Rob - I've just looked at your web site and at the pictures of the Disruptor and "in principle" it is very similar to the Doukmall cable...
- in that there is one cable for the digital signal and a totally separate cable for the power supply.
Basically - As I see it, the differences between the two products are...
The Doukmall product...
- is made in China
- uses high quality USB cable
- BUT requires an additional power supply - the choice of which is left to the discretion of the consumer.
- But which power supplies are good?
- Poor quality power supplies will degrade DAC performance!
- There are literally hundreds of USB power supplies to choose from and they all perform to different levels - I have tried 9 to date - the Enercell 5v 1 amp being as good as a battery USB supply
The Disruptor product...
- is made in the USA
- uses a high quality power supply
- BUT requires an additional USB cable, the choice of which is left to the discretion of the consumer.
- But which USB cables are good?
- Computer grade USB cables may, or may not offer the ultimate in audio performance - there are hundreds to choose from
- One might "assume" any cable provided by the manufacturer of the DAC to offer the best SQ - but as seen many times - it may not be the case.
- High Quality third party "audio" USB cables may (or may not) provide the "ultimate" in SQ performance.
The debate about the use of Computer Grade vs Audio Grade USB cables for audio data transfers will be ongoing and the outcome is always based on the "opinion" of a specific consumer.
But one thing that is certain - asynchronous USB data transfers, as used in streaming to DACs, ARE NOT vetted for completeness by the DAC, i.e. it is not known whether the data sent by the computer actually arrived at the DAC intact - and as a result SQ can be affected.
With all that said, I do believe the Disruptor offers an alternate approach to providing "clean power" to the DAC, which will improve the performance of any DAC/SPDIF Converter that utilizes power normally made available via the computers USB cable!
It is unfortunate that I had not seen your product earlier, otherwise I would have purchased it - it just did not show up on my Google search at the time. :-(
Regards...