Help in designing a speaker driven by an LM386
First, you WILL need to put a divider, or an amplifier with a gain of .05 before the LM386. 

The minimum parts schematic you reference in the datasheet will work for you. The part has a DC offset of Vcc/2 at the output. The purpose of that matching network is two-fold. First, it keeps the DC contained to the output pin, away from the speaker. The second function is matching. Follow that schematic and you should be fine. The only thing to add that isn't on the schematic is a decoupling capacitor at the power pin. If you don't add one, you will get some very weird artifacts at the output.

The part will do 17 kHz easily, and can go out over 100 kHz. 

I would try to find 12V to power it though. The part was originally designed for automotive use.