CrinEar Project Monolith
CrinEar Project Monolith
4.81 / 5.0
(69) 69 total reviews
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Measurements by Hangout.Audio
SINGLE-PIECE MONOLITHIC MARVEL
Project Monolith is CrinEar's limited-edition dual dynamic driver IEM built as a statement of engineering and design. Machined from a single block of brass and finished in 18K Champagne Gold, it introduces CrinEar's MDM (Multi-Dynamic Monolithic) system, where structure, drivers, and acoustics are designed as one unified whole. Limited to just 999 units worldwide, it represents a rare intersection of experimentation and craftsmanship.
At its core is a fully bespoke dual-driver system developed in direct collaboration with the world's leading IEM dynamic driver manufacturer. A 10mm driver anchors the midrange with natural tonality, while a custom 8mm woofer delivers deep, physical bass. Both drivers are engineered specifically for the Monolith's CNC-machined internal geometry, ensuring seamless integration and a cohesive, high-performance sound.
The tuning follows CrinEar's science-first philosophy, more expressive, bass-forward profile. Powerful low-end impact meets controlled, accurate mids, creating a sound that is both engaging and precise. Project Monolith is not just an earphone, it is a preview of the technology shaping the future of CrinEar.
What You Get
- CrinEar Project Monolith IEM (2DD "MDM")
- Detachable 2-pin silver-plated copper cable
- Interchangeable 3.5mm single ended and 4.4 balanced connectors for universal compatibility
- 3 pairs of "standard bore" silicone tips, 3 pairs of "shorter bore" silicone tips, and 4 pairs of shortwide silicone tips in variety of sizes (XS/S/M/L) + 1 pair of M-sized foam tips
- 18K Gold-Plated Aluminium carrying case
Specs
- Driver configuration: 10mm Full-range CrinEar™ DD + 8mm Subwoofer CrinEar™ DD
Multi-Dynamic Monolithic (MDM) Acoustic Structure - Impedance: 14Ω @1kHz
- Sensitivity: 98dB/mW @1kHz
- Frequency Response Range: 2Hz ~ 38,000Hz
- Nozzle Width: 6.0mm (lip)
- Cable Material: Silver-plated Copper

I was hesitant but I am glad it took a few days to sell out since it allowed me to get a built for purpose iem that turned out amazing. I did not get a Diablo. It was interesting to consider and I still do not have a planar item but it felt redundant since I also have a meta and a hype4. Though because of the Meta another limited release experiment was intriguing, but for the cost I was worried about not liking it. Thank fully that delay let me see other reviews that confirmed that the extreme bass did not overpower the rest of the sound. So with the Monolith in hand, I love it. It did take some tip changes but that was a my ear thing, wide bore is best or at least nozzle size like the dunu s&s. I think this could be an easy one and done recommendations for alot of people if it was accessable. Same tuning same technicals at a low price. If that is not in the cards then I am glad to now have 2 limited experiments to enjoy.
I'm truly amazed by the sound that's coming out of this IEM, the clarity is above what I expected from DD IEM. The bass is enjoyable especially when i was playing games, just like i'm back at the desktop pc with the subwoofer cranked up for the sheer joy of immersive experience.
The size is just right for my ears, it would be even better had there been more choice of ss size eartips.
Though i was taken aback by the weight of the IEM in the begining, but after a month use, it doesn't really bother me once its in my ears.
I find the stock cable a little thick, i tried to swap out with Moondrop thin cable, but immediately find the overall weight a little off balance 😅 Maybe there's a reason for the thickness of the stock cable.
The carry case was a little heavy to carry around, would have prefer a compact round leather carrying case. But the champagne gold design is really good, quite an aesthetic piece that I enjoy to watch on my desk.
Overall I'm pleased with the purchase and am enjoying music with it as I type out this review, so thumbs up!
These iems are very bass heavy and I love them for it. For me, the mids are covered up by the bass but not as much as I expected. I bought these not for my everyday listening, but for occasions when I'm really in mood for some edm music and getting riled up or blowing off some steam.
I love the included cable. It's firm but very flexible. The carrying case is very satisfying to open and close. #383
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After breaking them in for 30 hours, I compared them to my favorite dynamic driver IEM’s, the Sennheiser I.E.600’s. Using the A &ultra SE300 in NOS/Class A mode,the Mono’s have a good soundstage. But the highs are rolled off too much and that also leads to slightly muddy bass on drum hits.The vocals are also slightly recessed compared to the 600’s.
I see the MDM concept as similar to the Sennheiser 3-D printed shell for the 600s, without the cost and exotic metal used. I’m sure the next CRINear release will have an improvement of the design.
As it stands now, the Daybreak’s are the best sounding Crin IEM’s per dollar that he sells right now.