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Polk RTA 11

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Properly? No. They are rated to handle up to 250 watts each so 50 wpc is really low but they'll work fine since most of us use less than 10 watts at normal listening levels unless you are used to listening at very high levels.

But having higher power amp definitely enhance the sound.
I'd recommend at least 100 wpc high current but don't let that stop you from using it with the Mac.
 
it will be fine with RTA11...I have powered AR9 with my MC2505 and you notice when it ran out of power.....clean power unlike other cheap amps

I run my AR9 with MC2105 and MC2505 and it really sings...

MC2505 is the metered version of your MC250 as you probably know....
 
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