I have been have problems with measuring crosstalk, this time on a preamp. I was using 1.219 and reinstalled it with no improvement. I then went back to 1.218 and no change. It keeps telling me that the stop level must be greater than the start value, which it is for either example I am showing:
As an aside, this automated test does not pull up the previously saved settings when you restart it.
Anyone else seen this ? It was working most of the time, but recently this has shown up- possibly a corrupt setting that did not get reset when going to 1.128 (maybe go back further?)
Hi @Var, I think this is related to the problem you posted on 10-July-2025.
Here’s how to duplicate:
Open the AmpCrosstalk plug-in and click Defaults in the menu.
Run the plugin. You can cancel it and stop early
Run the plugin again. This time, but your Start Level at 10. The Stop Level is 0, so this will give an error. However, first you’ll see an exception.
Tell the exception you want to keep going. Run the AmpCrosstalk again. This time hit OK and you’ll see the correct message “Value must be > Start Level”
Now change Start Level to -6 and Stop Level to 0. Press OK.
This will still give the error message. Now, your 10-July bug report showed your Save aftion was saving the last settings, not the one you just entered. So, there’s a bug where the last settings (not current settings) are being used for the validation.
I think this has been fixed, but needs to be merged and then released.
Thanks Matt as always. I did have the saving settings and reloading them issue, but will try as you again as you pointed out- may be a day or two as I am knee deep in a repair
I was able to test the method you described with the Amp Freq Response test , which had the same problem as the crosstalk, and it worked, so at least there is a work around when using 1.219. I did not try to load any settings yet. THanks!
@matt - I will try it out with a receiver I will be testing later in the day.Update- I did tried it with the crosstalk test with no issues including setting the start and end levels to the same value with a 0.1 step increase so it just would (hopefully) run it at one level, which it did. Have not tried loading previous saved automated test settings yet- today’s task.
Hey Scott, would you mind sharing your settings for the successful crosstalk test on that repaired receiver and maybe a plot so I can compare with my settings? I’ve had a few unusual plots recently and resorted to manual spot frequency tests.
@restorer-john No problem. Here is the plot as well as the settings. To be honest, this was not the typical crosstalk plot I get, but this is a Kenwood TK-40 receiver from 1967 and all original (except the lamps I just replaced).It looks more like a loudness curve.
@restorer-john I will be measuring a newer, but still vintage, Carver preamp probably tomorrow and will share its crosstalk plot here using 1.220. Looking at the CEA490 specs it looks to me like Crosstalk according to it is more like what I call input to input isolation, and Separation is more like what the QA40x measures…..
