Recent content by dlr

Thanks, John.

When a single tone distortion measurement is copied to the main graph using Current it is displayed in the SPL & Phase tab. The HD component values numbers are not displayed on the graph itself as they are in the RTA graph. When saving the graph to file in the main graph it would be helpful if...

I'll read through the patent link. I had found and read through some of the first link thread that you started, was hoping that in the intervening years some other method may have been found. Evidently not. Other threads have had useful info that I've spent a lot of time scanning (500+ pages for...

I think that I had. I try to keep the running measurement total down as I'm experimenting with the RTA for amplifier distortion for optimal settings and discard those I no longer want to maintain. Part of that is due to finding your post in an older thread about added distortion. The results are...

Running in Windows 10 Pro. I've had it running for quite some time (many days). I'm doing a lot of testing/learning. For these I'm using the Delta 1010LT unbalanced out to balanced in. This was a loopback connection, calibrating the balanced inputs. Ch1 has been calibrated for several days. I...

Yes, but is that not that same thing as when using REW in virtual balanced sum mode, rather than differential mode? The ADCiso requires a splitter to input the same signal to both channels when it is in mono mode. This is what I did, used the same splitter in fact to input the same signal into...

I had noticed the phase shift, thought it must have been how REW processed the two channels, but it did seem odd to be 90 degrees. Interesting to see your equation for that. My earlier comments relating to calibration has to do with the noise present in the sum/diff responses. That may be...

It would have to be extremely small. Both channels overlay perfectly for as much as I can tell with decreasing scale. I may be that it's not apparent in the channel overlay, but shows up as the noise in the sum. Of course any timing of sampling is built into the ASIO provided by Delta. I have no...

Thanks for pointing this out. I calibrated two channels and ran quite a few tests. In doing that I found that the control panel for the Delta 1010LT ASIO that I've been using is active when using REW. I had thought it to be bypassed. The gain can be changed per channel as well as inverting the...

Thanks for that info. I had thought that might be an issue. The two channels are close, but that's probably not good enough. My idea for testing the Scarlett 2i2 is to insert a 10-turn pot on the 2i2 input as I did with the 1010LT for more precise settings, but I think I'll also use them on the...

This is comparison of single-channel vs dual-channel (Virtual Balanced Sum mode) multitone results. The noise floor shows improvement from about 3kHz on down. This brings me back to my question 1 above, can the dual-channel setup be considered valid? It's accepted for hardware done this way...

I ran standard measurements to test the Virtual Balanced mode with the splitter to two channels as above. Overlays are single channel, two channel in Sum mode and two channels in Diff mode. The REW Levels display showed about 0.02dBFS difference with a 1kHz tone that was about 1mV. I'm not sure...

I've been using REW for audio interface and amplifier distortion measurements and following threads at AudioScienceReview. One ADC specifically for hardware measurements, the E1DA ADCiso that I purchased, has an option to combine stereo inputs into mono that when used with a splitter to both...

I have no experience with this, but got curious about it. The Behringer site for this one has a comment similar to yours with a recommendation to use an older driver (very old). A second one says to use ASIO4ALL. I use that for special cases. FlexASIO GUI makes it easier to set up. Worth looking...

It's probably not worth persuing. As you pointed out and I had been aware, for a saved measurement it's available in the SPL & Phase panel. The only issue is a fresh measurement that hasn't been saved. I'm often making a number of different measurements without saving. At times I've clicked on...