Yeah updated my post. I was picturing a completely different design. Thanks

I don't understand this. I thought gain was the last step before sending the signal into the headphones? At 2v the o2 can output 13.3mw into 300ohm headphones, making all of my previous calculations an order of magnitude off. The maximum output power specified then is with 3.5x gain with a 2v...

Potential channel balance problems as the blog mentions. More noise and distortion is always something that comes with more gain. Now if the noise and distortion are actually audible is another story, but theres no point to higher gain if a lower setting does everything you need. The difference...

I got my hd650s a couple of days ago off Amazon for $313, cheapest they've been for years. They only sound slightly better than my hd555s, but I'm using onboard on my $70 motherboard lol. Looking for a big upgrade with o2+odac.

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IIRC the best position is 12 o'clock. Can anyone find how much power the o2 puts into 300ohms? It would make the gain decision much easier, but taking a guess with 97db/mw the hd650 has you should be able to reach peaks of 120db. Again that is peaks, so if a track is mostly -30 db, then unity...

Would 1x/2.5x gain be enough for o2+odac or should I go for 1x/3.5. Using hd650s. Thanks

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