ATi HDMI and calibration?

[oleost]

Hello.

Ive got an HTPC with and ATI grapichcard.
I use the HDMI out, both for audio and video.

I got built in sound card, with microphone in.

Is it possible to calibrate my sound card(ATi grapichcard) ?

Ive also have an SPL meeter (unknown brand) that Ive hocked up to my computer, and that is working.

[brucek]

I got built in sound card, with microphone in.

You require a line-in. Mic-in is not suitable.

Ive also have an SPL meeter (unknown brand)

You require a known brand with a calibration file, such as the Radio Shack or Galaxy meter.

Is it possible to calibrate my sound card(ATi grapichcard)

Yes, if it has a line-out and line-in.

brucek

[oleost]

Thank you for the answer.

On the sound card(grapich) I use I only got HDMI out, with both sound and picture.

But on my motherboard I got line in.

Is it possible to connect like this:

Ati grapich card HDMI out -> Reciever -> Preout speaker on the reciever(Left or right?) -> Line in (motherboard sound card)


Ok, Guess I have to buy Radioshack. Is what is the best one, analoge or digital?


PS, sorry for my bad english, its not my native language.

[brucek]

Is it possible to connect like this:
Ati grapich card HDMI out -> Reciever -> Preout speaker on the reciever(Left or right?) -> Line in (motherboard sound card)

Yes, if REW recognizes both the output and input you propose, and you are aware that you are assuming that the receivers line-in and preout are perfectly flat. If they are not you will introduce error into the soundcard calibration file.

People continually ask if digital-out is OK to use with REW. It's fine, except it can introduce errors at the extremes of the response depending on the quality of the D/A converter and line elements in the receiver used to 'pull off' this trick. The best method to use is a line-out and line-in.

I have to buy Radioshack. Is what is the best one, analoge or digital?

Doesn't matter really.

brucek

[oleost]

"Yes, if REW recognizes both the output and input you propose, and you are aware that you are assuming that the receivers line-in and preout are perfectly flat. If they are not you will introduce error into the soundcard calibration file."

Ok.

But I use an amplifier. (also reciever pre out, amplifier, speakers)

So if it isnt flat on the reciever, wouldt it just fix those errors aswell? It would be like calibrating the reciever to?

[brucek]

It would be like calibrating the reciever to?

Yes, and that is exactly what you don't want to do.

When measuring a device, the goal is to remove all the bias that the test equipment introduces. You don't want to remove the bias that the 'unit under test' offers or you defeat the purpose of testing.....

brucek

[oleost]

Hmm. I use my computer for music and seeing movies ?

But how does these graph look ?

[oleost]

I use my computer as HTPC, (playing music and movies with it)

Isnt it possible to apply the results of the soundcard calibration to the soundcard. (aka it alters the sound when I play music/videos trough a media center?)

[brucek]

But how does these graph look ?

What are we looking at?

Isnt it possible to apply the results of the soundcard calibration to the soundcard. (aka it alters the sound when I play music/videos trough a media center?)

Yes, do a search on convolver

brucek

[JohnM]

If you try and calibrate with a pre-out on the receiver you have to make sure the output is set as full range (or "large"), otherwise the receiver's bass management will alter the response by rolling off the low end at the sub crossover frequency (which looks like what has happened with your measurement).

[oleost]

Oh, yeah. I forgot that. Thank you.
I`l do a new calibration when I come home.

EDIT got home now.

It looked much better now
At 15hz it was only 0.5dB off.