Fir Audio Kr5 is the mid level of Fir's newest series called The New Frontiers. It uses a dedicated dynamic driver for the bass and four balanced armature drivers. It packs some great technologies, and it's priced at $2999.
Fir Audio Xenon 6 is the flagship of the new Frontier Series from this American manufacturer. It’s a tribrid construction starting at $3899.
Fir M5 is a flagship IEM by Fir Audio, that's based in Vancouver. It is a trybrid design using 1DD, 3BA and 1EST drivers per side. Here's a review of the custom version with ATOM modules, costing $2948.
Five x Five is the newest release from Fir Audio. It uses a 1DD + 4BA driver configuration, and its design is like nothing else on the market. This little bunny costs $999.