I run 3M RF absorber under the lid of my P-20. Those big toroidal transformers have a field running up through them. Check out my thread in my profile about playing around with RF absorption. You can get too much but when sized right and positioned correctly you can cure lots of ills affecting the sound but if you get too much things sound too thin and hollow. It’s like positioning speakers. There is a sweetspot that blossoms with the correct amount. It’s best to use a recording of someone’s voice you heard live or an instrument you know well played live.
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