Add cryogenic treatment of most contacts; a very precise line-voltage display (red standard, blue or green optional); a power polarity indicator for the IEC; a heavy non-magnetic casing with black or silver fascia... and you've got the essentials of the component-sized component-weight GigaWatt PC-4 EVO DCB. Of course there's more to it. For that, simply go to their website. As mentioned already, DCB stands for
DC blocker*. That is an optional filter module which blocks DC components on the power line. Those desymmetrize the AC waveform and can cause transformer cores to hum. As my experiments and ownership of Vibex DC filters have shown, proper DC filtering can be enormously beneficial even on components whose transformers have never hummed before.
As a reminder of what €5'130 with LC-3 power cord buy you from GigaWatt; or €6'000 with their top-line cord - check out this shot of their PC-3 EVO SE I
reviewed two years ago. We see the silver-clad power distribution bars, the potted surge module to the left with the three discrete filter banks next which each feed a power duplex, primary filter blocks in the front, all primary connections made via bolts and cold-forged crimps.