So the ARC SP11 preamp has the following Input Impedance options:47 kOhms, 100 Ohms, 30 Ohms, 10 Ohms and 3 Ohms. According to ARC the 47 kOhm is for MM cartridges and the rest for MC. For my Shure V15V no problem - 47kOhm. But for my MC Van den hul its recommend 500 ohm or higher - so it goes...