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They should not be plugged in 'upside down'. International users must use a reasonable quality plug adapter which preserves absolute polarity. Note that European and Australian plugs swap active and neutral positions so if there is a one to one correspondence in your adapter plug then the Reference II will need to be plugged into the adapter upside down compared to a USA socket, in order to preserve the AC polarity.
These filters come packaged in 'wall-wart' style cases
Correct.How does the filter sound since it was flipped around?