Building an Audio Analyzer with Matrices and Mega2560 / Uno and FFT and Op amps

If there is no LM386 with open loop configuration, than you shouldn't bring this argument (open/ close loop ) in discussion. It's not related.

It was to show you that the 200x gain for lm386 is closed loop gain. Comparing that to an opamp in open loop, or a transistor in open loop, makes no sense.

A 800x (hFE) transistor can have a (closed loop) gain < 1x, for example.

apples vs. oranges.