Optimal loading for Dynavector xx2

The output impedance of your cartridge is 6 ohms. You've no doubt run across the "25 times" rule regarding a theoretical optimum load of 25 x the cart impedance = (in your case) 150 ohms. The actual best loading in your system will fall in a range of 50% higher to 50% lower than that optimum point, in otherwords, 75 ohms to 225 ohms.

It's best to start lower, say 100 ohms, and then move up slowly: 120, 140, 160, etc. until the bass tightens up and stops being muddy/boomy (but without thinning out or losing strength) and you'll be at just the right place.

I have the exact same 0.23 mV cartridge and depending on the phono stage in use with it, I highly recommend you set it for 100 ohms loading.

What make and model of phono stage are you planning to use with the DV XX-2 cartridge?

I am using a Michael Yee PF1 phono stage, very versatile in terms of cartridge load settings.