It'll work but with blacker background but with decreased dynamics since P300 isn't capable to deliver 100% of wall power.
Will Musical Fidelity A3cr work with Power Plant P300?
I read a review that the you can use the MF A3cr amp with the Power Plant 300. I am considering a Power Plant and thought I would need the P600 since the MF specs list its maximum draw at 600 watts.