It might work. Everyone seems to have an opinion about using them though
Personally the ones i've used have seemed to flatten the sound out enough that I notice it on the highs and lows, so i'd rather do any number of other options than deal with that. Other people use them and are perfectly happy though so YMMV.
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I have experienced the same intermittent screech on my system as you, so I feel your pain. It was fixed when i grounded the system properly.