NikKTech posted a review on the Periodic Audio C (Carbon) In Ear Monitors
A quote from the article:
The C (Carbon) IEMs by Periodic Audio are their best audiophile-grade IEMs to date and I've been using them with the FiiO M11 high-res music player and my lossless FLAC collection for almost three weeks now.Periodic Audio C (Carbon) In Ear Monitors Review