Hmm, ok. I asked because some of your issues with the sound seemed symptomatic of overly high output impedance. Using that jack lessens the maximum volume, as well as the amp's control over the drivers. Meier includes it on his amps because some headphones (only the Beyer DT831/931 that I know of) were designed to be used with that output impedance. But it just makes most other headphones sound rounder/slower, among other effects.
Also, the statement you made "At the front of the Opera there are two headphone outputs, one for High impendence cans and another for low impedance cans" is not really accurate. Even most high impedance headphones will sound better from the low output impedance jack because the amp will have better control of the drivers. A more accurate statement to describe the two outputs might be: The Opera provides a standard zero output impedance jack for driving most headphones, and a jack with 120ohm output impedance which can sound better with certain select headphones.
I just wanted to make sure there is no confusion over this issue, as using the high impedance jack on headphones not designed for will generally decrease technical sound quality.
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