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First off something I've written on Hf so many times I can't count, volume level and power output have nothing in common. Volume level is just gain which is the easy bit, current is the hard bit. In setup A you have the lower than normal gain of the BHSE plus the super low output of the Neko which means the volume has to be pushed to the max. The amplifier isn't running at max or even close to it as any headphone faced with the full fury of a BHSE with a high enough input will not be long for this world.
As for the BHSE being bright, it isn't but the SR-009 is. If the BHSE really was bright then phones such as the Lambda Signature and HE60 would be unbearable on it but they aren't. It would also sound vastly different to all the other Blue Hawaii variants and the SRM-T2. This isn't the case and the Neko also has a reputation as a darkish source so where does the blame sit? I know the Stax community at large is not happy with the 009 and it's widely considered a lemon, same as the SR-007Mk2 and the SR-404 in the 90's. The engineering puts all other headphones to shame but they really should have stuck with the older diaphragm material.
As for the WA5+WEE, I've heard that and it's scraping the bottom of the barrel.
I kind of agree here that the 009s are inherently bright, but, like with bright speakers, complementary (warmish) amplification, interconnects, and power cables can work wonders.
So even though they may be inherently bright, they also are inherently great.
They are Heaven on earth actually to my ears for what they do right.
OK, they could have more thunderously exhilarating bass like I hear with LCD3s, or incredible layering like I hear in R10s,
but with the brightness issue addressed, they have a great combination of humanity along with extreme detail, more so than the R10s (which were my main phone for years),
which seemed a little analytical in the way they separated each sound from one another when I felt a little blending to the air around them was more like real life.
I use a Stax 007t/ii amp for the 009s, and need to use a forgiving 10 year old Shunyata Anaconda VX power cord on my EMM cdp to warm up things.