Hi The Super Zero 2.0 is the current version of the original Super Zero. I've worked with the SZ since it first came out. And I've modified it to use the Hiquphon 0W1 tweeter. I don't know from the Absolute Zero, which replaced a different speaker (the BR1, I think). It's twice as expensive, and I saw one review that said it was edgy and a little nasal in the midrange. I've finished taking frequency response aqnd distortion measurement on the SZ and RSL, and I'm going to take a final listen to confirm my impressions.