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not sure where I read it but it might have been the Ultrasone PRO 900.
So ZO2 back on the table. I was looking at some reviews and I see that there's the ZO2.1 and the ZO2.3. Which one is better? I'm assuming that most resellers are selling the ZO2.3? Also what about the original ZO?
You won't be able to find the other ZO versions.
Only the ZO2.3, on amazon, etc.
Unless that said, you buy it used/old from another member here.
I don't know which is better, but i like my ZO2.3 very much
And yeah there were reports with the Pro 900 - that's got nothing to do with the D2K's though
And again, it depends on what you are sourcing/paring it with, amps etc...some people reported problems with the pro900 some others said it was fine.
long story short, if you want a bass boosting amp, the ZO2 should be your first, and only ever stop.
if you want to drive them much louder, and keep them "clean/lean" sounding, then get the e11 or one of the ones in the fiiO family.