I see no reason why the Audio Research,with associated power needs would NOT go into the outlet directly.That being said,the PS Audio UPC 200's (though not really line conditioners)seem to be a superb solution for many lower power usage amps(even though the UPC 200 does not have current limiting)which will actually clean the line(without filtering)and be an additional source of component protection.What's not to like?
Best!
Best!