Okay, I guess we all know there is no DAC under that model name of QV7658H, but it is not uncommon for Chinese DAP manufacturer to remark their chip in order to confuse buyer. Since @redfx already provided us with a picture of Moonlight Z1, we can safely assume both Z1 and G1 are probably coming from the same OEM. It is also not uncommon for Chinese DAP maker (especially the cheaper one) to source their PCB from an OEM that already did all the actually designing. Most of the time DAP maker just tweak the PCB a little and claim they are the designer, but they are really not. For example, company like Newsmy really doesn't know how to (nor capable of) design CPU (or SoC to be more correct), even though it might claim this is their own design. Again, it is pure marketing.
Now lets go back to the DAC itself - it is a 20 TSSOP package - there are only two DAC of such package that are commonly used, the Wolfson WM8523 and TI PCM51xx series. First of, given we already know they claim it to be a Wolfson, and the fact that Z1 is using it, the chance that it is a WM8523 is pretty good. After all, it is unlikely for Newsmy to tweak the PCB that much (as changing DAC from one brand to another requires total redesign of the whole PCB). Secondly, I can tell from the PCB layout (by looking at which DAC's pins are connected to which components) that WM8523 is probably the one in use, since PCM51xx series pinout are very different. So the conclusion is, it is a WM8523, being remarked as QV7658H by Newsmy to confuse people.
Now the funny part is that a single OPA2134 (which is a dual channel chip) should have been enough, but instead the designs calls for two OPA2134, which appear to each driving a single channel. I can't really tell the detail from the PCB picture, but if it is indeed using one OPA2134 to drive one channel, that mean it might have double the power (compared to one OPA2134 driving both channels). In any case, OPA2134 is known for its low output impedance (0.01ohm typically), so that shouldn't be too big of a problem (assuming Newsmy didn't add more resistor at the end).
Now lets go back to the DAC itself - it is a 20 TSSOP package - there are only two DAC of such package that are commonly used, the Wolfson WM8523 and TI PCM51xx series. First of, given we already know they claim it to be a Wolfson, and the fact that Z1 is using it, the chance that it is a WM8523 is pretty good. After all, it is unlikely for Newsmy to tweak the PCB that much (as changing DAC from one brand to another requires total redesign of the whole PCB). Secondly, I can tell from the PCB layout (by looking at which DAC's pins are connected to which components) that WM8523 is probably the one in use, since PCM51xx series pinout are very different. So the conclusion is, it is a WM8523, being remarked as QV7658H by Newsmy to confuse people.
Now the funny part is that a single OPA2134 (which is a dual channel chip) should have been enough, but instead the designs calls for two OPA2134, which appear to each driving a single channel. I can't really tell the detail from the PCB picture, but if it is indeed using one OPA2134 to drive one channel, that mean it might have double the power (compared to one OPA2134 driving both channels). In any case, OPA2134 is known for its low output impedance (0.01ohm typically), so that shouldn't be too big of a problem (assuming Newsmy didn't add more resistor at the end).
