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I just received my O2 today.
Very pleased, the unit is well built and solid. This thing can drive just about any headphone you could buy.
I ordered the medium gain(1X/3.3X) and I don't need to go higher than 11 oclock on 40-60ohm headphones and even with 300ohm headphones I don't go over 1 oclock. I'm using 1X gain coming from a 2.1V output DAC with system volume at 100%.
Unless you're source is a tablet or a phone I think most people would be fine with medium gain.
Even if you did order default gain you may just have to turn down your source to get a bit more range from the volume pot.


What power adapter should I get for usa
MRJFEB
120V power adapter which you can get it from JDS Labs or Mayflower electronics.
OpasTanti
Thanks for the help
why the review on amazon is so bad about this thing?
How do these perform with the Senheiser 6XX and 58X? Can I use them without the dac? or should I get the Schitt Fulla 2 for the same price?
can i use this alone without a dac with the hd6xx please? thanks
KrisBali
Of course. DAC is kinda optional but amp is a must for hard-driving headphones
This product page shows two different models...wtf is the description referencing to?
twstdhd
This drop is for the desktop version(RCA input and 6.35mm output jack)
Has anyone succeeded in opening this to add batteries? If so, can you explain the teardown? The screws are nightmare, but even after they are out, there is still a tiny outward facing torx screw that seems to attach the RCA jacks but maybe also needs to be removed to open it. I didn't have a precision torx screwdriver to remove it, and I'm wondering if that is needed (doesn't seem to come apart easily with just the screws removed so I suspect it does need to be removed).
crimsontime
You gotta remove all 5 screws including the torx one. After that, just install the batteries in like you would normally do.
THE O2 amp does it include the DAC or is it at least an add on option??
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I like it, it's very clean with no background noise, seperation is good and soundstage is wider than my fiio e10k. It has optical, usb and coaxial input and 2.1v rca output. It's cheaper than a Schiit Modi uber but has the same connections. I find it on this forum https://audiosciencereview.com/forum/index.php?threads/topping-d30-dac-measurement-and-review.2016/
I try to avoid the nonsense on Headfi and find objective reviews on products. I bought it from Shenzhen Audio in China, they shipped it to me in Australia in 6 days.
It was about 120USD with free shipping. https://www.shenzhenaudio.com/topping-d30-dsd-audio-decoder-usb-koaxiale-optische-faser-xmos-cs4398-24-bit.html
It does sell on Massdrop too but I didn't want to wait for another drop.
Sip_Fo
The Audioquest Dragonfly series are a good choice too but they are usb input only so it is handy for portable setups and about the same price as the D30.
Dang SOLD OUT. Just my luck when I finally decide to pull the trigger. How does the aune 1xs 10th anv. compare to this for an amp and dac for Senn HD6xx?
Morphenox
What you could do is to buy the Massdrop O2 220v version and buy a separate 120v adapter from JDSlabs for 13$.
https://www.jdslabs.com/mobile/products/147/15vac-power-adapter/
The jdslabs adapter is even more powerful 15v/500mA instead of 12v/200mA for the bundled adapter from Massdrop. I bought two Massdrop O2s, one with the SDAC. And I ordered from JDSLabs 2 adapters (one for each) to upgrade the bundled adapters. At least the JDSlabs adapters are specifically made for the O2 and are accredited to electrical standards, contrary to the bundled Massdrop adapters.
I think I should return my smsl t2 to amazon for this bad boy! hmm...
Hello,

I've just recived my O2 "Model/AC Adapter/Gain Option: Desktop Edition - 220 V - Medium Gain (1.0x Low, 3.3x High)".

In France we have 220v at 50hz so the Massdrop O2 power supply (240v at 60hz) makes me questionnable !

I confirm, it's working great with an adaptator to EU plug.

Tester give me a stable 14,7v for 13,5v minimum required (12v on the sticker) !

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The O2 is my first purchase on Massdrop, I’m waiting for a pair of TFZ Exclusive 5 I ordered.
I think I will continue to monitor good deals on Massdrop !!!
I really enjoy discussing with the community with my ugly frenglish ;-)
Thanks for your advice!
This is my recommandation: 12.99$
https://www.jdslabs.com/mobile/products/147/15vac-power-adapter/

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