I have replaced the fiber speaker washers on the internal K3 speaker with neoprene flat washers, and the results were dramatic. The audio is now good with and without NR. There are now no resonances, shrill or otherwise, with NR turned on. This has made a ton of difference with noise reduction in my radio, and now it works quite nicely the way it should.
Roy Morris W4WFB K3 #323
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