i wouldnt necessarily attribute this just to the monitors that youve been using (tho obvs i dont know much about how you use them, at what levels, proximity etc)- there could be other causes here that would be best looked at by an ENT specialist. i asked before if you smoke/vape- this is because i had/have issues with one ear that sound very similar to the ones you describe, and the conclusion i came to in my circs was that it was possibly a reaction to a particular principle ingredient in e-liquid. so that for example is one avenue worth considering if its applicable, and there may be many more

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