- Thread Starter
- #101
-3 dB point is 315 Hz so well above mains.@amirm FYI
-3 dB point is 315 Hz so well above mains.@amirm FYI
Ok, I cannot be sure I just don't think a common mode noise voltage would result in much energy at 3x 1 kHz.
On the one hand I know atomicbob guy on SBAF also measures using XLR inputs of the ADC using well shielded balanced-unbalanced cables. On the other hand I assume Amir uses the unbalanced-unbalanced connection to measure a more 'realistic' real-world connection of an unbalanced device connected over RCAs. If Amir has always measured that way, comparisons are fair; to now change the set-up to give a slight advantage and cleaner display of the unbalanced output will make comparisons to other devices more of an apples to oranges comparison, no?
sure, if you use a DAC when lay in a grounded tub full of water, you have a slightly similar GND loop. Normally, you are well isolated from the GND, and doesn't matter grounded PC in use or battery-powered Android. Hence, the most realistic method of measurement is isolated USB source, or isolated AP, or correctly grounded entire setup. As a criterion of how far your AP+DUT setup from an ideal, you can compare that with a battery-powered USB source(Android) as a nearly ideal sample. Using the unbalanced input without isolation is the worst case ever.If Amir has always measured that way, comparisons are fair
That is a good point. A differentiation could be made between that, and simple line-out as currently measured.The point is that this is a headphone output. Not intended to be connected to anything other than a floating, earth-free headphone. Leakage currents etc that are caused by the measurement setup and influence the measurement result therefore do not represent the results from typical use cases.
The one I linked in the spreadsheet is the one referenced in the results. It's also made by Meenova as per the logo on its plugs.There seems to be an error in this spreadsheet. On the top it says 'Meenova (15 cm)'. But the link goes to a no name cable. I found a 'Meenova'
version at this link:
https://www.aliexpress.com/item/100...g0o.detail.1000060.1.441a5ceevO3zr4&gps-id=pc
So which cable is the right one?
MC_RME, my cables usually are XLR2crocodile_clip style.
Interesting link, thanks!
Ivan, so in your own measurements and looking at typical performance, does the 9038D or the 9038SG3 do better on harmonics?
about the same but 9038D has a lower current + opa1622 has higher loop-gein, so it has less load/unload harmonics difference. The best samples have -135db 2nd and 3rd, worst about -123db. If I see really low-performance unit I offer it for a lower price on my Aliexpress shop(need to ask Sunny about such units for -30-50% discount). Also, I have some mistaken laser engraved units, they are 100.0% fine but I was sleepy and made like this:Ivan, so in your own measurements and looking at typical performance, does the 9038D or the 9038SG3 do better on harmonics?