I waited quite a while for my Filharmonia but it was worth the wait. I am working on a review on both the speakers and the amp. To answer your question it is auto-bias.
Since the amp appears to have been "tuned" to work ideally with the Merlins (no 4, 8, or 16 ohm taps, for example), I'm interested to know how it performs with loudspeakers other than Merlin. It does seem to be a well built amplifier.
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