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This is a buyer’s market for high-end hybrid IEMs right now, and the €900 asking price for the Thieaudio Monarch MKIV in excellent condition is fair, sitting just above the median of €689 from recent EUR comparables but well below the 75th percentile of €899. While it exceeds the 25th percentile of €427, it doesn’t cross into ambitious territory, making it a solid, no-nonsense offer for a flagship-tier model.
The Monarch MKIV is widely regarded as a return of the king in the IEM world, delivering phenomenal versatility with its 10-driver hybrid array (2DD + 6BA + 2EST) that handles everything from delicate acoustic to heavy bass with authority. Its built-in bass switch adds punch without muddying the timbre, and the fit is notably comfortable for long sessions. At €900 in excellent condition, this listing represents a clear buying opportunity for enthusiasts seeking top-tier performance without the €1,011+ new retail price.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Thieaudio emerged from a tight-knit group of DIY audio enthusiasts, evolving into a prominent player in the in-ear monitor (IEM) market without a single founding year or named founder tied to its official origin. Backed by an international team of engineers primarily from China and South Korea, the brand channels a passion for high-fidelity sound that resonates deeply within global audiophile circles.
The company specializes in premium IEMs and headphones, renowned for innovative driver configurations like the quadbrid setup in its flagship Origin model—combining one dynamic driver, four balanced armatures, two electrostatic drivers, and a bone conduction unit for enhanced bass, precise mids, and natural treble. Handcrafted with top-tier materials and custom cables, Thieaudio products prioritize technical excellence and immersive listening over traditional categories such as speakers or amplifiers.
Positioned as a mid-to-high-end niche boutique in the portable audio segment, Thieaudio commands respect for its best-in-class tunings, superb performance, and accessible pricing under $1,000, making it a go-to for discerning bass enthusiasts and critical listeners seeking refined, budget-friendly excellence in a crowded market.
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