My 3.7i are sounding really good right now. What I recall that impressed me the most was it tamed down the high frequencies. I always felt that is was just a little too bright. The upgrade took that out and gave the music more warmth. I just love listening to Alison Krauss and Union Station. Her voice sounds so good. As I remember it helped the bass too. I will admit I run two JL subwoofers which adds a lot. Would I do it again, yes.
~Mike
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