FATfreq Grand Maestro | Universal Tribrid IEMs

Experience Ultimate Sonic Power with the FATfreq Grand Maestro 13-Driver Tribrid IEM

13-Driver Tribrid: (X1) Dynamic, (x8) BA, (x4) EST
Vocal switches enable adjustment of vocal presence to preference
Noah modules allow for low frequency tweaking: greater physical bass slam or stronger low-end control
Precisely tuned pressure valves deliver impact without fatigue
Available in (x4) packages: Standard, Deluxe, w/ upgrade cable, or w/ Noah modules
Check out our measurement of Grand Maestro


FATfreq's 2023 Flagship IEM
Grand Maestro is the ultimate end-game monitor for anyone looking to take their music experience to the highest level. It features award-winning frequency response with exceptional bass feedback, interchangeable NOAH modules for customizable bass response, precision tuned pressure valves for minimization of ear fatigue without sound compromise, and built-in vocal boost switch for a total of four (requires purchase of Blue Control Modules) expertly-tuned frequency curves.
Latest revision includes:

Recessed 2-pin sockets
Recessed Vocal Switches
Luxury Collector's Exhibition Box
Metal NOAH Modules

Four Packages Available


Standard Package includes Grand Maestro, Case, Black Noah Module, and standard Silver cable

Deluxe Package includes Grand Maestro, Case, Black Noah Module, additional Blue Noah Module, and Gold Upgrade Cable

Standard + Gold Cable only

Standard + Blue Blue Noah Module only

FATfreq Bass Chamber + NOAH Modules
Meticulously engineered, the bass chamber utilizes cutting-edge acoustics to amplify low-frequency vibrations, setting the benchmark for deep, captivating Bass response. Detachable Bass Chamber Modules allow you to customize your Subwoofer Slam while retaining the breathability of FATfreq's custom-built Dynamic driver:


Black 'Power' Modules concentrate Sub-bass power for more Slam

Blue 'Control' Modules control the Sub-bass response for more Rumble


Vox Boost Switch
Enhance the clarity of vocals in your audio content with a flick of a switch. Whether you're listening to music, podcasts, or watching videos, you'll hear every note and word with remarkable precision.
Precision Tuned Quad-EST Drivers
The Grand Maestro is powered by Quad precision-tuned Electrostatic drivers for unmatched detail retrieval and soundstage up to 40kHz and beyond.
Upgrade the Cable for the Ultimate Experience
Upgrade your set with FATfreq's custom-made Gold-plated pure Silver cable to enhance the musicality and headroom of your mixes. Package includes interchangeable 2.5mm, 3.5mm, and 4.4mm terminations for your choice of source.

FATfreq Tech
BASS CANNON™ (Patent Pending): Using proprietary dynamic woofers, bass chambers and acoustic filter networks, FATfreq was able to design the deepest bass ever recorded of over 20dB, concentrated below 200Hz with zero bleed. Not for the faint of heart.
NOAH MODULES: Customizable bass chamber technology that revolutionizes in-ear monitoring. Switch out your modules for personalized bass tonality and tuning while benefiting from the pressure relief valves which prevent ear pressure build-up. Experience personalized sound and ultimate comfort with Noah Modules. Built with BASS CANNON™.
LINEAR IMPEDANCE: FATfreq uses proprietary circuits to correct the non-linear impedances of multi-driver systems. The different output impedances across all your devices cause frequency response to vary. Having this tech ensures consistency in frequency response for the entire FATfreq IEM lineup.