Playing the part where she listened to the recording again and again in a slower pace, I can figure out the words ‘anata dake ni kikoeru,’ more or less.
This roughly translates to ‘And to only you I will listen.’ This ties in with the assumption that the contractor who can see the future is Amber. I assume it was her saying this, and she was saying this to Hei.
Of course, this is all guesswork. But try playing the scene again. The words are relatively distinct.
When Darker than Black was announced, I was among those who jumped into the bandwagon. I just knew it was going to be a good show even if I didn’t know what it was about yet. When it aired, I was awed and amazed by the smoothness of the protagonist, and I vowed to finish watching it. Circumstances, however, prevented me from doing so: at the time, my laptop was technologically antediluvian, and I wasn’t able to properly view the releases by [sudo], which were, sadly, only in high quality.
I waited for a while and tried a second time to watch the show. I was able to reach a little further (I was able to watch fifteen episodes this time, but to my dismay I had a lack of disk space and I couldn’t delete anything). Yet again I had to postpone my enjoyment of it. Finally, a few months ago my aunt bought me a laptop that remains to be cutting edge. It possesses a decent processor, and it has a lot of RAM and HD space: finally, it was something enough for me to be able to watch and enjoy anime properly. Having recollected about Darker than Black I sought to watch it, and I finished doing so the previous week. I thought the ending was great, and while there were some middling moments in the series, the action was finely crafted and I was sympathetic to the protagonist Hei. The ending was quite bittersweet and made me recall the ending of Evangelion (as they were very similar): Hei was given a choice to either be with his loved ones (contractors) but sacrifice a significant part of humanity in the process, or to choose both humans and contractors but to lose the only things in his life that he ever valued, namely Pai, Amber, and the real stars he had always wanted to see. He chose the latter, and while it was a painful choice (not only emotionally scarring, but also physically enervating, as he now has to run from both contractors and humans), it was a most noble choice.
I was thus both happy and wary of the current season airing: I had already read the manga (which serves as the bridge between the first and the second season), and a most remarkable loss was that of Yin. She was no longer in the second season, and Hei was far from the Chinese Electric Dark Knight he was in the first season: on the contrary, his physical qualities reflected a broken man. I did not want to watch the show because I did not want to entertain the possibility of Yin having died, but my curiosity and affection for Hei got the better of me. So I watched.
A lot of new characters were introduced and the most notable among them (perhaps because she is the heroine of the second season) is Suou. Contrary to the kind and meek Li and the highly efficient (and clean-cut) Hei of the first season was a desperate, alcoholic, and nomadic Hei. His demeanor was also as rough as his looks, and I could only assume that it was because there was also none of Yin to be seen: he has slapped and beaten Suou up, although I would argue that these were merited. He never hit her just because he wanted to: there was always reason behind his violence, just like the first season.
I was glad that Mao eventually resurfaced. I was even more glad when Yin was finally confirmed to be alive, and that she had transcended even her past self. From what could be seen in the sixth episode, she exhibits contractor-like powers in addition to the seemingly unlimited range of her observer spirit. It was also clearly evident that Suou has developed feelings a lot more than mere hatred for Hei: I would even argue that it was a jealousy not quite yet because of love, but nearing there. A lot was revealed in the sixth episoode: I just wish that, at the end of it all, Hei will get his happy ending with Yin, because I firmly believe he deserves it.