Help understanding RTA weights

[jcarv...@gmail.com]

Sorry this is a newbie question lol.  I did try to use google to answer this.  I need help understanding the weighting.  Heres what I got so far.

Flat =  measure of db with no curve for how it "sounds" vs the pressure it generates.

A Weight = Shows how it "sounds" vs how it meters.  Is this correct?

C Weight = No idea couldnt find anything

X Weight = Something related to movies but thats all I could gather

Is A weight what i would want to use to eq a system to sound flat? 

Thanks again!

[Myles Dexter]

Weighting is a frequency dependent filter applied to your data. A and C weighting are pretty well documented out there. X curve is a new feature Julian implemented, which allows you to make your own filter shape (pretty darned cool of Julian to have done this, per the request of another customer).

Here's a wiki on weighting you'll find useful. The pic shows the shapes of the filters you are asking about.

http://en.m.wikipedia.org/wiki/A-weighting

Relative to the eq question, that's one way to think of it. Your system will be limited on the low end though, so you'll most likely have to make a compromise there.

- Myles

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[jcarv...@gmail.com]

Got it, after reading a little further on that wiki page as well as some others one thing I found in common was that A weighting is used at low volumes and B weighting is the most commonly accepted curve for music.  Do you know why B wouldnt be an option?  Sense the x curve is user programmable would i make that a B curve or is it more of a graphical eq adjustment? Where do I go to define the x curve? 

Also your last comment about lacking in the low frequency range, what did you mean by that?

James 

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[Myles Dexter]

Sorry. I misspoke earlier. X curve is not as I described it. See the link below for more details.

https://sites.google.com/site/bofinit/audiotool#TOC-Weighting

Relative to my low end frequency comment, I was referring to your hardware setup (amp, speakers, etc.). Of course, this might not be an issue for you, it was just a comment.

- Myles

[jcarv...@gmail.com]

Oh haha, yea I'm the last person in the world that low end is a problem for.  That's actually my area of expertise and I'm just starting to get my feat wet in the rest of the sound spectrum.