So I just got a Mac and I love it. But the speaker match has been a challenge. First, I need to have bookshelf speakers with the space I have. Second, I can't add a subwoofer. So... I am starting testing with a beautiful pair of Harbeth P3ESR. They sound wonderful EXCEPT when you crank the volume and add heavy bass. At that point, you get some clipping. I'm told that's because they aren't powerful enough and are demanding too much energy from the Mac. I'm considering trying something as obvious as the KLF LS50s or Klipsch R-51s. Anybody have experience with this? Also, do I need to look at powered vs. passive if I want that Fela Kuti record to blast out right? Is there a downside, sound-wise, to powered speakers? Thanks everyone.