when you add a CU-180 copper mat, the ringing vanishes completely. I’m sure this will also be the case with the heavier plateau of the RX-5000, although you might need the heavier CU-500 mat for this. But Micro apparently knew very well what they were doing......
Micro Seiki gunmetal mats are amazing, not only for Micro turntables, but definitely for Technics direct drive turntables. My both Luxman PD-444 made by Micro Seiki too, but the CU-500 is too heavy for them, so i use CU-180 and even lighter Saec SS-300 which is also superb. Unfortunately i do not have appropriate turntable to use my mint- gunmetal CU-500 mat (sold my SP-10mkII to a firend). If anyone looking for Micro CU-500 in top condition - let me know.
P.S. Also using Reed 3P "12 and Fidelity-Research FR-64fx tonearms.