I revisited this tonight, and found what you mean. First I had to set a max timeset to 0.1u and the other thing I had to do was use actual values for my resistors, as it just did not work with 3 * {RES}
It does show about 8db lower third harmonic (it is already ridiculously low at around -230db but goes down to around -242db (ltSpice fantasy land).
So if it doesn't affect the noise, I will be implementing this suggestion. Thanks!
Tony.
You are using a laptop to power the 2i2, and as well your mains supply doesn't have a protective earth. As such you don't have a ground loop to break, and if you wanted you could run the laptop on its batteries, so your spectrum plot has a confident low level of hum related frequency components, which are related just to layout and leakage to cables and 2i2. That then gives you a confident benchmark from which to make single changes in amplifier setup and operation, and to make fairly robust comparison assessments.
If you can justify the stand-alone 1kHz oscillator then that certainly should provide a very nice benchmark. It is always better to have independent testing means, to allow comparisons, and hence allow a rugged confirmation that there isn't some quirk leading you astray.
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