Now you have a different question
Would a $70 steal of a deal on that 2800 would be good to go with a Mac?
If he has no modern 5.1 processing power, etc, yes, this should be fine if it has features that will meet his needs. But remember you need an amp for each channel. How many Macs does he have? Even if just for the two fronts, it will go just fine as long as the 2800 has pre amp outs that it should.
And, for $70 it is a steal as that will be his out of pocket expense whereas a newer 38XX will be much more.