Hi, Dan.I have a question regarding this. Hopefully, it's not too ridiculous.I take it you have aligned the pleats with the magnetic array so as to minimize distortions, which is great, but how do you account for the variable magnetic flux?Also I'd think the absence of THD in a measurement rig only means there is no significant resonance/excess vibration issues, but may not give much insight into irregular non-linear diaphragm response. Though I could be mistaken.
I accept it measures poorly on your independent rigs. I do wonder what these independent rigs look like and how they work, and because the quality of the rig affects results I shared some of our own experience. Surely if you're going to publish test results you should share your test system. Being able to reproduce results is the central tenet of science, yes? The simple fact that you're hearing major problems with this phone to me says there's a problem that needs to be fixed. I'd appreciate seeing some of the test fixtures and how they work because it will help me, and others on the forum, understand the results better, and maybe reproduce them.
Hi Bill, long time! Variable magnetic flux is a reality in all planar drivers; if the flux becomes too nonlinear it compresses the extremes of the excursion, which shows as THD. Basically, if the driver is operating non-linearly in flux you'll see THD. Resonances may or may not show as THD; if you have a perfect oscillation at 1K it will show now unusual THD but the time domain would look bad.
I can't help but wonder if that's why this specific pair of Alpha Prime is acting up, though. I heard the previous pair, and I think there was something weird going on in the midrange. Would you mind sharing exactly what was wrong with it?
Yes. Both sides of the headphone were missing a key gasket. One had bass rolloff starting at 40Hz, the other at 80, with imbalance in the mids and messed up transient response, it was off by about 4 dB in places. But I obviously missed something else, or something failed when I shipped (I think this unlikely).
Not sure what you mean about "you should share your test system". You have seen and used my test rig. We've measured your cans together and got repeatable results (until you moved the cans with the mic too close to the pads). And we have gone through this "quality of the rig affects results" before as well, when results don't paint an amezeballs picture about your products.Not sure how all these claims on your side will help you get to the root cause of a likely faulty headphone and perhaps an entire headphone line.
the question in the back of everyone's mind - and everyone's BS detector is going off right now - but let's give dan the benefit of the doubt. this headphone was already sent back once - how many more times do we need to send it back?i suggest this:1) ultrabike keeps current pair2) dan sends ultrabike new pair3) marvey or someone else here get a random pair in the field to send to ultrabike.4) send all three pairs to some trusted measurers / ears around here: marvey, hans, etc.
