I ordered the Symphonym - Aoraki MKII Platinum Core Tri-Hybrid Headphone/IEM Cable and realized that I mistakenly chose MMCX instead of IE300/600/900 connectors. A quick message back and forth with support fixed this and my cable was assembled, shipped and arrived quickly.
I was impressed immediately by the packaging and care that Null Audio took in shipping this item.
The cable has had about 15 hours of break-in time, and I am using a generic Motorola Android phone and a Questyle M15 DAC dongle for much of my listening.
My impression so far is that the Symphonym - Aoraki MKII Platinum Core Tri-Hybrid Cable is a significant upgrade from the stock Pentaconn 4.4mm cable supplied by Sennheiser for the IE900 IEMs. This new cable opens up the highs and brings air, sparkle and shimmer around transients, a sense of depth and heighth to the soundstage--which has widened and now places some instruments and vocals outside my head. The bass, which was not an issue before, is now just as deep and tight but with a dramatic increase in pace and speed. Spending over a thousand US dollars for this cable should make anyone pause. But I am very happy with my purchase as well as Null Audio's excellent support. Ultimately, what matters is the music. My new Symponym Aoraki Mk II has made my music sound more alive, purposeful and less veiled. Imaging, musicality and tempo are all much more resolved and enjoyable. I highly recommend the Symphonym - Aoraki MKII Platinum Core Tri-Hybrid Headphone/IEM Cable to anyone whose music needs a more revealing presentation.