Audio Alto has premiered A O105 Open Baffle Speaker System with the AA Reference ANL Anniversary preamplifier (reviewed here) at the Audio Show 2019 in Warsaw. The music source was Audio Alto Multi Media Center AA MMC 3H and all of the components were setup on AA new audio rack system. Audio Alto's AA R101 FR full range speakers, that I've reviewed here driven by Archus Audio Primus tube integrated amplifier. Room acoustic treatment was set up by RW Acoustics.