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post #1 of 37 Old 03-12-07, 05:51 AM Thread Starter
 
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calibration confusion!

OK, I have tried this several times and had problems with my sound card - possibly conflicting with my on-board sound. However, I think I am getting there.

I get to the check calibration part and it produces a graph like this:


This doesn't look like the samples! Is it clear from this where I might be going wrong.

Thanks for any help.

Graham
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post #2 of 37 Old 03-12-07, 06:17 AM
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Re: calibration confusion!

I'm sure brucek will be along in a minute.

Last edited by Chrisbee; 03-12-07 at 10:27 AM. Reason: delete
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post #3 of 37 Old 03-12-07, 10:04 AM
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Re: calibration confusion!

You're having a bit of trouble with the soundcard calibration file. For the areas of interest which are below 500Hz, the soundcard.cal file is OK, but the card is showing oscillation after that. The loopback measured response simply validates that the soundcard.cal file is not good after ~500Hz.

This is usually caused by choosing an Input Volume setting that is too high, even though REW says the headroom is OK, the fact is it's not OK at the higher frequencies. Set the sweep level to -12db and then select a lower Input Level setting and it will stop oscillating at the higher frequency. Do successive tests until you find the best level with no ringing.......

brucek
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post #4 of 37 Old 03-12-07, 09:20 PM
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Re: calibration confusion!

You can also get responses like that if some kind of sound effect is turned on.
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post #5 of 37 Old 03-13-07, 02:55 AM Thread Starter
 
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Re: calibration confusion!

I am fairly confident that no sound effects are turned on, but will make sure they are definitely off. I will also try lowering the volume. Thanks for the suggestions. Just need the time to give it a go.

Graham
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post #6 of 37 Old 03-14-07, 02:38 AM Thread Starter
 
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Re: calibration confusion!

I still have had no luck in getting this to work, however, I have had the suggestion that using the windows mixer may be more successful.

The computer is a Dell and is running Windows XP. It has an on-board sound. I have added a pci card to give me the required input/outputs, but the software it comes with is very basic - and seems to be causing issues.

I have looked and looked, but can't seem to find the windows mixer. Would it be available with on-board sound? I would appreciate any help in getting the software on my machine - if it isn't already.

I know my way round macs, but am new to pc's, so assume zero knowledge.

Thanks all - I'm itching to get my BFD to do something useful!

Graham
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post #7 of 37 Old 03-14-07, 08:29 AM
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Re: calibration confusion!

You need to first disable the on-board sound in BIOS.

Usually once Windows sees a new device in a computer it will load drivers for it that are found in Windows (unless it's an unusual type, then its own software drivers would need to be loaded).

The Mixer can be accessed by double clicking on the little volume control speaker icon in the system tray (bottom right hand corner of the windows screen).

If the little speaker isn't there, put it there by clicking Start button / Control Panel / Sound and Audio Devices and check the box.

The mixer can show either playback or record features by selecting options / properties of the mixer.

brucek
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post #8 of 37 Old 03-14-07, 09:28 AM Thread Starter
 
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Re: calibration confusion!

So many thanks to Brucek and Malice (beyond the call of duty!).

But sadly... I still have issues.

I disabled the onboard sound in BIOS - what an adventure! Also I got the sound card to use the system mixer and have the sound on the dashboard (is that what it's called?). So, set it all up and I get this graph from REW.



Is this card just junk. This is just too much work and I have nothing to show for it. Again, your patience and expert help is much appreciated. Am I flogging a dead horse with this card though?

Graham
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post #9 of 37 Old 03-14-07, 12:05 PM
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Re: calibration confusion!

Graham,

Most cards work without any probelms, so, A few questions.

Can you tell me what type and model of soundcard you're using?

Did you load its software package or are you using the embedded Windows XP software to operate it?

Are you using line-in and line-out of the soundcard with stereo adaptors and looping one channel (i.e. right channel)?

Can you post the mixer settings for both record and playback like shown below? and if you are using the soundcards software, please post a picture of its settings...

PLAYBACK
Name:  playback.jpg
Views: 276
Size:  32.0 KB

RECORD
Name:  record.jpg
Views: 265
Size:  24.2 KB

brucek
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post #10 of 37 Old 03-14-07, 04:36 PM Thread Starter
 
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Re: calibration confusion!

OK, sorry for the delay. I have to drag the pc back to the other end of the flat, so I can hook it up to the internet and get the files onto the mac, where I am much more comfortable.

This is the card I bought.
http://tinyurl.com/2k35bf

I did load the software 'package'. At first it didn't seem to show anything, so I disabled the onboard sound (it's a dell dimension 3000). Then it took. It's just a simple sound mixer, but I don't really understand how it works as there is no explanation. Now I have disabled the onboard sound via bios. Selected the soundcard in the sounds control panel and it seems to work. I still have the old mixer down at the bottom right hand side. I am now using xp to control the volume.

I have set the sound card to use stereo and only one jack puts out sound. I use that for the line out. The line in one is the only one that seems to work, so I am guessing is the right one! I am looping using a stereo adapters to phono lead.

Here are the pics as requested.







Hope I have made a school boy error and it can be sorted simply.

Thanks once again.

Graham
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