OK, I finally put Marlin on my MonoPrice Maker Ultimate, the major benefit is I can finally adjust motor current now. This Printer is way nosier than V2 and plus without motor current adjustment. Since the frame is so stable, I want to make it print faster, the the noise is off chart!
In Marlin Settings - Driver strength - the default setting is 1200, I was able to get it work at 500, but to be balanced with quiet and torque, I set them to 800, with tl-smoother, it is quiet enough at 800. This is eeprom setting so make sure you save it before reboot.
It still generate some noise when it do fast back-forth infills at high speed, but that is mechanic noise, the frame is stable, and unlike the high frequency motor noise, the mechanic noise don't go very far. I'm very happy with it now.
(Da Vinci 1.0, Jr. 1.0 RAMPS, miniMaker) X4, (Creality CR-10S, CR-10 mini, Ender-3) X4, Anycubic MEGA X4, Anycubic Chrion X1, ADMILAB Gantry X2 (MonoPrice Maker Select V2, Plus, Ultimate)X4--Select mini X1, Anycubic photon X4, Wanhao duplicate D7 X1.
iNSTONE Inventor Pro X2, CTC Dual X2, ANET-A8, Hictop 3DP-11, Solidoodle Press, FLSUN I3 2017X1