Those of you who are looking for custom cables for you Sine, the choices are far and few between, but I got what I think are the best ones from headphonelounge.com (Ted Allen). I chose silver T2 cable and balanced 2.5mm connector. Here are the pics:
http://www.head-fi.org/t/695297/the-new-headphone-lounge-thread/630#post_13253840
I am pairing the Sine with my AK380/AK Amp stack in balanced mode and sound is terrific! Overall I would say the sound is balanced with just a slight bump in the lower mids/upper bass. Sound stage is good for on ears. Tonality I would say is more organic and not analytical. Acoustics and vocals are outstanding.
An interesting note is that the cipher cable only draws about 50 mA and max 5V from the iPhone, yet plays with plenty of volume. On my AK amp, I have it on high gain and need the volume to be around 80 out of 150 to get to a good listening level. The AK amp maxes out at 8V so not sure how the cipher cable is able to produce the power that it does. Sound wise, cipher cable is good but pretty loose in the bass and harsh in the upper end. I used the EQ app to reduce those flaws and got a good sound. Of course the new balanced out of my AK stack take the Sines to an entirely new level and shows that Sines can scale up pretty well.
I never liked the Audeze house sound because I found the treble too laid back for my tastes (pre 2016 models) but the Sines are not typical of what I remember with the Audeze main line. The Sines pack very well for travel and are a great choice for portables. Unfortunately, as I mentioned in my previous post, the sound isolation (external noise) is mediocre so that is the only criticism I can think of. Given the price, these should be high on the list for anyone looking for reasonably priced high end headphone. I also owned the Oppo PM3 and I would say it is far more neutral/balanced than the Sine, but it's a very dull, lifeless sound imho.
Overall, I will really enjoy the Sines when I want a break from my IEMs. I am also not ashamed to admit, that I look way cooler in public with the Sines on instead of my Laylas.