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Old 19th February 2007, 02:18 PM   #1
ch83575 is offline ch83575  United States
diyAudio Member
Join Date: Jan 2005
Location: Michigan
Default Help with soundcard... please!!

Ok... this has been hapening for a while. I am using the Delta 410 soundcard and I am having a very frustrating problem. I go to take a measurement and all I get is a FR graph that looks like a steep incline starting at 1000 hz at 0db and going up to maybe 40 db at 20k. All of my measurements basically look superimposed on this incline. If I measure a woofer it might not even show up because it is like the soundcard doesn't even read anything lower than the 1000hz. I started unpluging things in what I thought was a systematic mannor and monitoring what happens in real-time with arta's 2-channel frequency responce, but at one point I thought it was my mic preamp, then I thought it was my referance probe to my amp, then I thought it was the amp. The only thing I can do that totaly stops the problem every time is if I unplug the entire rca harness from the soundcard. Then everything goes flat. Even if I have nothing pluged in at all it will still look like the sloping responce, then I unplug the harness and all goes back to flat.

Here is a graph of the soundcard recording 1-channel FR without anthing pluged in at all:
Click the image to open in full size.

Hopefully sombody has some idea of what is going on.
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Old 19th February 2007, 02:47 PM   #2
Svein_B is offline Svein_B  Norway
diyAudio Member
Join Date: Oct 2005
The left axis on that graph looks very strange. I get a similar curve, but at around -90 dB. You have +60.

Have you checked the Windows volume control, and made sure that the mic and line are muted for the playback mixer?

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