ThieAudio Monarch MK4 VS Fiio FX17

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Priced between $1,150 and $1,300 depending on custom faceplate options like the butterfly design shown, the Thieaudio Monarch MK IV boasts exceptional build quality with a large but well-contoured titanium shell offering a secure and comfortable fit. Key features include the innovative rumble switch for adjustable bass levels on the fly, a durable two-pin connector, and a solid feel that inspires confidence in longevity. While the included accessories are considered fair but unexciting, the shell's customization potential and rugged construction are major highlights.

Sonically, the Monarch MK IV delivers a detailed, exciting, and clean sound signature that stands as the best in the Monarch lineage. The rumble switch provides two distinct profiles: the red switch (no rumble) offers a balanced, tactful bass presentation, while the gold switch (rumble) adds a satisfying sub-bass shelf ideal for genres like hip-hop. Treble performance is notably improved over the MK III, though a 10k peak requires careful ear tip selection for some listeners. It trades blows with flagships like the $3,000 Annihilator (better sub-bass focus) and the $1,800 Elysian Apostle (more vocal forward), often matching or exceeding their technicalities while offering its unique tuning flexibility.

Scoring a top-tier 9.8, the Monarch MK IV earns its place through a compelling combination of premium build, the highly functional rumble switch, and outstanding sound quality that feels both special and refined. While acknowledging the high price, it represents significant value against competitors like the $2,000 Thieaudio Valhalla or the fiddly Grand Maestro, offering a feature-rich, durable, and sonically excellent package that justifies its position as a current summit-fi favorite.

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Fiio FX17 packs a wild driver stack—8x EST plus 1x dynamic and 4x BA—and a price that hovers around $1,500–$1,700. The shells are large and a little heavy, yet comfortable with solid isolation; the matte-steel finish looks slick but is a fingerprint magnet. MMCX sockets sit in a blue-ringed collar, and the included cable is genuinely nice: chin-slider equipped with swappable 4.4 / 3.5 / USB-C ends. Packaging is classic Fiio with a generous spread of ear tips (including SpinFits). Overall fit and finish scream audio-jewelry, in both the good and the pricey senses.

Sonically, this is a very wide, “open” presentation with impactful bass and noticeable warmth—sometimes veering toward mud rather than cleanliness. Upper-mids energy is restrained, while the 8 kHz region pops, and treble air extends well; the net effect leans neutral / deadpan-neutral with a slightly warm tilt and not a ton of bass heft. The tonality mirrors Truthear Pure more than many top-end sets, which will delight listeners who crave that profile but leaves others wanting more sub-bass punch and less incisive 8k. Technicals—detail, slam, and stage—are strong, yet the value is debatable when alternatives like Fiio FA19 / FX19 (more bass, less 8k bite), Dunu Glacier (more sub-bass and fun without losing correctness), Softears RSV / RSV MK2 (similar upper-mids with calmer 8k), Aful Dawn X (less warmth, better air for the price), or NiceHCK Rockies (cleaner treble) exist for less. Recommended for those chasing Fiio’s neutral house with a grand soundstage; everyone else may want EQ (a gentle clean-up of warmth/8k) or to shop the cheaper powerhouses.