Rotel RC-1590 MkII Stereo Preamplifier and RB 1590 Stereo Amplifier Review Jim MiltonJuly 19, 2021 Rotel, who has been in the audio business for 60 years, has released an updated version of their stereo preamplifier which contains some trickle-down technology from their high-end Michi line. Amplifier ReviewsPreamplifiersReviews