I got a friend hitting a little over 150 db with 2 12" alpine Type-r's .

[Molson]

Ya, I imagine at full power with a little tweaking I should be able to get near there.

But the amp is getting tired. Every once and a while after working it real hard my car has a good odor of ozone.

[GrandAmSC/T]

Yep i dont see any reason why you wouldnt be near there. Hes been tweaking his for a while now, i think hes gone thru 3 boxes.

Not too sure what amp hes using but its pretty good sized. Ouch sounds like times getting close for a new amp.

[Molson]

oh ya, its been through its paces.. :) Just can't afford to get a new amp.. Cause when I do, it will be big. :thumbs:

[GrandAmSC/T]

Definately go all out on your next amp:thumbs: bigger is always better :) Good luck with your system man.

[AmIGrand]

I would like to know how you guy's are measuring these things. Doors open or closed? At the dash or where?

Not to be a prick, but some of those numbers are awefully high....

[Special Ross]

I hit 140 db with 1 JL 10W6 and a PPI 2240 amp. That was with the globe that USAC uses and the little microphone condom that takes a couple db away.


Michael

[blackgagt1]

I hit a 138.2 with 2 RF HX2s 10" and an RF bd500. All untuned.

I just got some new Solo baric L7s 12". I'll tell you when i'm done building the box. It will be great.

[Special Ross]

Originally posted by AmIGrand
I would like to know how you guy's are measuring these things. Doors open or closed? At the dash or where?

Not to be a prick, but some of those numbers are awefully high....

Well...I had my doors shut (windows up), the USAC judge placed the mic with the globe around it and the mic condom on it down in the right passenger footwell...basically under the dash.

Michael

[Molson]

Mine was doors shut, windows up, Mic was stuck to the windshield pointed toward where the dash and windsheild meet.

(IIASCA BTW)Or, Iasca style

[AmIGrand]

You two have somewhat believable #'s, although 140 is pretty high for a single 10w6. It's the high 140's and mid 150's I see claimed all over here that don't add up to me.

Not flaming anyone, just curious. 150 ANYTHING is incredible in a sedan with the subs in the trunk, no matter what they are.

[qwik99gt]

Ok, since no one bothered to explain this to me... I Macgyvered a spl measuring device myself out of a karaeoke machine, an ohm meter, some chicken wire, and two sticks of Doublemint gum. So far I have about 192.3 with 1 JL 10WO. That sound right? lol
Just figured I'd tease since no one would help me out... enjoy your thread, bassheads:wave:

[pounder]

Originally posted by AmIGrand
You two have somewhat believable #'s, although 140 is pretty high for a single 10w6. It's the high 140's and mid 150's I see claimed all over here that don't add up to me.

Not flaming anyone, just curious. 150 ANYTHING is incredible in a sedan with the subs in the trunk, no matter what they are.

yeah I agree with you amigrand..many say 150's isnt much for 4 12's..just shows how much they know really..the meter here is certified to 150, and is about as low as a linear X..so its not a forgiving meter..and when your tuned to 33 hz for spl..that makes for a really low burp..i topped out the meter at 150 db's with a 40 hz tone..which is very low..i need to get it on a meter that is certified above 150..I am guessing 153-154.. :wave:

[kcitsGT]

Originally posted by qwik99gt
Ok, since no one bothered to explain this to me... I Macgyvered a spl measuring device myself out of a karaeoke machine, an ohm meter, some chicken wire, and two sticks of Doublemint gum. So far I have about 192.3 with 1 JL 10WO. That sound right? lol
Just figured I'd tease since no one would help me out... enjoy your thread, bassheads:wave:

LOL I'll answer you. You CAN buy a meter if you want. If you have about $600 laying around. Radio shack has one for less than $50, but it only hits about 120 Db's. Best bet, find a stereo shop locally that will measure it for you. Try them on a slow day when they are bored out of their minds and will jump at the chance do do something. :D Plan on measuring mine after I finish my matting job. I'm hoping for low 140's. Good luck.

