Phono Preamp Settings/Question - Help Please

My amp's sensitivity is 2.24v, however its a 500W amp and I've had plenty of success with 2v out from my dac directly driving my amp. I have kef ls50's which I believe are 85db sensitive.

The manual is not so good:

https://www.musicalfidelity.com/uploads/catalogerfiles/mx-vynl/4_MX-VYNL_manual_issue_1.pdf

....but it looks like you can set it for MM with the added 6db switch on and that yields a sensitivity of 2.5 mV for full output, which is 4 volts. If someone reads this differently, please correct me.

I think that, with this setting, your 4mV cartridge will be able to have more than enough gain to output sufficient voltage necessary to drive your amp into clipping without overloading the phono stage and still loading the phono cartridge at 47K, even taking into account the losses of the passive volume control.

Although it is a solid-state phono stage, and so it should not be an issue, the thing that I don’t see is the output impedance, which can be an issue when using passive preamps into solid-state amps with lower input impedances. 

The input impedance of my power amp is 50kohms so I think that should be okay there given a 1:10 ratio even if the spec isn't listed on the musical fidelity. My passive is a TVC so that wont hurt impedance matching either.