I like Vanda99 (great review BTW) own both the iBasso DC04PRO & picked up the Onix Alpha Xi1 last week. I am running both with a Motorola One 5G Ace phone with no compatibility issues.
First thing I noticed on the hardware end is that the iBasso top volume button increases the volume. On the Onix the top volume rocker lowers the volume. Opposite of each other. Not a big deal but need to get used to it.
The filters on the iBasso UAC app (green picture) affect the sound more than the filters on the Onix. In addition on the iBasso I can change output from normal to turbo which gives the sound more punch & the eco mode when on warms up the bass but also makes it looser. More adjustment on iBasso is a positive there.
I can hear the different filters on the Onix but it is more subtle.
Also I use the USB Audio Player Pro app (3rd Pic) which has a setting for Bit Perfect audio. That setting bypasses the phone volume & give the cleanest most accurate sound (it also bypasses any eq so if I want to use eq I have to turn off bit perfect). Problem is with the Onix the phones volume still works, which may mean the Onix doesn't allow bit perfect sound through this app. Not sure but when the iBasso is connected the phones volume is bypassed with Bit Perfect on.
Curious what others have experienced when using USB Audio Player Pro with the Onix.
Vanda99 is hearing what I heard on difference between both. He has good ears.
iBasso sound pluses:
Definitely sounds more punchy and dynamic. The high end is more prominent without being bright. I think there may more detail on cymbals up top than the Onix. I do like the crack of the snare more and overall the iBasso sound more alive, like a live recording not studio.
Good soundstage but definitely closer to the musicians sound. More upfront. Like row 10 at a concert.
iBasso negatives:
Not as detailed as Onix. Onix is more nuanced in small details.
Smaller soundstage but acceptable.
Less analogue, more like good digital.
Onix sound pluses:
Warner more intimate sound.
Bigger soundstage.
More balanced across the frequency (other than a slightly rolled off high end)
More detail in mids. More nuanced.
A little tighter bass.
Onix negatives.
Not dynamic enough. Sounds a little flat compared to iBasso.
High end rolled off or sweet sounding but missing some details there.
Midrange doesn't pop (dynamics again)
Soundstage is mid to back hall (not a negative but a preference thing) Depends on where you like you seats!
I need to crank volume to high 70s into 80 on my Artti T10 planar iems on the 4.4 jack. iBasso definitely has more gain.
Does Onix beat iBasso. Yes & no. At this level it's a preference thing, but I do believe I need to break in the Onix more (& I'm one that can hear the improvement of breaking in equipment)
Will see what more hours do with the sound on the Onix.