Alpha Dac 1. Upgrade path?

I realize Berkeley stated the Series 2 has "new clocking and isolation technologies". What isolation techniques have they improved upon? New clocking? How?

Perhaps someone knows of an article that I can access?

Very early DAC1 cannot be upgraded to DAC2.
Check your serial number with Berkeley.

I don't own one. It's my "curiosity" about isolation? and clocking? improvements. New knowledge interests me and creates questions and ideas. Fun

Having owned both the DAC1 and DAC2 I wouldn't call it an upgrade exactly but rather a slight change in presentation. IMO: The DAC2 is a slightly kinder gentler version of the DAC1 but the 2 loses a few of the 1s strengths.
Some might prefer the 1 while others might prefer the 2. Your system could also influence a preference. For me it was a toss-up.
Sorry I don't know the technical details of the differences.