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RPG, no not "burned in" But I do agree with after a day or 2 using the ZO2v1 it improved and was a keeper with the sound, problem with V3 is, no burn in will not solve the volume issue
What you mean volume issue? The highest point of the low gain mode in v3 is so it can be used with LOD with IEMs, then it NEEDS to be that silent compared to using HO on your J3, it actually might be still almost too loud for some IEMs with such setup. But ZO2v1 or ZO1 didn't even have this feature, those are just like using high gain in v3 except u can't control the volume in high gain. But the volume control is mostly useful for LOD users, HO users shouldn't need to use it. Look, it's not an easy task to make it fit for every possible config.
But if they want to further expand compability/usability in the future ZO3 for example and to truly cover all kinds of setups in the best way possible, this is what could be done as my suggestion; Add a separate small gain switch to the side somewhere like
this which is separate from the volume control switch so that you can control the volume in both gain modes and possibly even add a "medium" gain with a gain strength that is right in the middle of the current high and low gain which would fit perfectly for IEMs/Headphones volume-wise when using headphone jack with an ohm rating of aprox 24 ~ 64 ohm & medium sensitivity.
As it seems currently like in your case, using headphone out with a higher ohm IEM or a low ohm headphone you get "right in the middle" that doesn't fit perfectly with neither low or high gain. But again, if they made your config to work perfectly some1 else would have to suffer from this instead if only sticking to the current config of the low/high gain. But yea currently if using headphone out and you are a low ohm headphone user or higher ohm IEM user it might mean either you have to use low gain and set source volume to perhaps around 50~80% or you use high gain and have to set source volume to like 10~20%.
I've personally used ZO2v1 from headphone jack and I've always maxed the volume on it (and my source volume is set to 11~15% depending on headphone) as it seems to sound best that way to me anyway so haven't had any use of the volume control, for a LOD user it's a must have though.
Since high/low gain wasn't even a planned feature for ZO2 to begin with I feel you're nagging about something which wasn't planned to be there in first case. But yea remember to send feedback to digizoid (there was a specific email for that) and digiZoid might look into it for future products.
EDIT: To sum up:
ZO2_v1: Couldn't be used as a LOD setup with any IEMs or easier driven headphones
ZO2_v2: Couldn't be used with any headphones with an ohm rating aprox ~80 ohm and higher & medium sensitivity
ZO2_v3: Can be used with IEMs with LOD + can be used with headphones up to a ohm rating aprox 250 ~ 300 ohm but 32 ~ 80 ohm or so headphone/IEM users using Headphone jack on the source is not perfectly matched but still very usable and can be using either high or low gain