Testing, testing, 1... 2... BLAT!!! ARGH!!!
My digital console looked a bit unloved, so I decided to use it as a fancy signal generator to do some testing with the Kemper Stage. I made a video of my methods and observations in case it is interesting to anyone from a technical standpoint. Some of it just helps *visualise* what's happening to signals rather than giving out numbers. I accept that some of this may be known already or buried in the manuals and that I've also taken some liberty with my assumptions!
I'm interested to keep the technical conversations going for my own learning, so if there is something flawed in my test methods - [entirely possible] - and/or you're getting wildly different results, please let me know and I will try, try again...
Here are the video 'chapters' if you just want to skip through:
0:05 SSL Live test rig explanation
1:10 +14dB of gain measured from inst. input to line output
2:00 -12dB switch is two -6dB stages
2:30 Different gain stages in the signal path
3:00 Bug in latest 7.4.1 release regarding -6 dB switch for Git+Processing
4:40 1kHz tone stack harmonics test
5:00 Pink Noise Stack test
5:30 Phase cancellation test - nice and flat
6:50 Latency measured = 2.5 ms
8:10 Constant latency mode = 4.9 ms
9:30 Essential cheesey outro
Notes in addition to commentary, the phase-cancellation test did factor in the latency of the return signal, delaying the reference, I just didn't mention it. It made no significant difference to the result. I could get absolute cancellation of the 1kHz sine wave signal when aligned, but also didn't show this.
All the best,