AnalogSteph
Major Contributor
Same. For SNR re: 50 mV, look at ca. 76 µW into 33 ohms. This gets me ca. 92.5 dB for the Archel2 in low gain mode (correct) but only ca. 83 dB for the THX 789 at minimum gain. Is this because the standard THD+N vs. power test is run with the volume wide open, while the 50 mV test is not, thus reducing input stage noise accordingly (which would make sense when operating sensitive headphones)? That must be a really low-noise input stage in the Archel2 then, much like the O2.@amirm Thank you for the test! I'm wondering why there is around a 10 dB difference in THD+N between the Archel2 and the THX 789 at low power levels, which should just be a measurement of noise, but they are pretty much the same in the 50 mV SNR test?
I would also be interested in a measurement of input clipping level, in high gain in particular.
I think it's interesting that the difference in output noise level between low and high gain seems to be about 15 dB, despite the high gain being a nominal 4X (12 dB). Why would that be?
Yes, the pot would appear to not be quite up the same standard... channel tracking performance seems average at best, quite possibly it's a rather low value like 10k tops. That said, you've got a low (unity) gain mode, you shouldn't need that much attenuation anyway.
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