Here is the upstairs system. Not shown is the Puritan Audio Labs PSM136 power filter which the subwoofer and wall wart of the passive preamp plug into. The Puritan's DC blocker prevents hum in the sub's power supply. Both that and the Furutech GTO-D2 NCF passive power distributor plug into their wall outlets via 3m LessLoss C-Marc Entropic. The other three components get their power from the Furutech whose spare outlet holds a matching Furutech Clear Line NCF.

With five LessLoss loaners, I could tart up—dude out, gussy up, bling out?—five power feeds simultaneously to race potential Firewall shock value from 0 to 100 in one second flat.

One went on the Furutech input as the first connection, one each on the SD card transport, DAC and power amp and the last one…

… on the subwoofer's input. With the Puritan's 20A IEC, the last 640X didn't fit there to treat both sub and preamp together. But the autoformer passive needs power only for its remote control and active 40Hz Linkwitz-Riley custom filter. The big 12" sealed and downfiring sub with its Hypex plate amp was arguably more critical in the first place.

To remind ourselves how LessLoss Firewall tech evolved over the years, here is a photo from our review of the original next to the most current version terminated with the C-Marc Entropic pigtail option.