anyone know the transfer function of a lancer. or an evo. just wondering

 

I don't know.

 

I don't know either.

 

Get yourself one of the el-cheapo RS meters and figure it out.

I don't mean to sound like a dick, but transfer functions are pretty closely guarded competition secrets. (depending on where you're from/go) Can't just bust in and ask, expecting to get an answer.

 

sorry if i sound like an idiot, but whats a transfer function?

 

Transfer Function is the natural boost in low frequencies caused by the acoustical properties of a vehicle's interior, sometimes it's called cabin gain. Basically it's the note where the bass is the loudest in a given car.
And that's also why people aren't overly forthcoming with this information most of the time. It takes a fair amount of time to find it.

I'll tell ya this though... it's between 30 and 45hz.

 

hm, interesting, and where would one find one of these RS meters? radio shack type place?

 

RS actually stood for Radio Shack... you're looking for a SPL meter. I must have forgotten which board i'm on when I typed that. Everyone on my audio boards knows of the cheap radio shack SPL meter.
(and upon checking, there are apparently 2 options now)

Analog: http://www.radioshack.com/product.as...5Fid=33%2D2050

and what seems to be well worth the little bit of extra money

Digital: http://www.radioshack.com/product.as...5Fid=33%2D2055

Now these aren't gonna give you competition numbers, nor will they meter most serious systems. BUT they can be quite handy when coupled with a CD full of test tones for finding peaks and valleys in reponse, and also for finding transfer functions. (be sure to wear some ear protection when seeking out your transfer function)

 

alright, so basically throw in a bass check or something, and play with the Hz level until you find the one that provides the highest reading? hm, this could come in very handy...

 

That's the procedure.

With such a small SPL meter you won't be able to fully crank out your system (mics have a rolloff near their top end where they're not so accurate) but if you do it at a moderate level and just pay attention to where in the sweep the peak is, the peak won't change. The loudest note at 3/4 volume is gonna be the loudest note at full blast.

 

I'm sorry, as interesting as that all sounded, you might as well written in French! And I thought I wanted to put a system in MY EVO...*think I'm in trouble*

 

If you're just looking to make a system, you don't need to know any of what we're talking about. Transfer function is useful information, but not required for a system that just sounds good. It's more competition knowledge.

If you're looking for ideas or suggestions about what to put in your EVO, either post a new thread, or check out the one Vanilla Sky had up a while ago.

 

that's funny, cuz when I went and got the meter, I found that the higher the frequency, the the higher the reading. it's loudest when the low pass is cranked all the way up, which I do believe it 150 Hz...did I do something wrong or is my car just weird?

 

Well, no one's mentioned the quality of the meter and how it reacts to different frequencies, but that could be your problem. Just like speakers and other acoustic equipment properties, nothing is flat. Everything has a transfer function of some sort, so to speak.

That includes the microphone on your meter and no microphones are going to respond as well to low frequencies as high unless they are specifically designed for it. Take a look around a mic'd stage sometime and you'll see all sorts of mics used for vocals, guitar amps, bass drums, etc. You pick mics that respond well to the frequency range they will be hearing.

In your case, it's wholly possible that the mic on your meter just doesn't pick up lower sounds as well, since that's the most difficult. And also a mic that responds well to low frequencies is most likely going to be pretty horrible through most of the spectrum from lik 1Kand up. Mics that are mostly flat through most of the audible spectrum cost hundreds of dollars.
-N

 

would the transfer function also be the reason why when you roll down the back windows you get an oscillating bass sound, without a system.

I have noticed this since I bought the car but no one at Mitsu could tell me what it was except for a rare wind noise.

but it does sound like it is around 30 hz, to test this the front windows must be up and the rear down. Afterall I know I cant be the only one hearing this sound of "transfer Function"