Skyline, I've been trying to find this out for a while: what makes the Bifrost Uber better to you than the Bifrost Miltibit (Bimby)? Some say the latter is more organic, but that the former has better slam. And to keep this on topic, which pairs better with the Ember amp?
Ah, I never said the Uberfrost was better
This is the exact thing I'm grappling with, in fact.
I had the Modi 2 Uber which worked wonderfully with the Ember. I got the Bimby on loaner and instantly realized my days with the Modi were done. More spacious and more refined. Definitely a laid back and smooth sound which I enjoy, but it didn't sound dead, either. Just enough energy and slam without sounding digital or fatiguing. Very nice.
BUT, the Bimby was way out of my price range, so I picked up a used Uberfrost for $250...$125 if you count my Modi sale. Pretty awesome deal. The Uberfrost sounds pretty fantastic. Perhaps a bit more digital and a tad more congested than the Bimby, but it's not night and day.
Now I'm in limbo, though...my audio memories of the Bimby are a couple of weeks old and I was hearing it after a year of nothing but my Modi 2, so the jump seemed very significant. I never had a chance to directly compare the Bimby to the Uberfrost, though. How much better is it? $280 better? And, just to make my life harder, you have the 4490 upgrade for only $70. How close to the Bimby will that get me?
Anyway, they all sound great with the Ember so the pairing is really a non-issue. I'd feel fairly confident in saying the Bimby outclasses the Uberfrost, but it really depends on your wallet whether or not that's worth an extra couple hundred of bucks.
I know someone who is going to have all three Bifrost versions on their desk next week to compare side by side. I'm waiting to hear what he says before finally making a decision...