Originally Posted By: jazzmammal
No, that's not what Mac said. Here is what he said:

"If you use the Grounded Surge strip and plug everything else into it along with the computer through the two prong adaptor, there will still be a path to AC Ground for the computer, it will just be going through the other stuff that's hooked up, one path instead of two.

This is legal in the US electrical code, that's why the adaptors are still UL listed, among other things."

The USB cable has nothing to do with this. Without rereading this whole thread, I believe you brought that up merely as one possibility for solving this. It's now been shown it's not necessary to worry about the USB cable, the other stuff plugged into the power strip is covering the AC ground.

Bob

Sorry Bob, but in THIS case the USB cable has EVERYTHING to do with it. It is the USB cable that is connecting to the next device (Presonus AudioBox (PAB)) AND PROVIDING THE SECOND GROUND PATH that needs to be eliminated.

IMHO a USB cable ground wire has insufficient current carrying capacity to truly provide protection.

Quote:

2. Signal goes from back panel USB port—which MAY be USB 3, I don't know how to tell—to PreSonus AudioBox (PAB) USB. Signal also comes from Behringer 16 x 2 mixer to PAB preamps. Signal comes out of the PAB to (a) Behry 4-ch. headphone amp, and (b) JBL PSW-D110 sub ins, and out of Xover to (c) Behry TRUTH B2031A active two-way monitors.

Back panel USB port mentioned above is from the PC.

--=-- My credo: If it's worth doing, it's worth overdoing - just ask my missus, she'll tell ya laugh --=--
You're only paranoid if you're wrong!