David Berning Quadrature Z or Vitus SS-101

I doubt too many can help with your inquiry. In any case you´re going to get you answer soon enough. I wish I were so blessed as to have such products to choose from. Please do keep us posted of your impressions, I´m sure many will be paying attention.

I've not heard the Vitus but had the Quadrature Z in my system for a week or so. The Berning amp has the vitality, transparency and illumination of a fine OTL. (Won't debate whether it actually *is* an OTL). It revealed layers of harmonic nuance - I liked to say you could tell that Dusty brushed with the Ipana, not the Colgate. Taut, tonally fulfilling bass. Easily the fastest amp I've ever heard. Good luck - the comparo should be a lot fun and I'd like to hear your assessment.

I heard the Berning in another system. I thought it became congested during large orchestral passages. It also made too much background noise. Something to consider in your own system since this is typically overlooked on a short-term A/B demo. If you don't listen to orchestral music and are not sensitive to noise, then you may like it.