Help with E-mu soundcard and lousy crosstalk

nelsonvandal · 8th March 2009, 03:17 PM

I can't figure out how to configure PatchMix and/or my computer to get better crosstalk figures. I'm using Vista and E-mu 0404 PCI card. This is how it looks. It shouldn't be this bad, should it?

syn08 · 8th March 2009, 03:24 PM

Quote:

Originally posted by nelsonvandal
I can't figure out how to configure PatchMix and/or my computer to get better crosstalk figures. I'm using Vista and E-mu 0404 PCI card. This is how it looks. It shouldn't be this bad, should it?

PatchMix has a set of configurations specifically for RightMark. They are named RMAA. Give them a shot.

jcx · 8th March 2009, 03:36 PM

input or output crosstalk?

loopback testing can mix the 2 cases

did you use any termination on the input? - input shorting plug should give the ideal crosstalk

any impedance between out and in will form a voltage divider with input's loaded impedance

onboard analog switches likely would have parasitic coupling C

another issue can be signal current from heavy load on the output causing V drop in common ground impedance the soundcard

TRS stereo plugs can also be limiting because of the common ground contact resistance - load current on one output channel will couple to the "silent" channel through the gnd contact Vdrop

a independent signal source can help - a portable mp3 player can be good for this

nelsonvandal · 8th March 2009, 03:46 PM

This is loopback, no load. I'm using the RMAA default in PatchMix. 24 bit and 96 kHz. I have to go to work now, but please give me some ideas of what's wrong.

syn08 · 8th March 2009, 06:07 PM

Quote:

Originally posted by nelsonvandal
This is loopback, no load. I'm using the RMAA default in PatchMix. 24 bit and 96 kHz. I have to go to work now, but please give me some ideas of what's wrong.

So your EMU is working at 96KHz loopback? I thought the EMU drivers are allowing max 48KHz loopback?

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8th March 2009, 03:36 PM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	input or output crosstalk? loopback testing can mix the 2 cases did you use any termination on the input? - input shorting plug should give the ideal crosstalk any impedance between out and in will form a voltage divider with input's loaded impedance onboard analog switches likely would have parasitic coupling C another issue can be signal current from heavy load on the output causing V drop in common ground impedance the soundcard TRS stereo plugs can also be limiting because of the common ground contact resistance - load current on one output channel will couple to the "silent" channel through the gnd contact Vdrop a independent signal source can help - a portable mp3 player can be good for this

8th March 2009, 03:46 PM	#4
nelsonvandal diyAudio Member Join Date: Nov 2006	This is loopback, no load. I'm using the RMAA default in PatchMix. 24 bit and 96 kHz. I have to go to work now, but please give me some ideas of what's wrong.

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