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I had a opportunity to try the Oji balanced portable that I mentioned
here. I went to audition at Fujiya Avic.
I brought blueDragon Senn cable to use it with HD650.

However the gain of the Oji was so low and I could not have a sufficient volume level. So I changed it to GS1000 balanced that is a shop demo. But again I could not.
Seems like they designed it to match AT cans or any other easier to drive one.
From what I heard a little, the sounding itself is not bad. I heard they are working to implement a gain switch so I will try it again on the another chance.