@warrior1975
To me, the Ref1 is my favourite ever, but I will try stay objective.
Bass on the Ref1 is massive by anyone's definition. It hits harder, deeper and has more texture than the Jupiter.
The Jupiter however has a decent amount of impact and volume for a BA iem. It certainly isn't lacking. It is faster and more nimble than the Ref1.
The mids on both are overshadowed a little by the bass. However are tuned quite differently. The mids on the Ref1 give a very unique presentation imo. The mids on the ref1 are more emotive to me, lending well to acoustic guitars and instruments, where by comparison the mids on the Jupiter are more dry or cold. The vocals however are quite sweet on the Jupiter.
While both are overshadowed by the bass, the Jupiter is less overshadowed by bass, however it is also overshadowed by the highs.
The highs on both are very detailed, both are non-fatiguing, but VERY different.
The Ref1, like the Rosie takes a darker approach. The details are there, but they are not in your face at all. They are presented in a natural way for you to hear. And with a nice clean powerful source, there are BAGS of detail.
The Jupiter has a sparkly, hey look at all this detail I have for you kind of treble. Which is nice sometimes, and makes it seem more airy than the Ref1, but can also make it sound artificial. Something the Ref1/too I had NEVER suffered with.
They are very different beasts. Being someone who loves the ref1, I usually steer clear of presentations like the Jupiter, but it is done well enough that I enjoyed it quite a bit technically, but I couldn't connect with it emotionally.
As far as soundstage and separation is concerned, think of the Jupiter as a studio, Ref1 as a Concert Hall. Separation is comparable, though I feel the Ref1 is more coherent in being able to separate but present as music.
Sounds like I am canning the Jupiter, but honestly, it really is very good. I just find the ref1 not only exceptional, but perfect to my tastes as well.
Not to mention the Ref1 has an optional cable that costs more alone than the Jupiter does with a beautiful Litz cable included.
I must also say, I heard the Jupiter with the Tinsil cables and I believe the new models come with a superior cable.