You'd think $20k to $80k speakers would have it too, but they do not.

All linear power supplies I've seen from Meridian (as well as many other brands) have the toroid transformer connect directly to mains.

The D.C. Offset filter needs to be before the transformer. Because it's the transformer itself that sometimes hums.

- Fiddler (IMHO)

If you think listening to music is fun, try learning an instrument.
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