[XDRKMANX]

Originally posted by AmIGrand
I would like to know how you guy's are measuring these things. Doors open or closed? At the dash or where?

Not to be a prick, but some of those numbers are awefully high....


Thats two of us

[quinton]

Originally posted by AmIGrand
I would like to know how you guy's are measuring these things. Doors open or closed? At the dash or where?

Not to be a prick, but some of those numbers are awefully high....
I had my doors shut, windows up. mic was placed in front of dash, by vents.. seats folded down. subs firing backwards, invert mounted and in a 1.5 cuft per chamber sealed box.
http://www.grandamgt.com/forum/attachment.php?s=&postid=5084

[AmIGrand]

Must be something in the water. :lol:

Out here, I got guys with 4 15W3's and 3000 watts barely hittin' 152's, 2 15's in a port through and 2000 watts doin' 154's, most 2 to 4 12 systems are mid 140's.

Good job!

[qwik99gt]

Thanks for the info kcitsGT. I just don't respond well to being ignored. As for that $600 laying around, ummmm.... I spent it on some Legacy Red Subs and Pyramid 1000W amps. I now have 300 pretty subs and 150 shiny amps!!!!!!! And money left over for a PS2 and an Xbox! lol

[blackgagt1]

I just finished building my box for my solo baric i'll have pics very soon.

[XDRKMANX]

You finally got them.:thumbs:

[blackgagt1]

I hooked it up after free air break in. It slams like no other

[Haunz]

With my 2 12" MA audio XE's I was doing mid 120's with my POS jensen amp (only 400RMS) when I got my visonik it was more like low 140's at a safe power level, and high 140's when I cranked it...

Unfortunatly I have this tendancy to crank the **** for all it's worth... if smoke counted towards SPL those MA's would have had me in the 170's... :D

I plan on doing high 140's with the 2 15" subs I ordered ported at 20Hz with 1000RMS.... when I buy another amp I will be able to feed them 3000RMS (continuous rating) and I think I should be able to hit high 150's if I change the portes so they are tuned around 70 Hz..

(crazy peak in response according to winISD)

[ALPINE99GAGT]

I hit a whole whopping 132 db but I only have 100 watts going to subs and its a SQ system. this is at the dash with windows and doors shut. Its nice haveing my own meter

[mitro]

OK... I can't believe I'd admit to this... 122.5 using a radio shack SPL meter out of my Infinity Basslink :D I think I could hit 140s with just a little tweaking. Yeah right... :p

[Xtreme_99]

I hit 148.2 with
1 SA Xtreme 12" Dual 2
1 Memphis 1000d running at 1 ohm
ported box 3.3 cubes TOTAL
tuned to 40 Htz.

Still have to Tune it.

Xtreme

Edit.. I meant to type 1 ohm my bad it has been to long of a day!

[Mtspawn]

and how did you get it to .5 ohms with 1 sub???? thats more like 1ohm

[blackgagt1]

I just went to a Comp to day. I finished my box for my Solo-Barics

Same bd500. Hopefully with my new amp more!

I hit a 152.9 db:D :D

I took second and lost by .1 db i should have done a retry :mad:

But on the plus side i lost to a 99 GAGT blk coupe just like mine :D

[XDRKMANX]

Where was the comp at?

What did the other GA have?

[ryGT1]

Well, i'll step in and tell you what my sq system can do...

A large 118 db!!! With four 6.5" a/d/s subs off an Orion
Xtreme 800.4 And thats loud enough for me :thumbs:

[grass]

Originally posted by blackgagt1
I just went to a Comp to day. I finished my box for my Solo-Barics

Same bd500. Hopefully with my new amp more!

I hit a 152.9 db:D :D

I took second and lost by .1 db i should have done a retry :mad:

But on the plus side i lost to a 99 GAGT blk coupe just like mine :D

i'm guesssing since he lost to a GAGT, and he lost by .1, that the other GAGT had a 153.0 db

am i right?

[blackgagt1]

Originally posted by XDRKMANX
Where was the comp at?

What did the other GA have?

