Well I had an interesting gaze into the quality control struggles at Audeze.
I purchased the EL-8O at my local dealer a few weeks ago. Sadly, when I received them there was a small crack in the headband. I didn't notice it until the next day. So I bring the headphone in, the store orders a new one and lets me hold on to the current pair as the drivers work and the crack is minor. It's awesome that I got to keep jammin' while waiting for the replacement. When they arrive I am glad, and I give the store the old pair.
After I get home I realize that the left channel is completely gone, so I return the headphone the next day.
They gave me the current pair just today pair, and it's perfect.
Some things I noticed between the three pairs,
- All three came in the white outer box with a black inner box, with no carry case or carry bag.
- The first two came with one long cable, about five or six feet but the third came with two; the same long one, and one with an iPhone mic and buttons, about four feet long
- the first pair had a white certificate of authenticity folded in half measuring about four inches. The next two pairs instead had a credit-card sized certification card with a nice print
- The first pair of EL-8 had an extremely tight headband, very difficult to adjust, but the second pair had a pretty loose adjustment, still tighter than the Oppo PM-3 but close, while the third pair tightened up a little bit but nowhere near as tight as the first pair
- The first defective pair was dated 26th of January 2017, the other two were not dated but they were clearly pretty fresh
Another interesting thing I have to mention is burn in. I didn't know that there could be so much of a difference in when you open the box vs after hours of listening... how the headphone changed! I am talking about the first pair. It seems the two newer pairs were already burned in. They must really read this forum. Needless to say, I am now a believer in burn in - at least for moving parts like whatever all this planar magnetic or a dynamic driver pushing air, vibrating - I do not believe a solid component or digital signal can be changed so easily. I believe cables can make a difference, but only because the electrical resistance of the cable changes with factors like strand width, AWG of the cable, etc. Rant over
Anyway yeah EL-8O. Sounds beautiful. I don't notice the apparent 7kHz reduction I have read about. Maybe Audeze eased up on that type of tuning - that might be impossible, I won't pretend to understand the technology here.
Apparently they are constantly tweaking this headphone.
As long as I can keep jammin, this is the sound I want.