You are overdriving something (the preamp probably). Don't know that much about your equipment, but that's my guess.
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The amp's meters are calibrated at 4 ohms. The Revels are 6 nominal, dropping to 3. The Arcam FMJ puts out 2.2 vrms, which is a healthy output for any source, and above average in my experience. I would check volume control on the FMJ too just to make sure it's not variable, or turned down.
Also, you can set the Levinson to +18dB on that source (which you may have already done). If it starts to distort at +18, you should NOT use that. Distortion kills speakers. But it's worth a try. Just stop it immediately if you hear distortion. Some sources don't like +18.