I was at Mobile-Tel Naperville. it was also a car show with a ton of Ricers :mad: One conv. GTO perf. condit. ohhhh ahhh



Originally posted by grass
i'm guesssing since he lost to a GAGT, and he lost by .1, that the other GAGT had a 153.0 db

am i right?

Yes you are correct!

I don't know what he had though.

Respectable score though from both of us.

[Skillet]

So I got bored over the weekend and decided that my 2 12" Bazooka DVC (4 ohm) just weren't kicking hard enough with just 760 rms ... about 130. So then I got off my ass and added the second amp to the system. Well I actually had to turn the amps down, cuz I was about to rattle my fillings out. I went to the local sound shop and bumped out at about 145-147. not bad. Now I need new rear deck speakers. Blew one. sooo ****ed so ****ed.

[grass]

dont use rear ones, i had mine in and i could barely hear em over my subs, so when my subs blew up the pressure in the trunk it messed my rears up bad, so i took em out, sounds the same to me

[blackgagt1]

I have no real fill

I will be getting Focal component set.

Besides people sing to you it only makes sense to not have any rear speakers

[grass]

blackgagt1 dont you have solo barics? if so got pics? i wanna see your setup

[GTkid]

i havent been tested or whatever but what do you think 2 12" Perfects at like 300 watts to both would get? anything?

[grass]

ported or sealed?

[grass]

sealed i'm guessing bout 135-140, ported maybe 138-142ish. just a guess though

[blackgagt1]

I'll get my digital camera back from work and i'll take some pics.

I have to warn you i haven't capeted the box and it takes up the entire trunk :(

A 153 is all worth it though

[grass]

so is it ported? do u have 2 subs?

i have an L5 in a ported and an old L7 also in a ported, my trunk is gone too :)

but its worth it to shake my eyeballs

[Treviathon]

I hit a 131.3 db with 2-10 inch MTX T61044A (dual voice coil) running a Thunder4202 (280W RMS bridged into a 4 ohm load, 140WRMS per sub, 70WRMS per voice coil), with a sealed enclosure of about 1 cubic foot per sub, each sub seperated in the enclosure. It is more setup for SQ, but unfortunately I haven't had that tested yet.

[XDRKMANX]

You guys heard of www.reaudio.com ?

And their subs?

[MattBatt]

Just for a little reality check you start to do permanent hearing damage at around 120 dB. 150 dB is louder than a rock concert a jet and is about the same as a gunshot with the muzzle right next to your ear. I really hope you guys are using protection of some kind.

Ok off my soap box now

I got a bazooka 4Ohm 12 in sub in a 2ft cu-in ported box that is tuned to 30 hz and being powerd by a bridged Ample a410 delivering 150W RMS and damn I wanna test it.

[AmIGrand]

The human ear is not uniformly sensitive across the audio spectrum. 120 db below 100 Hz is not gonna do much to your hearing, 120 Db at 4 Kz.... Well, it's not fun. Permanent damage from bass starts at about 140, things don't get IMMEDIATLEY threatening 'till 150. Anyone who has a system capable of 150 doesn't drive around at that volume all the time, I promise - it's physically painful!! Not just your ears, but EVERYTHING hurts at that point.

[blackgagt1]

I don't drive with it at full blast much but when i do it hurts.

Iamgrand is right

[grass]

hehe blackgagt1 switched amigrands name around to make himself sound grand, god i'm so tired

how much do standard shops charge for a DB test?

[pounder]

Originally posted by ryGT1
Well, i'll step in and tell you what my sq system can do...

A large 118 db!!! With four 6.5" a/d/s subs off an Orion
Xtreme 800.4 And thats loud enough for me :thumbs:

cool man respectable for 4 6's..are you thinking of competing iasca? cus you have to do minimum 130 or 135 not too sure.. to compete..not sure about usac or meca..nice install man

[quinton]

Originally posted by grass
hehe blackgagt1 switched amigrands name around to make himself sound grand, god i'm so tired

how much do standard shops charge for a DB test?


