[Harp-L] Questions about Impendance Matching Trasformer

I have a low impendance mic that I use with a simple guitar amp. The amp has
has those three knobs that control the different levels. Generally, I have
the high tones turned down low and the low tones turned up. Do you recommend
I use one of those transformers?
Also, I've seen low impendance to high impendance adapters at Radio Shack.
Are these what you are talking about, or are these specifically for the

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