oh, ok. Well could you recommend me some headphones that would be able to take advantage of this quad channel DAC?
It only activates on high impedance loads. The problem is that activating the feature doesn't not mean "taking advantage" if that means "making full use of it." Using a 300ohm headphone on a smartphone even with a Quad DAC is still not optimal. In other words, it's like choosing between a 1.3L I4 (regular smartphone) and a 2.0L I4 to power a heavy sports sedan. The lack of isolation on, say, an HD600 just makes that worse.
There are a few exceptions, ie, high impedance IEMs,
but given that they have sensitivity well over 100dB/1mW coupled with good isolation anyway, it's not totally necessary. Not to mention you might not like their response curve in the first place while they can still do reasonably well with any decent though not Quad DAC phone.
Note that this is not to say the V30 is a bad phone for music. It's great. I'm just saying don't sweat over beign able to activate Quad DAC or not - just use it with whatever IEMs you prefer the sound of and know that the V30 isn't that far off from using a portable amp, even without Quad DAC. At worst, anybody who is looking for a phone should get a smartphone based on other features that they would deem relevant, barring of course the ones that really measure badly, or the ones that don't even have a 3.5mm socket.
AFAIK the phone comes with B&O earbuds which I assume would take advantage of this. At least I hope so
Not sure if it does but again, regardless of whether it does or does not, if you like the sound then good. If not, try a different IEM, but not necessarily only the high impedance ones just to activate Quad DAC.
The reality is that it can have a wow effect vs other smartphones (though again it falls short of an actual amp, not to mention at that impedance and design one is likely sitting down at home anyway where an amp is easier to use rather than clogging up pockets along with cables) but very likely it only does that for high impedance (as opposed to being manually activated for lower sensitivity headphones/IEMs at any impedance) so they would still get good battery life on reviews.
Maybe,
maybe, a firmware update allows for manually activating that later when the review cycles are over, but again don't sweat it. Just pick whatever runs well enough from a smartphone and if you like the sound then use that, or if not, move on to another IEM or headphone.