@drmuso and @baylinor … I personally find the BL-1 (aka the Silversonic cable) to be quite revealing but lean and can be seen as bright if your equipment is already transparent. I’m surprised you couldn’t tell a difference with the BL-1 iCable compared to other Y-cables. I was able to hear the difference immediately, but overall I moved on from BL-1. @drmuso perhaps you should try comparing the BL-1 iCable again now that it’s broken in.
The BL-1 is an excellent cable for those that feel their systems are not closed in. Perfect for mid-fi in particular since it will balance out overly warm and forgiving systems like Marantz/Wharfedale combos.
The Air Matrix is a significant step up from the BL-1 in terms of bass and midrange body. I don’t find it to be nearly as fatiguing, and it is quite balanced. Regarding Y-cables, I ended up having the DH Labs team build me a custom one out of the Air Matrix cable and it is very, very good for a Y-cable. I’m not using it anymore, though I still have it in a drawer should I ever need a Y-cable again.