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Once again thanks to Amir for the measurements. I gotta skip a few more meals. ;)

LM317 is not Low Drop Out, it requires at least 3V margin to work properly. That being said, do not put ceramic cap or low esr cap at the regulator output.

Normally I would measure THD+N vs Frequency with LPF 22kHz. Such measurements are very common in datasheet, eg TI.

They both uses 1kHz. The NAD have better spec in terms of power. Both THD+N for both graph are quite similar if ignore it's max output power.

That's the LC filter response with different load.

The dac are different, some dac requires additional low pass filter so that will effect the sound. Then you have the output driving stage at the line out, some cd player even uses discrete circuit.

I would disagree that power amplifier are least reliable due to high V & I. Statistically it depends on how good that company's design, their QA and manufacturers' process. Even though with 2 of their products having design failure, I applaud them for their willingness to come out designs that...

I did not have AP555. Haha Objectively AK4377 wins in the THD+N department.

By the way, here is a cheap 7Hz 71 dongle (bought for $19 including shipping) measurements that have one of the lowest thd+n with load: 300 ohm Gain -1dBr THD+N 1mW 0.0004% THD+N 2.5mW 0.0005% Best THD+N 0.0004% Crosstalk -106dB Noise 0.9uV (0.7uV Aw) Max Power...

@Blorg You can't even read the graph properly. The ASR measurement is base on low gain and you go compare graph base on a different gain. ASR low gain max power is 5mW. Wolf's result is above 1W. The only comparable result of 1W in ASR is high gain. You also have a reading deficiency, 0.001%...

It's above 0.001%, reject. If it's line touches 0.001%, then I will look into it's 16 ohm capability. It's not capable to drive 16 ohm below 0.001%, reject. This is the dac amp that I would prefer...

Once lost then lost, I already got other new IEM which sounds better. Sadly the EP-630 is a good iem to test noise. Why must I try the Dawn? As long as the graph shows it does not meet my requirement then I'll give a pass. It does not meet my requirement of 0.001% HD+N at 1mW or below. Your...

The EP-630. Low impedance (12 ohm I think) and very sensitive. I already lost it so If you want to listen to noise, you may get something similar in the market. Performs better that what? I already have an AK4377 EVK, for 16 ohm load: THD+N at 1mW 0.00095% THD+N at 4mW 0.00066% THD+N at 16mW...

Dac amp must be tested with load, not no load conditions. There's no point for you to kept repeating if you don't understand what my requirements for an amplifier. As long as dac amp can match 0.001% at 32 ohm 1mW (which the AK4377 can), then these are good amp by my standard. What for I go...

I have an AK4377 EVK which I already lost it. As long as it can drive 32 ohm to my requirement, then I am very happy. Able to drive 16 ohm properly is a big plus. Above 2uV noise can be heard with low impedance high sensitivity iem, that's is why I spec thd+n 0.001% at 1mW 32 ohm.

Enob is multiply by 6.02, to be exact. :)

A good DAC amp can drive 32 ohm 1mW at 0.001% (or below) THD+N, this will indicate it has one of the lowest noise. Reaching 1Vrms output is also consider good. Needing anything more voltage is due to some specialty HP. Sidetrack on 16 ohm, AK4377 can achieve 0.0005% thd+n; Dawn does not.

Cannot drive 32 ohm properly. There are others which will perform better.

That's not true with good LDAC analog out product.

Let's compare price. A good wired dongle via usb C cost less than $50. My preference would be base on AK4377 DAC; if design properly it is possible with SINAD 108 at 10mW with 32 ohm load. A quick search will show $35 from 7Hz. My favourite IEM is the 7Hz Salnotes Zero costing $23. Now, tell me...