Wierd results when measuring soundcard response, need new S/Card??

[terry j]

Hi all, have spent the last few days reading reasonably conprehensively the posts on the forum. Don't want to waste peoples time without at least making the effort eh!

Strangely enough, in the post dated Aug 8th 2006 by Vaughan Odendaal, he describes exactly the point at which I'm stuck. (his post is at the top of page three of the forum.)

What is also very much of interest is that it is exactly the same soundcard that I'm using. At the top of page two of the post is the graph in question. Mine is pretty well the same, however my -3db points are 2.6hz and 5.544 khz. Additionally, the target RMS was-6.0 db and the actual RMS at 1 Khz was -6.0 db. Mentioned that because a later comment in the thread noted his results, presume it's valuable data.

Of course, what is annoying is that the thread just ends! aarghh

This soundcard is prob only a month old at the most, so would be mighty pee'd off if have to buy a new one ( will of course if neccessary). So, can any troubleshooting be done that will answer the question of whether or not I need a new card?

By the way, if I'm mucking up the procedure in any way, then I'd strongly suspect that it is in the computer skills area, eg the on;ly controls I can find for the soundcard is the normal windows one. So if someone were to suggest for example 'check that there is no effect switched on' I'd have no idea on where to find it!

thanks very much for your help, am quite excited and very much looking forward to using the program. Hope one day to be experienced enough with it to then be able to 'return the flow' and help others in the future.

Kind regards, and talk to you soon

terry

[brucek]

Perhaps tell us the type of soundcard you have and post your soundcard cal graph.... Is the soundcard cal the area where you are having the trouble?

brucek

[terry j]

Bruce, sorry, didn't mean to muck you around. Tried to ensure all the relevant data was included, however it meant going to another post, and in the end I didn't achieve what I set out to achieve! The soundcard is the same as Vaughans, a CMedia 8738. (I'm assuming its exactly the same, as c-media wave device comes up in mine exactly as it does in Vaughans post).

I'm pretty bloody slow when it comes to computers, so the thought of posting a picture gave me the willies! However, it is exactly the same as the picture posted on Vaughans post, with the changes being as noted. I will post this reply hoping that it speeds things up ( please find Vaughans post )http://www.hometheatershack.com/forums/bfd-rew-forum/1151-cant-get-work-2.html#post8644

I remembered tha there was a link button at the end of each post, I tried putting that in here, hope that is what all the writing is that suddenly appeared above!

Today, I will hunt around and find out how to post a screenshot, just wanted to send the reply off quickly.

Thanks a lot

terry

[brucek]

Today, I will hunt around and find out how to post a screenshot

Here's a step by step of how to post an image here at the Shack.

I read through the post you referenced and wonder if you have tried everything mentioned in that post. Specifically the cabling and stereo adapters of the loopback required for calibrating the soundcard and also the mixer settings.

brucek

[terry j]

bruce, pretty **** certain that everything is done and hooked up correctly as per the help files. As soon as I get to calibrate soundcard I get the results as on the posted link. Haven't had time yet to read the info on posting pics yet, we must be operating on different times at the mopment, can't get to serious reading for at least an hour or two. Can pop on quickly every now and then tho.

Also aked Vaughan if he solved the prob, hopefully he will log on and let us all in on how he fixed it!

the rsults change when I use 44.1 khz, the -3db points (on paper) seem ok at 2.7 hz and 19.9765 Khz ( up from 2.6 hz and 5.554 khz) but the actual plot looks still. Will post this answer quickly, and if you need to see the graphs still hopefully I'll have the info in that link sussed out by then.


lots of love

terry

[terry j]

this is a test upload of the graph at 44.1 khz



wow, that worked. thanks Bruce.

the graph for 48.1 looks identical, the only changes seem to be the -3 db point.

anyway, will send this off. Gotta keep reading to see how to get the whole page in, not just the graph.

[brucek]

To post a screen shot you first save a copy of your computer screen by pressing the key on your keyboard called 'PrtScr' (print screen).
Then open the Windows 'Paint' program (in Start/Accessories) and then 'Edit/ 'Paste' the screen shot to it. Then save as a jpg and post the jpg.

Perhaps post a picture of the settings that John mentioned in the other post.

[terry j]

hi guys, trying AGAIN!

Getting the data saved into paint no worries, but when I upload it takes for ever. Are they under the same size constraints as the other graphs?, and if so how do I set the image limit sizes.(assuming that could be the problem.)

Whilst I'm sorting this out, John, just to clarify, were you asking for the windows mixer panel?

Hope you guys are still on, we may have hit a common time window!

[terry j]

had a little look at things, the screen shot I saved has a size of over 1 meg, see from the attachment stuff that a jpg has a limit much less, so that is probably the problem. How do I edit the image to come in under the limit?

[terry j]

looks like I missed you guys for another night, oh well.

So I hope this post helps us home in on any probs we need to sort out.

For the life of me could not get my print screen to upload. As I say, think that is because the sheer size of the file is too large? If so, how do I 'tame' them?

Looking further in the help files than I've managed to progress, I see that very soon we end up using receivers for home theatre, of course my only interest is in 2 ch. So, are there any posts I need to be au fait with regarding using good old uncomplicated stereo and REW?

At the moment am using a 3 way set up, am seriously looking at integrating a sub with that. Even if I don't get around to that, bringing the bass totally under control is appealing. Spose I should mention my system is tri amped using the Behringer DCX 2496, so even if I don't end up using an additional sub then bringing the bass under control is a worthy goal.

Eventually will be replacing the Behringer with the DEQX, which can handle at three way, so hopefully using another of the Behringer products I can integrate a sub.

So for now, having the REW as room analysis , in conjunction with room treatment is where I'm heading. Catch you all another day, thanks for you interest so far