Always Sounds Great...
Don't worry about it. jamato8 has a very heavily mod DYI WA6.
After a few minutes of warm up you should be ready to go, at least that's all the time my WA6SE max takes.
However your new WA6SE max will take a few hundred hours to really reach the sweet point and start to stabilize. But after about 50 hours it will start to sound very nice.
But... it sounds much better... after its warmed up for a couple of hours, or so - much more detailed, with a more open, airy, 3D sound stage.
I've only got about 150+ playing hours on it - so, it may be much more stable after a lot more burn in (with less variation in its sound as it warms up).