I just hit around 245 hours running it full time. Been an interesting trip.
0-3 hours start-up, VERY warm sound, My helicon 300 MKII's never sounded better. Highs were a hair overly crisp. The detail was good.
70-100 hour point, extension of the bass is gone. High end seems a little distorted. The detail was still present. Listened in 30-45 minute segments a few times during this burn-in time.
157 hour point, the distortion at the high end seems to settle down, imaging was fair.
210 hours, same as 157 with the exception, detail is better.
235 hours, the overly warm sound when I opened the box, is gone. Now the low end is detailed and tight. While its tight, I would love to know what it measures. Im not sure how to write this, I wonder if the output at around 200hz and under, is low under-performing? How do you do a sine wave and measure it?
The mid-range and highs seem detailed and clear. Imaging is good, but, I believe it excels in detail of the music.
I do get the sense that the out of the box wow factor is not as good. With great material, the Dac does a pretty good job. With poor material, obviously not that well.
Most music listening is done with electronic, jazz, rock and classical.
Just got off the phone with my dealer. I have some low freq music. I'm thinking of hitting the Dac with 20+ hours of it and see what the response is.