Manfred said he'd reimburse me for shipping costs, thankfully. They seem to be stepping up their game in customer service, responding to my e-mails very quickly, which is good. I feel more confident now.
I asked if he had some idea as to what the issue was, since it seems to be happening with other folks, and is probably due to the design like analogsurviver says. I want to make sure they actually work to fix the issue, rather than just swap my QA for a new set that could develop the exact same problem. He said he'd have a better idea of what was going on after he had them to look at, so I'll wait and see what he says.
What I'm most worried about still is what Sam reported: his second pair sounded lifeless compared to the first. I actually debated ordering a second set in case there was variation among units and the new one didn't sound as good. That's how much I've fallen in love with the sound of these.
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Listening to certain other headphones after hearing the Floats, one really gets a sense of how "closed in" they sound versus the open design of the Floats, what amounts to speaker panels on the sides of your head more or less. Other devices that have similar effects in my experience are the Stax SR-Sigma and Omega, the K1000, the TakeT H2+, and the Qualia 010. With the exception of the Stax however, the Float QA has the best overall tonal balance of these headphones in my opinion. The K1000 and Q010 are a little too bright and the TakeT is a little too bass-heavy. The TakeT also has a very unique sound that is difficult for me to fully articulate and is unlike any other headphone I've heard since, a result of the piezoelectric film methinks. It gives them an uncanny sense of presence similar to speakers. The Float QA sounds more effortless however, a trait more in keeping with electrostats.
I am curious to finally try the Precide ERGO AMT, since it shares some lineage with the Floats. It uses a totally different type of technology in its drivers, which actually put it closer to the TakeT than the Float QA. From what I gather however, the ERGO AMT is very bass light unlike the TakeT and Float QA. All three of these headphones need a dedicated setup to sound best though, and the dedicated amp that Precide makes, the Model 2, is said to bring the ERGO AMT up to another level of performance entirely. It's very expensive however, costing almost as much as the whole Float set just for the amp.
I'd love to compare the Float QA, ERGO AMT, and TakeT H2+ side-by-side however.
I was speaking with some folks about a possible partnership between TakeT and Fidelix, which Currawong mentioned in his headphone festival impressions, and it seems like it's going to happen. They'll be offering a dedicated H2+ amp, which I'm looking forward to since the TR2 really limits their potential.