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PhantomRex
3
Oct 2, 2018
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Just got my O2 Amp: Desktop Edition. (Medium gain, 1.1x, 110V for the US). And I am a bit puzzled - no manual of any kind? I guess I can search for O2 headphone amp manual online, but that was a bit puzzling! Is that usual - to have no manual included (or *any* documentation of any kind)?
Thanks.
Oct 2, 2018
PhantomRex
3
Oct 2, 2018
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Did I make a mistake? The input *seems* to be analog left and right. Is that accurate? Isn't there a single input? For example, from say FiiO X3?
Oct 2, 2018
Keth
701
Oct 3, 2018
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I mean it's not complicated, the analog inputs are both labeled and use the standard color coding for RCA inputs.
Oct 3, 2018
PhantomRex
3
Oct 3, 2018
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, thanks for your reply. I appreciate it.
I don't need to use a DAC because I will be using the FiiO X3 as my input for music. (There was a big discussion earlier about that). And I have seen the original non-Massdrop produced O2 - it *does* have a single digital input from what I can see/remember. That's why I bought the O2 from Massdrop. Does that make sense?
Oct 3, 2018
Keth
701
Oct 3, 2018
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The stand alone amps doesn't have a digital input, without a DAC it wouldn't be able to convert a digital signal to something headphones or speakers can use. Because of the license under which the O2 was released, manufactures can't add features to it beyond minor modifications for parts availability. The mainboard exists in two forms, a dedicated amp, and one with a daughterboard slot for an added DAC. Only models with the DAC will have any form of digital input.
Some of the O2 amps use a 3.5mm input instead of RCA's, perhaps that's what you're thinking of? This was the original design, before the
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input and power was moved to the back.
https://cdn.head-fi.org/a/9980003.jpg
Oct 3, 2018
PhantomRex
3
Oct 3, 2018
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, aaah! That makes sense. Thanks. I just checked on the JDS Labs website and the single input is INDEED an analog input - not digital!
So, additional questions then :) These are my 2 MAIN usage scenarios: 1) HiRez audio (for now FiiO X3 is what I am going to keep using) 2) Listening to TV through headphones when the house needs to be quiet :) Receiver: Denon AVR-4310CI

For scenario 1 (hi-res music), I currently use FiiO E6 with FiiO X3 - along with the Sennheiser HD 6xx. This is what I am trying to improve, if possible - within reason :)
I tend to use my Shure SRH940s for the 2nd scenario usually (TV listening). I do use the Shure for music also :)
(I also do own an Audio Technica ATH M50x - just FYI).
Thanks so much, again!
Oct 3, 2018
Keth
701
Oct 3, 2018
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So wait, what was the question?
The X3 has a line level output capability, which is what you need to use with this...from what I've read it's a higher than average line level so expect to keep the volume setting low.
Your Denon has multiple audio outputs, you'll have to check if the VCR, or DVR outputs are line level....they should be.
Oct 3, 2018
PhantomRex
3
Oct 4, 2018
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Thanks again!
LOL, yes, the question seemed to have gotten lost in there somewhere.
So... I do use X3's line level output (and use the FiiO E06's line level input) with the Senn HD6xx - using E06's headphone output. And it sounds good. I was just hoping to make that sound better, if possible - within a reasonable cost. That was the main question! :)
That's why I thought that the JDS Labs' singular input might be useful for me. Well, as it turns out, it was/is analog. But, it still isn't present on Massdrop O2 (the single input). Of course, that could be fixed easily by buying a 'stereo breakout cable'. But then I will have to use X3's headphone out and not the line-level output, right?
In addition, I wanted to see if I could use the HD6xx with my receiver and what I needed for that. I will take a look at the line level outputs for receiver. I guess until now I was using the 'headphone out' on the front panel - not the smartest move on my part :(
Thanks, Keth!
Oct 4, 2018
Keth
701
Oct 4, 2018
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It was fine to use the headphone out on the receiver, they just tend to use cheap class D amps compared to standalone models, with exceptions on specific models.
All you need is a 3.5mm male to RCA male adapter. The hardest part will be find a short quality male to male adapter that isn't ridiculously priced. Super easy to find 6 inch male to female cables, but not male to male for some reason.
Oct 4, 2018
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