Best amp for natural timbre of unamplified acoustic instruments & vocals w/ Revel F32?

Maplegrovemusic,
Yes I would find it hard to believe that a speaker would be intentionally designed to sound as described. On an open forum we can only respond to the information provided. If the OP has determined the speaker is the weak link then it's reasonable to suggest that another speaker may likely improve his situation. It could certainly be the fault of another system component or issue,  it also could be the speaker as the OP suspects. I do hope that he solves the problem to his satisfaction. 
Charles, 

Maple, it is great advise to sell. We all have subjective likes and dislikes. The speaker sounds this way to the poster and to another it would be heaven. Subjective. He should consider selling as they don't fit his particular taste. 

If those speakers sound that way, IMO, it's because they are just not working in your room.  In a typical domestic environment, It has always been my experience that some speakers work and some don't and it's trial and error until you find something you like.  That said, I would buy an integrated with tone controls like the Mac or perhaps some others.  This will allow you to better contour the sound to your liking.  Good luck.