darkless

Another thing to try would be to connect whatever is directly downstream to your ISO REGEN (the DC37?) directly to a grounded outlet. Going through a power conditioner could adversely affect the grounding. It may sound strange, but that's exactly what happened in my case. My ISO REGEN was feeding my Chord DAVE which happened to be connected to ground through a Supra mains block using one of the filtered sockets. When I switched to an unfiltered socket on the same mains block the problem disappeared. Somehow the more direct connection to ground solved the issue.

It would prevent noise from reaching the USB receiver which by necessity sits before the galvanic isolation, making the DAC vulnerable to noise migrating from USB receiver to the ground plane, potentially polluting the sensitive inner circuits sharing the same ground plane.

Unfortunately my weekend listening plans were cancelled due to a change of family plans. Feel free to publish the results at your leisure. I will try to download the files tonight so that I may be ready in case another listening opportunity presents itself.

I plan on listening to your test files during the weekend using my DAVE.

Which cable length did you order for your new Gotham GAC-4/1 cable?

The USPCB also improved on my 30 cm QED Reference USB cable.

I'm also interested in this comparison.

Hi Alex, Yes, as soon as I established a proper "earth", I was able to re-enable the galvanic isolation (switch set to ISO). Having already read this thread and the other ISO REGEN thread, I felt confident that my earthing solution would likely solve the initial dropouts. No trouble here. Thanks again for your excellent customer service and comments here on CA. Hopefully my feedback will contribute to others finding similar solutions to their dropouts issues. Just to repeat what Alex said, the above mentioned dropouts issue due to lack of earth connection is not to be confused with the crackling sounds due to a bad board in some of the ISO REGENs from the original batch. Alex is resolving this as soon as humanly possible. Be sure to let him know if you suffer from this.

I received my ISO REGEN two days ago from Martin @ VortexBox, and like a few others I also experienced dropouts which could only be resolved by unplugging and reconnecting the USB connection to my DAC. However, bypassing the isolation mechanism using the switch on the ISO REGEN made the problem go away. I replaced my cheap 2-prong mains distribution block (no earth) with a proper 3-prong mains block and I'm back to enjoying sweet music like never before.

x2. In addition I would like to know how the ISO REGEN by itself compares to either combo.

@lmitche Do you prefer the Adnaco+ISO Regen combo or either device by itself?

Will vortexbox.co.uk receive its share of ISO REGENs as planned?

Just preordered from vortexbox.co.uk. Just 4 units left now. Also, the minor issue with their online payment provider has been fixed, so grab your credit cards gentlemen!