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E111
192
Sep 28, 2017
The O2 is enough for the DT770/880/990/ 250 and 600 ohm, HD650 and HE-400i on low gain? is there a huge quality difference from low to high gain on cans of this caliber?(mostly for listening to 320kbps and FLAC, also some movies and gaming.)
E111Gain should be set based on the input level, not the desired output level, that's what the volume knob is for ;) It should drive 250-600ohm headphones, but I don't have mine yet (clearly), so I can't say with complete certainty yet.
blunt0id
49
Sep 29, 2017
E111Regarding the DT's - I believe so too. I read somewhere that the DT990 - 250 Ohms should at least be driven under 200mW. This should be doable by this amp/dac. Where my FIIO E10K is not enough - i thinking of replacing it for my gaming machine :P
shimage
228
Sep 29, 2017
E111How much gain you need depends on what you're using as a source (eg, is it line level or is it substantially quieter?), impedance/efficiency of the cans you're using, and how loud you listen to your music. For 600 Ohm cans, you will almost certainly want to use the high gain output. You won't hear a difference in quality between the different gains.
E111
192
Sep 29, 2017
TatteredmidnightSilly question but is there a favorable position for the volume knob for amps? like if your cans on high gain are between 1-3 and low around 10-12 one would be better to use than the other or both should sound identical?
E111Not a silly question at all. I do not have a favorite position, but you may want to read this bit by nwavguy:
http://nwavguy.blogspot.com/2011/07/o2-design-process.html
2-11 VOLUME CONTROL:
"Channel Balance – All pots have some channel balance error. Due to the logarithmic nature of perceived volume, and the way voltage dividers work, the channel balance error will be greatest at the lowest volume settings. And it’s different for every pot. The dScope has a real time channel balance measurement so you can literally turn the pot and watch the number in dB change in real time. It’s not uncommon for the louder channel to swap back and forth as the pot is trying to average a 0 dB error over its range. The dScope makes it relatively easy to find the worst case imbalance and it’s nearly always in the first 5% of the range. The key is to intelligently set the gain so you avoid using the few few percent of the volume control’s range."
The other portions of 2-11 are also relevant ​and interesting, but he isn't know for his brevity, so I will limit myself to the quoted bit :)
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