Although I initially bought the Cayin C9 as the ‘best of the transportable AMP’ options with Korg NuTubes, the solid state implementation of the C9 is actually it’s strength. The NuTubes just take the edge out of the detail, treble and colours the sound. Sure, it’s a more relaxed, warmer presentation but at the expense of detail and clarity.

It was designed to drive IEM’s and open up the soundstage. And to that end it works beautifully with the Oriolus Trailii. Driving the Utopia (Astell and Kern SP2000 -> Cayin C9 -> Class A / SS) with a Danacable Lazuli Reference Plus balanced cable. I’m not left wanting. The C9 shines when paired with top end DAP or headphones. It may not have the dynamics of the Naim Uniti Headphone Edition or a dedicated desktop amplifier but you’ll be splitting hairs to say it’s not summit-fi sound for a transportable solution.

Excellent review again. Thank you.