SMSL AO200 MKII Stereo Amplifier – A Blogs & Little Things Review Indiana LangOctober 26, 2023 SMSL is back with another awesome amplifier, the AO200 MKII Stereo Amplifier. No, this is not the AO300, this is more like a half-model-year car, a minor update to the current AO200. Blogs & Little Things