I have last one Question, which I always have answered for myself right at the beginning.
Have you tested your SOURCE and TOOLS which you use to MEASURE this amp with?
I see you use REW. What's about the Sound interface? What about the cables, the jacks, and so on and on.
Setup all at you used to measure your amp and then measure the source..
Do you see similar occurrences..?
This was the last Question..
Sometimes it is necessary to even check the tool you are going to check your Products.. only and only then you can be sure that measurement is ok.
I got fooled by such things so many times, that prior to any test I will test the tools, heat the Oscilloscope for an hour even it's digital, heat up the Distortion Meters, the signal Gens and so on.. then one can rely on the test..
But there is something I need to say: Good Job.. Well done.!
Regards Chris Hess
Have you tested your SOURCE and TOOLS which you use to MEASURE this amp with?
I see you use REW. What's about the Sound interface? What about the cables, the jacks, and so on and on.
Setup all at you used to measure your amp and then measure the source..
Do you see similar occurrences..?
This was the last Question..
Sometimes it is necessary to even check the tool you are going to check your Products.. only and only then you can be sure that measurement is ok.
I got fooled by such things so many times, that prior to any test I will test the tools, heat the Oscilloscope for an hour even it's digital, heat up the Distortion Meters, the signal Gens and so on.. then one can rely on the test..
But there is something I need to say: Good Job.. Well done.!
Regards Chris Hess
I did. Attached is the loop back using the same configuration and the same input, same output, same cable and same connectors. It is an E-MU 0404 USB running from a laptop. A battery pack/battery bank is being used to power the E-MU 0404 due to mains/power line harmonics that occur when the original SMPS wall adapter is used.
I went through a bit of a journey on the interfaces from an Audigy 2ZS (in a desktop) to an SB0490 (Creative Sound Blaster Live! 24 Bit USB, laptop) to repaired E-MU 1616m and 1820m (microdocks, connected to E-MU 1010 PCI cards in a desktop) to finally my current configuration of E-MU 0404 USB with battery pack, laptop and balanced attenutator through the XLR input only.
While the 1616m and 1820m can produce better loopbacks the E-MU 0404 USB running from battery power and a laptop has advantages. The XLR input also produces better results (it bypasses an NE5532 for the TRS line inputs). Channel B is also a little better than A. I also turn the laptop WiFi off during measurements.
