Interesting. Are you achieving that with Jabra's EQ? I'd be interested to try that out. 100% agree; they're almost muffled with the stock tuning and SoundID (or whatever they call it) didn't help.
After I say this, I may never be able to even
buy another ADV product, let alone review one...
If you're choosing a pair that you will only listen to (that means you don't care about call quality, range, app support, firmware updates, etc), then the ADV would blow you away. I get a wireless listening experience that is almost akin to listening to my home stereo with the subwoofer on (in terms of FR). It has stunning, and I mean
stunning detail retrieval in the mids while never feeling delicate. There is enough treble to create a convincing stage, but it never hurts, even on bad masters. This pair simply rocks in terms of sound.
My concerns lie where I previously stated; in practical use. I really hope ADV provides a satisfactory answer to my email. That's as much as I'm comfortable saying right now.
The closest match I have to it is the Cambridge Melomania Touch. As
@samandhi recommended, they should be a pretty close match to what your ears prefer and the in-app EQ can quite literally be cranked to the max, positive or negative, and not crush the sound quality. It's really impressive.
The MT had a rough start; I bought them simply because I already owned one of their phono stages, was Jonesing for some of the higher-end stuff, and found out they made TWS. I don't think I'd have ever taken their CEO up on that offer to send him any concerns (his email is printed directly on the product box) if I didn't hear some potential in that set. So glad I did. So happy with how much they've improved.
Solid recommendation from me. We are here to help overcome the initial hurdle to enjoying them if you choose to do so.
To start, I sincerely hope you don't intend to go swimming with any of these. Rated or otherwise, that's a very harsh environment to create for your ears. I'd be terrified of water-logging myself.
On the battery drain, it's not an issue at all if they're your only pair or you're using them daily. Where it becomes a problem is when you put them away charged, come back a week later, and find out they're completely drained. I have to think something funky is going on with that Panasonic/Technics firmware that's causing the drain, but it takes a very long time to become a perceived problem unless you're someone like me who already has way too many pairs to rotate through.
I think the Sparks could turn out to be a pretty cool little device. Moondrop has a unique aesthetic and an established reputation in the IEM market for very intelligent tuning. They also make regular rounds through the product threads here, which is always nice to see. What concerns me is their overall size. On the official Moondrop thread, there's a lineup that includes the Spark next to other members of their lineup. They do seem slightly larger than the Kanas Pro, which are already hitting the limits of what my ear shape can handle. For that reason alone, they may not be a wise choice for me.
But I completely agree with you that that they could be an amazing pair for the right person and I applaud Moondrop for taking the risk. I look forward to seeing some impressions here!