Flagship-level detail meets bone-rattling bass—custom-tuned at your fingertips.
Reserve Your THIEAUDIO Monarch MKIV NowCustomizable Dual Tuning Modes: Switch effortlessly between studio-neutral and basshead sound with the all-new tuning switch. Choose “STANDARD” for reference-grade clarity or activate “RUMBLE” to boost sub-bass by 3dB for deep, thunderous lows. It's two distinct listening experiences in one high-performance IEM.
IMPACT² Dual Subwoofer System: Powered by twin 8mm dynamic drivers in an isobaric chamber, IMPACT² delivers fast, punchy, and textured sub-bass with exceptional control. Enjoy powerful lows without sacrificing balance or precision, elevating your music with deep, clean impact.
T6 Aircraft Grade Aluminum Construction: The Monarch MKIV elevates its status by utilizing a premium T6 aluminum alloy shell. Precision CNC engineering achieves our most durable, yet lightweight, shell. Surface hardening also ensures more scratch resistance and corrosion resistance against sweat. Experience the fullness of your music with featherlight comfort in your ears.
Refined Treble with EST Drivers: Redesigned electrostatic drivers extend treble response to 40kHz while ensuring a smoother, more natural upper range. Improved crossover tuning delivers seamless transitions and airy soundstage, letting vocals and instruments shine with crystal clarity and realism.



