Finishing my thought on the First Watt v Burson Soloist comparison...
A person who loves one is likely to not love the other. I'm in a bit of a huh moment at this point since they are wildly different and neither is 'perfect' for the LCD-2.
The First Watt F3 has a certain softness to it. It's character is steady top to bottom and is very fast. But it's also tight to the point of being passive. No real drive, just easy listening effortless playback. Staging wise instruments are larger without that pinpoint laser focus.
The Burson Soloist is a 180. The bottom is full, punchy, quite alive. The further up you go the more that drive moves towards hard. Cymbals are laid bare, no sweetening. Speed is reduced but focus is much higher which makes things stick out more.
Overall I prefer the Soloist. That it's usable as the pre to my monitors certainly helps. That it's quite a bit smaller and kid safe are also pluses. But I would have preferred that Burson crank up the class A bias to perhaps increase speed and soften the top some. The case is cold even after days of use so there is clearly enough breathing room for more bias. Also the output specs are misleading. Advertising 4W@16ohm unrated while the real usable number is the 1W@30ohm spec has a lot of user and reviewers sadly using it for jobs it's not suited for and walking away underwhelmed.