It should be OK but the speakers are right on the limit of what the receiver will be able to handle. Also I think the MKs would really benefit from a higher end receiver to get the best from them and also this would have a bigger power supply so would be more likely to run them with no issues. I would monitor the temperature of the receiver to ensure it does not get too hot and make sure there is plenty of space around it for ventilation.
Thanks for the reply have not bought av receiver as of yet, still using my old naim-nvi to drive the MKs, want to use the n-vi for stereo only, am looking for a reasonable priced av receiver to replace it with ?