On the subject of the QA transformer, I should say that mine has been working without any problems since being replaced. Which is good because even with a modest amplifier it still sounds quite impressive to me.
I need to find a better solution for storing the Float QA. I'd like to protect it from dust when not in use, so I've been using a plastic storage bin. It's a bit unsightly, so I would prefer to find a wooden box and line it with felt or foam.
I find it really incredible how different transformers can sound, comparing the old to the new power supply, which is basically the same thing, just built around much better transformers.
But why are you so afraid of dust? Specifically with the QA box, there are no openings in the enclosure, and despite the fact that I would prefer to not leave it out in a sand storm, I think it's a rather not so sensitive device.
Speaking of amplification, may I ask what you have been trying it with it? The difference between the Quad 405 and the 520 has been incredible, even though they come from the same stable and are pretty similar devices. So I have the impression that stepping up with sources and amplification, the Floats seem to grow and grow and grow with the equipment that they are connected to, without ever loosing their character. That's another thing that is pretty similar to my LS3/5a's. The speakers never changed, but everything else around it, and still I never even once had the feeling like I should think about replacing the speakers. The Floats are the first transducers I encountered post LS3/5a infection that seem to have the same quality to them. I simply could't think of anything better, at least not in a budget that still is within reach and reason.
Edited by Glitterbug - 3/9/13 at 1:21pm