Classical Music... flatness and choices

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I am a noob. Building a tower for classical listening. Regarding the treatment of bass in building a speaker I am looking at a few different choices. If I went the non horn route my efficiency is generally a little low I am finding. Lower then I want.

If the (for example) 91db 6 inch driver FLAT to 80hz and crossing at 80hz to the 10-12 inch sub at 84d then how noticeable is this? Is it more forgiving specifically as these are lower frequencies to cross in this manner?
 
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