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[Official] OCN Headphones and Earphones Club - Page 1096

post #10951 of 37667
Quote:
Originally Posted by Crazy9000 View Post

Nice, the o2 looks pretty good. I considered getting one but I think I'll wait for the desktop version to come out, as I don't really listen to music on the go.

Well nothing prevents you from using the current build and just not using (or not even including) the batteries. It should be cheaper as well, particularly if you need to get panels made. If I'm reading it correctly--and I've been following--the improvements are supposed to be more about usability, like having jacks on the back side and a 1/4" jack, and eliminated turn on/off transients (though those are already pretty small), then anything to do with sound quality or which headphones can be driven. Also there's the ODAC option daughterboard for the desktop version, but supposedly that can just run standalone from USB power if you wanted that.

"Portable" or "transportable" doesn't mean it can't hang with many much larger desktop amps, or exceed them in some areas.
post #10952 of 37667
Razer Carcharias
Razer Megalodon
Sennheiser HD595
Sennheiser HD428
AKG K99
AKG Q701
Denon AHD2000 (Getting in January after a new credit card statement starts headphone.gif )
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post #10953 of 37667
the portable O2 is portable via batteries or via AC power so it's fine for both uses.
post #10954 of 37667
Quote:
Originally Posted by chinesekiwi View Post

Once I sort out payment details with MrSlim, my O2 headphone amp is on the way!
Happy Days! I just sent my final payment in to Mr Slim so I'll be O2ing for the New Year. I got the desktop version, it doesn't have NwAvGuy's revisions but it has connections on the back. When the ODAC is available I'll get a larger silver enclosure that holds them both.

Decided to get the WooStand. I can finally use my banana stands for hanging bananas...
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post #10955 of 37667
Quote:
Originally Posted by chinesekiwi View Post

Once I sort out payment details with MrSlim, my O2 headphone amp is on the way!
Then to sell my Ortofon eQ7's for some beyerdynamic DT1350 (or tbh, as I'm getting a car soon towards that as I don't really use my portable rig much these days) and I'm sweet!
Definitely getting the O2 though, no doubt about that!

Wow, based on reading the literature this seems to be the amp that most people should be building/getting. The cost is incredibly reasonable compared to the (snake oil and charlatan-driven) competition out there.
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post #10956 of 37667
Quote:
Originally Posted by friend'scatdied View Post

Wow, based on reading the literature this seems to be the amp that most people should be building/getting. The cost is incredibly reasonable compared to the (snake oil and charlatan-driven) competition out there.

Well if you're reading his "literature" then I can assure you that the source is a bit biased, lol. Certainly this doesn't diminish the engineering work, the actual product, and all the technical documentation and support on forums he's given for the amp. The results stand for themselves.

I did a very simple audio test with RMAA using the amp and a Creative X-Fi Surround 5.1 (USB sound card), and I got pretty much the exact same results using

Scenario 1: line out -> (no load) -> line in
Scenario 2: line out -> O2 (loaded with a challenging low 32 ohms headphone) -> line in

The first scenario tests the fidelity of the sound card's line out and line in signal chain, while the second scenario also sees the additional contribution by the amplifier when subjected to a real-world load, under which a worse amp would falter. I did test the line out (which has a headphone amp chip for the sound card) loaded with those same 32 ohms headphones directly, the results were significantly worse. i.e. the setup was more or less "bottlenecked" by the sound card's line in when I used the O2, but bottlenecked by the internal headphone amp when I didn't.


It looks like Tyll at InnerFidelity is getting ready to run some headphone amps through the paces with an AP analyzer. He's still working out the kinks, but he posted a teaser image of a few amps, loaded at 300 ohms with 1V, with their THD+N measurements. Post is here
338

That's just THD+N, which by no means is the only parameter to look for, but see all the amps are at 0.002% THD+N or worse. Compare with O2, according to nwavguy on his test gear (full measurements here)
386:
Note: x-axis here is voltage and not frequency. Test is at 1 kHz as noted in the graph.

300 ohms result should be between the 150 ohms and 600 ohms. So the value at 1V is about 0.0007%. Granted, I think at 300 ohms, for many of those amps, it's the noise part of THD+N that dominates the reading, but still...O2 is made using three $0.50 op amps, some fairly ordinary and cheap resistors / caps / etc., a cheapo power supply/battery charging circuit, and a battery/power management circuit. I wouldn't say the O2 is the greatest thing since sliced bread, but that many of the "real" audio / audiophile manufacturers selling headphone amps should well be ashamed of themselves? How come they can't get these kinds of results for their own commercial products, using much more expensive components?
post #10957 of 37667
Quote:
Originally Posted by mikeaj View Post

Well if you're reading his "literature" then I can assure you that the source is a bit biased, lol. Certainly this doesn't diminish the engineering work, the actual product, and all the technical documentation and support on forums he's given for the amp. The results stand for themselves.
I did a very simple audio test with RMAA using the amp and a Creative X-Fi Surround 5.1 (USB sound card), and I got pretty much the exact same results using

Of course, I'm not referring to the marketing hubbub but the measurements.

Certainly there are differences but in terms of finite measurement I'd wager that few amplifiers have the O2 audibly beat in measurable areas. I'm sure there are a couple of expensive headphone amplifiers out there that might beat the O2 by a tiny fraction of a percentage point but it wouldn't be significant enough to be audible by human ears. Power handling might be a different story.
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post #10958 of 37667
Going to pickup a pair of white Q701's once I sell offa few of my cans. Anyone interested in buying my A700's off me? They have AD700 velour pads on them. tongue.gif

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post #10959 of 37667
hmm all this talk of the O2 has piqued my interests, thinking about building a desktop variant from scratch after seeing the relatively simple circuit diagram, i already have an idea for a walnut and mahogany case for it redface.gif

I wonder if i could build a dock port for my e7 into it like the e9 headscratch.gif
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post #10960 of 37667
speaking of fiio.... theres a new DAC coming soon, the E17, also compatible with the E9, but 192k/hz 24 bit
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