Polk R200 + Mission 778x. Anyone?

Hi Guys,
I have just bought a pair of Polk R200 speakers and am trying them out with a Mission 778x amplifier.
This amplifier is capable of handling 2x65w at 4ohm and I have to say that, even if I have to turn up the volume a bit, the system plays and plays well :).
However, I have two questions I would like to ask.
The first is whether I am getting a good performance from the speakers paired with this amp because of its 4ohm handling capabilities.
Then I noticed that the amp, after about one hour of playing, gets very warm on the left side of the case. I wouldn't want it to have problems handling the impedance of the speakers.
If anyone has both and can give me some feedback or reassure me on the pairing, I would be happy to hear their opinions. Thanks!


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