///M5

Almost. Frequency has to be the same. On top of all of the other factors your ears do NOT hear all frequencies with the same efficiency. There is even a switch based on intensity. The problem with the question is that there are a ton of factors. It just isn't super simple. There are many things that will make things sound differently.

Not that cap

First you need to study where you measured and what. Again a single number does NOT describe acoustics. If it feels louder are you measuring where you feel it? What frequency are you measuring and why do you think it pertains to any other frequencies that the system plays?

ROFL. Let's get naked and and spray ourselves with hoses.

If you take an American V8 and a Japanese I4 and put a mic at 50' away and measure them to the same dB level do they sound the same to the ear? No. i understand your point but i think its not the answer to his question. I know you understood, answer was for others. BTW, this is what I took as the actual question with relation to dB from the topic title.

fuck the numbers game, i'll take your 110 over Florida's 95 any day. I can't even walk to the car without my balls sticking to my legs, god forbid I should walk more than 1/4 mile because clammy skin = friction in all the wrong places. Same climate we have here. 95F, 65% humidity, feels like your skin is going to melt right off your face. 110F, 20% humidity? Sure, it's hot but at least your sweat can evaporate fairly quickly. We had two weeks of that too. Only two saving graces: a/c and the lake.

If you take an American V8 and a Japanese I4 and put a mic at 50' away and measure them to the same dB level do they sound the same to the ear?

or model something in WinISD and change stuff to see what happens. Not as insightful, but sometimes a picture is worth more than reading.

Sure, but now you are adding another variable and that is the box. I assumed above you meant in the same box. You can use the box to alter it as well. Good starting point on reading is to buy the LSDC by Vance Dickson

If all things are NOT truly the same, why does it meter the same. What is it that the mic is missing? There's my real question. Thanks for narrowing it down. You're awesome. Always simplify things, makes them more clear. All cars, all speakers, all boxes, all electronics, mechanics etc have their own signature on what they do acoustically or vibrationally when exposed to some sort of Kinetic energy. Mathematically it can be explained as a transfer function. ie, you ring a bell with a hammer and y lbs of force and at 1 ft it will ring this at x dB, in this case the bell resonates at a frequency and acts as a mechanical amplifier and then the structure moves around at that frequency and moves enough air to amplify the little energy you put into it. This resonation or amplification can occur in air as well as sound bounces off different objects in different defined spaces. You now have an acoustic response and structure borne noise changing the response and we haven't even spoken about the major differentiator in the box and driver, obviously these also follow the laws of Physics and can be understood in the same ways. Considering most people on here have dinked around with a box modeling software of some sort you can see what changing either t/s parameters or the box can have a drastic effect on the outcome so I won't go into that. ...but that is a little more complicated than saying if you keep everything the same and it meters the same it will be the same.

You do not meter the same. Frequency plays a major role, and yes even if you burp the same note and meter the same on that note, you do not meter the same. Hell, even if you did in one spot in your car and happen to find it, I would still say you do not meter the same. Your analogy leaves out some major considerations in frequency and mic location.

A dB is a dB. Let's simplify this a bit and remove the car. If you are in an anechoic (nothing to reflect off of) space and experience a perfectly pure (no distortion) xdB and it is generated by two different drivers, hell two different technologies or whatever it will not only sound but feel the same. Now change one of those parameters and your experience could differ, but if you measure x dB it is absolutely x dB*. *with the caveat that you use a true measurement microphone AND report the value with the uncertainty of the measurement system included (ie not a TL -- the TL will give you relative but repeatable just isn't absolute) In a reverberant space (ie your car - which has reflections) I would argue that you should measure and look for a peak around what you are using to determine it sounds different to see whose fooling who. Your car will not respond the same in all positions and will also vary with frequency. It will paint more of the story and help you understand your own question. But if you are asking if all things are truly the same will it sound and feel the same? You bet. In fact even if its within a couple dB's and everything else is truly the same it will sound a feel the same to you.

Showing what you know, nice. Blanket allegiance or anti-allegiance is just plain ignorant. i am. thats y im doing payments on them istead of spending all the cash i do have left on them. and my parents are letting me barrow the cash. and thanks for calling them retarded. i can tell im not wanted here..... You missed the point.

Why do you associate that with the 15's versus the 12? Where are you measuring the dB? If you are using your chest (or any part of your body for that matter) as a reference shouldn't you make sure they measure the same there? Also curious on your burp tone and what it is. You may be feeling things beyond what is being played or playing things you are feeling that aren't affecting the measurement.

You aren't comparing apples. By different dB's I mean they will measure differently which is where your difference is. As for peaking, Shizzon is describing the efficiency curve in the frequency domain. ie, each drive will have a different response so if you use the same song then by default the two different drivers will be playing different dB's. In other words, both Sean's are saying the same thing. Perhaps we don't understand your question. Some reading might help though. An acoustic dB is referenced to 20micro Pascals and therefore by default they ALL have to be the same. Do some reading on dB's and your question should be easier to put into words.

And it won't be ugly

OK, pair of 6x9's. I turn the volume up, play a song, they make bass. Disconnect the 6x9's turn subs on, same song, much lower volume than the 6x9's. I can FEEL the subs playing, something the 6x9's can't do. They made louder bass to my ear but the subs just sound so much heavier, more forceful. What I'm asking is why is that? Can something measure lower on a meter, but feel more intense, move more air, cause more flex? The 6x9 thing is just an example really. The way people say a 6x9 can never replace a sub is something I figured everybody could relate to. Different dB's and different frequencies. Exactly.

If you assume the same frequency and both dB's are referenced appropriately to 20microPascals then yes a dB is a dB. Your example does not relay that you are referring to the same frequency.

Just rip at 192 and all is good

you know whats a joke jl audio subs i seen so many w6/w7s blow. i blew 2 12w6v2s on a jl 1000.1 now thats joke when i can give my lil 180 dollar sub 1k and it takes it like a nothing but it guess thats a joke You obviously don't know what you are doing. Good job proving how incompetent you are. i know what im doing jl subs sound good thats it they cant take any power .im done with this bs ` That is a bit of an oxymoron. If you knew what you were doing they wouldn't have blown. Subs are stupid and only do what you have them do. More xmax = more air velocity in the port.

Familiar with both and have boated in AZ, still when its best

hell yes. Now you'll really be able to enjoy that boat for what it was made for. Good wake makes all the difference It was already enough for wakeboarding, just not surfing. Now it should do that too. If not another 400lb in the left locker will solve that, but I thought I'd add that in stages as I don't really want to add another pump and switch and wire and that bs. efffffff yewwwwww. I haven't been on a boat (except to fish... twice I think) all summer. You live in Texas Plenty of lakes and reservoirs here, just way too fucking hot to get out on the water this year That's when its best. Plenty, lol

you know whats a joke jl audio subs i seen so many w6/w7s blow. i blew 2 12w6v2s on a jl 1000.1 now thats joke when i can give my lil 180 dollar sub 1k and it takes it like a nothing but it guess thats a joke Blaming the sub for operator error is a big lol. Btw, the w6 wasn't designed for people like you, but even still it only blew because of you.

Ha me too

That clip always reminds me of animal from the muppets. And of course EVERY time I hear BR on the radio I now hear that version.