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(love you guys, keep up the good work!)
For those who are curious, the iBasso DX200's output impedance is definitely below 0.5 Ohms with the stock amp module it comes with. I'll probably post the measurements here in the next days.
I'd also love to know iBasso PB3 amplifier output impedance, and FR response unloaded and loaded with critical IEMs. Just to check if there is some highs roll-off unloaded, like iBasso D14, and to check the behavior of that super capacitor with a low impedance load.
I've purchased a decent ADC at last (E-MU 0404 USB), and its line-out (flat extended low noise) could be used when paired with the right amplifier, to measure all kind of IEMs (so I ended the search of the ideal USB DAC to measure IEMs, and the seek for the ideal amplifier has begun).
If a PB3 falls in your (all subscribers of this thread) hands, please measure it.
iBasso DX200 (stock "Amp 1" amplifier module, single-ended output):
No Load (Filter #4):
Loaded (Filter #4, Ultimate Ears Triple.Fi 10):
iBasso claims around 0.3 Ohms (both for the single-ended and balanced headphone output) - seems very plausible.
Digital Filters (unloaded):
In addition to @hakuzen's xDuoo X3 measurements, here are mine with the Triple.Fi 10 and the addition of a measurement of the Line Out:
xDuoo X3 (RockBox):
Headphone Out, No Load:
Headphone Out, Triple.Fi 10:
Hey guys, just a quick question - where is the option to move graphs up and down on the Y-axis? I knew that I once found it but cannot find it right now.
///edit: Nevermind, found it.
Hey can somebody recommend some dirty cheap ba iems which impedance varies a lot?
So far I've found these, don't know if there's something at a similar price that varies even more: http://reference-audio-analyzer.pro/en/report/hp/kz-zst.php
my cheapest is an old sony XBA-c10 and I had it for a massive 30$!!!!!!! ^_^
I checked but the never used or damaged stuff I have around is all with dynamic driver and really small or no impedance change at all. maybe someone not far from you would give a damaged BA IEM for the cost of delivery? as long as one driver is making noise, even if the nozzle is crushed or one side is cut off, that would probably still be fine for your intended purpose.
I thought I still had one xba1 driver(I ruined the other one trying to solder a cable on it...eat the surface they said...), but I can't find it, probably went to the garbage to hide my failure. if I can find it and it works I'll measure the impedance and come back to you, but don't hold your breath.
Cowon Plenue 2 (single-ended output):
=> Very good 0.6 Ohms output impedance, as also stated by Cowon, confirmed.
All Digital Filters:
Finally found the time to post my measurements...
PS: The Plenue 2 is a delight for all people who are generally sensitive to perceiving hiss and are using very sensitive IEMs. It even somewhat outperforms my beloved iBasso DX90 in this regard, whom I considered to be the best standalone DAP with low output impedance when it comes to being hiss-free with super sensitive IEMs.
PPS: I'm personally really not sure what to think of Head-Fi's new design and layout (well, I actually am, and while I don't think anymore that it sucks as much as I did when they switched over to the new infrastructure, I better shouldn't comment about it in public as what I'm thinking of it is not so nice (imo they destroyed the user experience and ease of navigation)).
iBasso DX200 - AMP2 Module:
Unloaded (Filter #4):
Loaded (Filter #4, Triple.Fi 10):
Frequency response + KZ ZS5 Locking Good!
Noise level + KZ ZS5 The Noise Locks even better den Unloaded!
THD + Noise (at -3 dB FS)
Thanks, I've added it to the overview in post #3.
Avantree Clipper Pro (Bluetooth 4.2 aptx low latency clip-on)
Not bad for Bluetooth, the sound is a bit cramped at the topend because of the high frequency filter. The Output Impedance is abut 5 Ohm.
Frequency response + KZ ZS5
THD + Noise (at -3 dB FS)
Mass Fidelity Relay (Bluetooth DAC):
Sony XA + KZ ZS5 And KZ ATE
The Sony XA did not work with just the soundcard load, so i used the mild 16Ohm Load of the KZ ATE.
The heights on this Phone Sound amazingsingly Crisp and Detailed without getting Aggressive at all, Amplified with Low OutputImpedance of course.
OutputImpedance about 40 Ohm.
The crosstalk is just about OK.