$15-30

[MattBatt]

Originally posted by AmIGrand
The human ear is not uniformly sensitive across the audio spectrum. 120 db below 100 Hz is not gonna do much to your hearing, 120 Db at 4 Kz.... Well, it's not fun. Permanent damage from bass starts at about 140, things don't get IMMEDIATLEY threatening 'till 150. Anyone who has a system capable of 150 doesn't drive around at that volume all the time, I promise - it's physically painful!! Not just your ears, but EVERYTHING hurts at that point.

Thank you for correcting me I forgot about that.

[ryGT1]

A bunch of hifi guys have told me to go into the sq competition...
but I really dont have any kind of interest in it. Next year I plan
on putting these four subs up front in the kicks, and putting
an a/d/s single 12 in the trunk... but I really might not do that,
I'm really happy with how this system turned out, and I should
get some pics of my new amp up there.

Thanks!!! :thumbs:

[AmIGrand]

cool man respectable for 4 6's..are you thinking of competing iasca? cus you have to do minimum 130 or 135 not too sure.. to compete..not sure about usac or meca..nice install man

For SQ competition, there is no minimum you have to hit, but you will lose points. For the SPL part of the regular SQ competition, you are awarded 1 point for every Db over 100, with a maximum of 30 points. Anything you hit over 130 only helps your score for SQ+ or SPL competition.

[Skillet]

I don't drive around with it going fulll blast, rattles the hell out of my deck. don't like that.

[pounder]

Originally posted by AmIGrand


For SQ competition, there is no minimum you have to hit, but you will lose points. For the SPL part of the regular SQ competition, you are awarded 1 point for every Db over 100, with a maximum of 30 points. Anything you hit over 130 only helps your score for SQ+ or SPL competition.

you sure thats iasca? ill check my buddy's rule book when i see him..but i was sure you had to hit 130 to qualify..

[AmIGrand]

Ypu must hit 130 to qualify for SQ+ or all-out SPL. There is no minimum for just the SQ portion that I have ever been aware of.

[digiblur]

Not sure what DB I've hit but... running 2 12's on a 1ohm load. Probably hitting about 300 on each 12. If I crank that bad boy up my CD starts skipping all while the radar detector on the windshield is dancing. Funny as hell... :)

[blackgagt1]

Most shops charge about $20

Most of the time $10 if you are not going to compete nationally.

Originally posted by digiblur
Not sure what DB I've hit but... running 2 12's on a 1ohm load. Probably hitting about 300 on each 12. If I crank that bad boy up my CD starts skipping all while the radar detector on the windshield is dancing. Funny as hell... :)

Mine is that same way except my CD doesn't skip well thats because I bought an Alpine they never skip. They use a different type of system to make it so that they don't skip. Unlike Sony they use a shock system.

Sony uses a buffer

[Tankengine]

hey guys, i really want to find out how many db im hitting, my friends tell me at least 150, but i dont know till i get it tested, i live in toronto where would a good place to get my stuff tested be? i got a

JL W7 10"
JL 500/1
Pioneer 840 deck

[Tankengine]

this is the amp

[grass]

peoples ears arent a good sense of DB, you need it metered, they maybe close with the setup you got though.

go to the place where you bought your stuff

[blackgagt1]

My friend has the same setup except that he has a ported box that will get you a better SPL.

I'm hitting 153s. He is no where near me!

I would say you are hitting around 140 with that Tweeter sealed box.

[grass]

you went and got yours tested blackgagt1?

i'm still waiting on your pics hehe
heres mine

http://members.sounddomain.com/grass1982

[AmIGrand]

JL has an Eclipse with 2 10W7's in sealed boxes with a 500/1 to each (2 amps) hitting 152's, so I doubt you're in the 150's with a single sub in that car. The W7 is an awesome woofer to be sure, but somewhere about 139 to 142 is what I'd expect t see there if the system is set up right. You know you're nearing 150 when you can't stand to be in the vehicle while it's cranked. :D

That's pretty loud for a single 10 in a sealed box, though - enjoy!

