Max SPL volume possible.

[CBFryman2 5,000+ posts]

Loudest on the AC is 180.X IIRC.

as far as I know the term lab has not been maxed out.

 

[DBfan187 5,000+ posts]

180.3

 

[xluben 10+ year member]

the pioneer truck topped 180. is that on the TL?

i was trying to look on their site, but now they have a stupid elevator animation and i can't find anything //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[ngsm13 5,000+ posts]

So I was googling around trying to find out what is the loudest that car audio could go and I found it! 194 db.

At approximately 194dB, the sound pressure would have to change more than the ambient air pressure. At this point, the sound wave would have to create a negative air pressure to get any louder than this. Since that cannot happen air itself distorts sound by “clipping” the sound wave. This is also known as a sonic boom.

I figured I’d do a little numerical investigation to see what the max pressure corresponding to 194 dB is. I fired up MathCAD and started plugging away.

Pref = 20E-6 Pa

SPL = 194

P = Pref * 10^(SPL/20)

P = 1.002E5 or ~100kPa. ie atmospheric pressure

At 194 dB, sound pressure doubles atmospheric pressure in the compression stage, which requires a vacuum in the rarefaction stage.

That’s loud

nG

 

[tommyk90 5,000+ posts]

180.3

During a demo run at MECA finals last year, scott owens (the pioneer F250) put the sensor in the kick and did a 180.9 on the termlab. //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif

 

[reneeb7363 10+ year member]

lawl.... thank gawd for Google!

 

[Pl8er 5,000+ posts]

So I was googling around trying to find out what is the loudest that car audio could go and I found it! 194 db.
At approximately 194dB, the sound pressure would have to change more than the ambient air pressure. At this point, the sound wave would have to create a negative air pressure to get any louder than this. Since that cannot happen air itself distorts sound by “clipping” the sound wave. This is also known as a sonic boom.

I figured I’d do a little numerical investigation to see what the max pressure corresponding to 194 dB is. I fired up MathCAD and started plugging away.

Pref = 20E-6 Pa

SPL = 194

P = Pref * 10^(SPL/20)

P = 1.002E5 or ~100kPa. ie atmospheric pressure

At 194 dB, sound pressure doubles atmospheric pressure in the compression stage, which requires a vacuum in the rarefaction stage.

That’s loud

nG

Impressive! I've seen this somewhere before. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

Honestly though, if you would have written that as the first post none of the negative comments would have ever happened I have to get some street credit on here //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Pl8er 5,000+ posts]

I'm curious what the limiting factor for SPL is right now. Is it technology isn't there or is it money? I mean if someone were to spend a million dollars on a tractor-trailer with all the power they could possibly need and the right setup, could they hit the absolute SPL mark? Or do subs and amps just not put out enough power yet to hit the mark?

 

[Chevyaudio 5,000+ posts]

Limiting factor is the knowlege to do it. It takes a ton of Knowledge and testing to reach a 160...let alone 180s. You can only get so loud by just throwing a ton of power at a ton of speakers...

 

[CBFryman2 5,000+ posts]

Impressive! I've seen this somewhere before. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif
Honestly though, if you would have written that as the first post none of the negative comments would have ever happened I have to get some street credit on here //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

No, I'd still make fun of noah for posting that.

 

[CBFryman2 5,000+ posts]

I'm curious what the limiting factor for SPL is right now. Is it technology isn't there or is it money? I mean if someone were to spend a million dollars on a tractor-trailer with all the power they could possibly need and the right setup, could they hit the absolute SPL mark? Or do subs and amps just not put out enough power yet to hit the mark?

Technology and the fact that most of the people doing it, though very intelegent, dont exactly know the mechanics of why it does what it does. You can throw tuner parts on a car all day long but if you dont know the mechanics of how the engine works to build one from the ground up you are going to hit a ceilg of fast eventually. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

SPL levels in the 180's are not all that hard (for a person which an 8 year degree in physics and acoustics and mechanical engineering), but these are created by mechanical transducers which are not allowed in dB Drag.

 

[Pl8er 5,000+ posts]

So with the million someone would/should spend about 100,000 on audio gear and supplies, 100,000 on a custom vehicle and then the remaining 800,000 on scientists.

Well I've learned something new today, so no matter what is said I don't think this post was in vain

Thanks for the input.

 

[CBFryman2 5,000+ posts]

I was just bustin your chops anyway man. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

But 80k wont get you much of a scientist/engineer. Plus, what is the fun in that? I think dB drag is right where it needs to be right now, in 10 years being decently compedetive in dB drag will be like the average skateboarding joe trying to win the X-Games...20 years and I wouldnt be surprised if there is a pro-only class (ie you must be sponsored). //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Pl8er 5,000+ posts]

I was just bustin your chops anyway man. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
But 80k wont get you much of a scientist/engineer. Plus, what is the fun in that? I think dB drag is right where it needs to be right now, in 10 years being decently compedetive in dB drag will be like the average skateboarding joe trying to win the X-Games...20 years and I wouldnt be surprised if there is a pro-only class (ie you must be sponsored). //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

Na, I knew you were messing...I just have dry humor I guess and I said 800K on scientists //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

SPL really isn't my thing. My whole post started because I am pissed at my subs because I think I have the crossovers set wrong and I can't get them to "hit" they move but don't sound great so I started looking at subs, then ended up at pioneers website, then saw the big truck then wondered what the highest it could go was

ADD is fun...look there goes a butterfly!

 

[Pl8er 5,000+ posts]

i love your sig. southpark ftw.

Aye //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Most people don't get it, they just think I'm crazy Thats such a funny episode.

"I don't want to play anymore and I'm going home"

LOL