Rotel has announced upgraded MKII versions of its award-winning stereo preamplifiers. The RC-1590MKII and RC-1572MKII feature a variety of acoustic and performance upgrades, using technologies engineered for Michi series. Both units now also support MQA and MQA Studio via the PC-USB input and are certified Roon Tested. RS232 and IP provide control system integration and software updates. There have been over 75 critical component changes, says the brand, including new couplin