The Arc's are going to provide considerably deeper bass and a greater depth to the soundstage. The Harbeth's will sound more open and high resolution with a little more of an etched high end. The Arc's will have the better midrange of the two however. The Arc's are a more mellow and laid back sound, the Harbeth's a little more in your face. The Arc's run on 8 wpc. and up, virtually any amplifier is capable of driving them although we have found that Metronome, Chord, and ReVox are good choices for solid state, and Papworth and Unison are excellent choices for tubes.
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