[blackgagt1]

Yeah i got mine tested on the 6th.

I will get pics when the dig. cam. is done at work or when i buy one tomorrow when i get my paycheck. :D :D

Partical Board?? Grass

[GranDamn]

i hit 207 with my jensen 6X9s powered my a stock head unit preamp.

[blackgagt1]

What were you under water?

The highest posible score in theory. Is 198 i believe that is with an explosive of some kind

[GranDamn]

sike.... i have two 15s powered by a kenwood 600. i have no idea what it hits in spl. but for 600 watts, it pounds its ass off. probably in the 120s.

[quinton]

i'd cry if you were in the 120's

[grass]

my boxes are made of MDF

i too hope your over 120db's heres some other things in DB form

Near total silence - 0 dB
A whisper - 15 dB
Normal conversation - 60 dB
A lawnmower - 90 dB
A car horn - 110 dB
A rock concert or a jet engine - 120 dB
A gunshot or firecracker - 140 dB

[blackgagt1]

It looked like fiberboard. From the picture.

What were the other levels in the Kicker book? Grass?

[grass]

my boxes are Fiberboard, Medium Density Fiberboard (or MDF)

i didnt get those decibel's from the kicker book, i found em online, i'll check my kicker book if i can find it

[blackgagt1]

I didn't look like MDF for some reason. It looked like a lower grade. Like anyone would buy any lower for a sub box?!?

It was the Kicker tech tips i got it at there website.

Whisper------------------- 30db
Normal Conversation--- 60db
Beltsander---------------- 93db
Handdrill------------------- 98db
Imapct Wrench----------- 103db
Ambulance Siren--------- 120db
Jet Engine at Takeoff--- 140db
12 Gauge Shotgun------ 165db
Rocket Launcher--------- 180db
Loudest Possible Noise- 194db

[grass]

i wonder what the loudest possible noise is?

[Tankengine]

Originally posted by blackgagt1
My friend has the same setup except that he has a ported box that will get you a better SPL.

I'm hitting 153s. He is no where near me!

I would say you are hitting around 140 with that Tweeter sealed box.

hey blackgagt1, do you think my box is sealed? its not! right above the sub, there is an opening from the left side to the right side, its about 2 finger's thick, like 1 inch or so, not to sure, and i am going to get it tested next week!

[kcitsGT]

Originally posted by grass
i wonder what the loudest possible noise is?

That would be the high pitched scream of a ricer when a GAGT flys by him! :D

[blackgagt1]

Originally posted by grass
i wonder what the loudest possible noise is?

I was told that it would be an explosive of some kind.

Originally posted by Tankengine


hey blackgagt1, do you think my box is sealed? its not! right above the sub, there is an opening from the left side to the right side, its about 2 finger's thick, like 1 inch or so, not to sure, and i am going to get it tested next week!

I thought that it was sealed. if it's ported i'd still say low 140s

[AmIGrand]

Above 194 Db, it's no longer a soundwave, it's a shockwave. At that level the air becomes solid....

Space shuttle launch, at the launchpad - 180 Db
Small hydrogen bomb at ground zero - approx. 215 Db (not a joke).

Remember - SPL is a measurement of pressure, and can be extrapolated from energy transfer, etc.... So while I doubt they had a mic there, they know what the shockwave was doing. :D

[quinton]

Originally posted by Tankengine


hey blackgagt1, do you think my box is sealed? its not! right above the sub, there is an opening from the left side to the right side, its about 2 finger's thick, like 1 inch or so, not to sure, and i am going to get it tested next week!

uh i hope its not just a 1 inch hole cut out of the board....

[grass]

its a vent sloted box, i've seen em in the store

[MagiLLa]

i thought our atmosphere was only capable of holding 184dB ?

[quinton]

yeah i know what slotted vent boxes are.. but a 1 inch hole sounds kinda small.. assuming he means 1 inch by 1 inch.. still sounds small even if thats only one dimension..

[grass]

the one i saw at the store was 1 " vent all the way across the top of the box