7 replies to this topic

[asylum_83]

well, basically what i did, was sit the dB meter on the console lid, pointing towards the centre of the dash (5" mounted in door, tweeter in a-piller) seemed like a good centre point. All the EQ settings were turned to flat, and i went through these frequencies on a test CD and dotted down what reading they gave, which came up as this chart:



from there i went back to the tracks that had a low or a peak, and used the EQ to even it out as much as i could. the sub bass is still above most of the rest, but i think it sounds better like that, and a lot of recordings need that bit of a boost.

have i done this correctly? the speakers are faded slightly left, (sounds right doesnt it, so the sound should seem more in front of me, not the middle of the car?) and mainly front. The time alignment is pretty much spot on, and it all seems to have made small improvements.

Any hints anyone else could give me? i'm trying to get it as perfect as i can.

thanks!

[KDog]

Well Yes and No,
We need to know a lot more info before we can accurately give you an answer.
1. Is your microphone and dB meter matched to give a flat frequency response? You have to make sure your measuring system has a flat response before you try and measure with it. A tleast know where it is off so you can compensate for it yourself when you interpret your results.

2. You need to do several measurements in different areas and then average the results. This will make sure you are not picking up any gains/cancellations which may be specific to that one spot for that frequency in the car. Have all processing and TA set to 0 during this stage.

3. You are not aiming for a flat response, if you have one it will sound terrible. You bass should be louder then the rest, the high end might also be too loud for your liking as well.

[shiny_car]

OMFG. KDog resurfaces!

hurrah!

[Dogo]

the centre image should be the centre of the dash

read more :
http://www.caraudioaustralia.com/forums/in...showtopic=64725

you've got the right idea - but like KDog says there are a few things to take into consideration.

Maybe use the new EQ settings as a base point and adjust a bit by ear

[Pulse-R]

I do it by testing the EQ at the driver's seat at head height, and the passenger's seat at head height, then average the adjustments for a happy medium.

also, yes, move the meter around a bit to check for nulls or peaks in any given spot.

remmeber, you have two ears which average the sound, and there is only one mic. in the dB meter.

centre image is the middle of the dash, and it shouldn't move as the frequency goes up/down.

hint also: check the left and right speakers independently of each other.

[KDog]

shiny_car, on Apr 19 2006, 06:05 AM, said:

OMFG. KDog resurfaces!

hurrah!

lol,
thanks shiny. its been a long time between drinks.

[ProClass]

It is true that the human body has two ears but it does not average what each ear hears.
The brain creates the "image" of sound from the time differences between left ear hearing sound and the right ear hearing sound. Thats why we can tell where sound comes from. This is provided that the note you hear has a wave lenght shorter than 4 times the distance between your ear drums. Or roughly 300 Hz. There is no such thing as stereo image below 300Hz. It just can't happen.

[s_tim_ulate]

Your ears and brain can easily distinguish frequencies below 300Hz. Was 300 a typo, maybe you meant 30?

Anyway your brain locates sound through a combination of many things, including, time differences, amplitude differences, the refractive signature of the wave around your head and in your ears. This is dependent on the frequency of the wave itself as to how the brain localises it.

Generally for car audio purposes 50-80 hz is a nice spot to assume we can't hear any stereo effect and is a good spot to have your fronts play down to/your sub come in.

But the lower the better.

Edited by s_tim_ulate, 28 April 2006 - 11:25 PM.