OK, coming back after a long while to measuring with REW. Very nice to see how much this software has grown over the years!
Along with refamiliarizing with the basics... (I formerly did a lot of speaker driver and room measuring) I'm trying a few new things, like measuring optical interfaces, and trying to evaluate if they have impact on downstream devices. I have run into two kinds of problems, one of which I'm not sure is a capability issue or not.
1. I try to measure something between two USB sound devices, and get wildly erratic results. Example: A Schiit Modi USB DAC, analog out into a SB Xfi-HD soundcard analog in. I get FR traces, but extremely distorted. Seems like there's issues with timing? Maybe I have a timing setting wrong for this case? Maybe you can't run two separate USB sound devices at the same time?
2. I'm also trying to evaluate optical inputs. I find issues where my receiving device cant always recieve the digital audio. Example, the aforementioned XFi-HD, which has both optical in and out, can happily loopback, but with some inputs, for example my TV optical out... HDMI audio in -> TV TOSLINK out, to XFi TOSLINK in, I get zero audio. If I plug that into the Modi, I hear it fine.
Along with refamiliarizing with the basics... (I formerly did a lot of speaker driver and room measuring) I'm trying a few new things, like measuring optical interfaces, and trying to evaluate if they have impact on downstream devices. I have run into two kinds of problems, one of which I'm not sure is a capability issue or not.
1. I try to measure something between two USB sound devices, and get wildly erratic results. Example: A Schiit Modi USB DAC, analog out into a SB Xfi-HD soundcard analog in. I get FR traces, but extremely distorted. Seems like there's issues with timing? Maybe I have a timing setting wrong for this case? Maybe you can't run two separate USB sound devices at the same time?
2. I'm also trying to evaluate optical inputs. I find issues where my receiving device cant always recieve the digital audio. Example, the aforementioned XFi-HD, which has both optical in and out, can happily loopback, but with some inputs, for example my TV optical out... HDMI audio in -> TV TOSLINK out, to XFi TOSLINK in, I get zero audio. If I plug that into the Modi, I hear it fine.