As mentioned in my previous post adding a series resistor will add the thermal noise in series as well.
One detail I did not elaborate was that a series resistor will also form a voltage divider with the input impedance of the interface, resulting in around 15dB less signal, which would have to be compensated by increasing the interface gain by 15dB.
So the noise is increased, and the signal level is decreased. The result would likely be unacceptable signal-to-noise performance.
As mentioned the better solution is not to increase the impedance of the 8K input with a series resistor, but decrease the 1M input impedance of the instrument input with a parallel resistor.
I also see that you are using a TS plug, even though the audio interface has a differential input and can accept a TRS plug. It would require some slight rewiring of the turntable, but connecting the cartridge differentially to the interface might be slightly better performance.
Thank you very much Chris. I’m not familiar with electrical engineering and can’t follow. I will not solder any plugs and accept the realization that it makes a difference to record from the amplifier or to plug the turntable cables directly into the recording device. I wanted to use an old record from my former band as a reference for a current mix of another recording, that was the original idea, but I’m putting it on hold now.
Your original configuration with turntable to Yamaha amp, and aux out to your RME is just fine for that. The direct recording approach is of interest to archivists and hardware hobbyists, but is just a distraction to your needs.
Yes, of course. I was just skimming some of the early posts and did not read through all of the early posts to remind myself the final conclusions about the proper terms for the Yamaha connections.
