They are all about the same. :)
It's actually really sad it isn't always included in the DACs themselves. The main benefit is they prevent ground loops, from either the audio outs or the digital interface. The first is very easy to hear, sounds like humm.
The second is not and causes additional, measurable jitter.
Unfortunately not all DAC's are happy with isolators. My Mytek is not, and it does suffer from ground loops depending on the connection. I have to just use other sources.
Most DAC's however will work just fine with the cheapie isolators.
It's actually really sad it isn't always included in the DACs themselves. The main benefit is they prevent ground loops, from either the audio outs or the digital interface. The first is very easy to hear, sounds like humm.
The second is not and causes additional, measurable jitter.
Unfortunately not all DAC's are happy with isolators. My Mytek is not, and it does suffer from ground loops depending on the connection. I have to just use other sources.
Most DAC's however will work just fine with the cheapie isolators.