This thread seems to have quieted down. I hope it is not due to a lack of interest in the XM6. I just received one after it took a week to get to San Francisco and another week to navigate our city's distribution center
. Too early to give a definitive sonic review, though I will provide my first impressions. I got the XM6 w/ 8741 with both the BUFF634 option and the DoulbeCat AD8397 option.
First, the pictures do not do the construction justice. The fit and finish are first rate. All edges are nicely beveled and everything is perfectly aligned. Since the mini-jacks in the front have an insulated collar and the hole is precise they have great support not relying solely on the board mounting. The volume control tracks very well all the way down and with its metal shaft has a smooth quality action. Though the manual warns about transients, during power or plugging operations I have yet to experience any of significance through my HD700s. I will be trying others over the next few weeks including my UE Triple-Fi 10e's.
As a USB DAC into my Macbook Pro, all functions work without any setup including the clever joystick. Some had complained about the crossfeed controls lack of knob. By using my finger nail on my thumb against the flat edge, I can make fine adjustments without resorting to tools. With my HD700's there is plenty of gain and I find that the control is in the 9-10 o'clock range in low gain mode. Initial impressions on the tone controls has the bass boost extending into the mid-bass area too much (80-120Hz) which impacts vocals and bloats the bottom end. I am sure some will like this but at this point in my break-in, I don't. The treble control is more subtle and adds a bit of "sparkle" and "air" to the top end but right now I am enjoying the flat setting.
I have done less listening as a standalone amp connected to my Oppo BDP-83SE, but what I have heard so far is very clean and engaging with excellent imaging. In fact it is hard to write this as I am listening and keep getting pulled into the music. While not inexpensive my first impression is that the XM6 is an excellent value considering it sound, features and flexibility.