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Typhoon859
141
May 14, 2018
Can this do line-out or the sound has to pass through the headphone amplifier? Thanks!
I mean, I guess at a maximum of a 48KHz output, the DAC isn't that great either :/
Pierre111
413
May 14, 2018
Typhoon859It does "pass trough" the amplifier. Altough the amp is designed to act as a line out when connected to the very high impedance of a line in. It is in fact a line driver. Much fuss is being said about the double amping concept. In fact most portable device don't "double amp" The input impedance of a line in is as high as 50K ohms, technically the amp doen't amplify anything in these conditions. You will have a very clean, distortion and noise free signal when connected to an aux input.
Typhoon859
141
May 14, 2018
Pierre111Yeah... I've noticed VERY clear differences between connecting the headphone out and line out from the same source, whether it's with FiiO amps or with iPhones and older iPods which had the line out adapters.
What's funny is that, if what you're saying is true, that would mean the signal you're getting from this is the furthest thing away from "clean", given that you'd be getting essentially what's listed in the specs. Not very good...
Pierre111
413
May 14, 2018
Typhoon859Not exactly sure what you mean. We use a chip that has the dual function of being a line driver and headphone amplifier. It's a Max97220. We supply a line level output when connected to a line in, no need for an adapter. Different headphone output behave differently. It will not distort your line in even at max volume and the distortion figures remain true in that situation. You are totally allowed to put forward the impression that it's not good without hearing it but at the end of the day it's a guaranteed Item so if sound is not up to ones standard we take it back with no justification asked!
Pierre111
413
May 20, 2018
Typhoon859Just to make my point clearer, at max volume we have a output voltage of 2V, (we are the only device of this kind that do 2V on single ended. 2V IS the line out standard. The class AB amp supply the current, if needed for headphones, and to be able to keep linearity of power when impedance goes down. so you do have a line out. Basically a line out is 2V-noPower-no current because the line in impedance makes the output power neglectable. For example, Most smartphones output are around 0.7 V. This is not line out standard.
Typhoon859
141
May 20, 2018
Pierre111Where did I make any claim? When I'm talking about distortion, I'm talking about perceivable THD. I'm saying that apart from differences in output and input impedance, there are differences in the specs of the output of a DAC (line) and a headphone amplifier. The specs are listed for the headphone-out, which aren't sufficient for me (they couldn't be in any case for such a price). However, if hooked up to a different amp, it could be fine, and that's what I was trying to determine from the beginning.
There are many ways to implement such a full circuit, but if the output at the end of the day runs through the entire amp section of the circuit, it will influence and lower the fidelity of the sound. It won't perform better than a dedicated amp, and I was looking for a great device like you're which taps the circuit straight from the DAC. I'm not as interested in the actual line level.
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