hummm. that one is difficult for me as i only have a Koss Porta pro as secondary headphone.
What i tested (but in a hurry and will do further testing once i have more time) is:
N3>3.5mm jack in aux-Xduoo (on aux setting)>HD600 only amp of the Xduoo (i don't like it, sounds to loud not very clean/precise)
The best use of this combo (for the moment, as i have to find a coax-usb-C cable for the optical connection) =
N3>3.5mm jack in aux-Xduoo (on USB setting: same as above but you select the medium setting in input- i thought i would need a usb connection but it works via the 3.5mm jack)>HD600
I think that uses the DAC+AMP of the Xduoo and i love its sound (but can't say if i prefer it vs the N3 alone as it's already very good alone when i test it with my HD600 without amp: great clarity and precision)
And there's a great deal of settings i have to explore (DAC filters: sharp/slow roll-off, Short delay sharp/slow)
The N3 can drive headphones until 200ohms (and my hd600 doesn't sound ridiculous at 90% only with the N3) so if you have a pair of headphone that are under 200ohms impedance, the N3 is a really great solution (I love it with my Porta pro too, less details and clarity, great dynamic and fun V-shaped sound...just didn't test it with the Xduoo)
Did you set the N3 to Line out mode when you connect the N3 to your XDuoo? If yes, you are connected in Line out. If not, you are Phone out mode. I can confirmed that you are not connected to digital output from N3, so you are using the XDUoo as a headphone amp. only.
In either case, you are not hearing the best of N3. The line out mode is N3's weak link when compare to phone out and digital out.
Can you clarify. I thought the line out , while sharing the same 3.5mm port, came from an output prior to the headphone circuit. Is the line out really just the headphone amp output on high volume?
This is the functional framework of N3, you can consider the line out signal as a fixed 1.0V output from the headphone output, and the signal has gone through exactly the same stage of voltage amplification and current amplification stage as the headphone output, so I agree with you that its not as clean as a dedicated line out straight from the DAC output.
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