Today, we’re diving into a debut offering from a new brand—the brand new ooopusX Op.24. This isn’t just another set of IEMs. It’s a hybrid powerhouse with a 2DD+4BA driver setup and a physical tuning dial that promises to let you customise your sound. So, let’s see if this entry-level IEM lives up to the hype. The Op.24 is priced at $49 USD.

Disclaimer: This sample was provided by Shenzhen Audio for an honest review. All observations and opinions here are my own, based on my experience with the product.

ooopusX Op.24

Specifications

Driver: 2 Dynamic Drivers + 4 Balanced Armatures
Diaphragm: Silicone Composite Carbon Fiber Dome
Impedance(@1khz): 15Q(Mode 1), 27Ω(Mode 2)
Sensitivity(@1khz): 127dB/Vrms
THD(@1khz): <1%
Frequency Response: 10~40kHz
Cable Material: Oxygen-free silver-plated cable

Inside the Box

• OP24 * 1
• Earphone cable * 1
• Eartips * 6 pairs
• User manual * 1

Design

The OP.24 features a hybrid driver setup: two dynamic drivers for the bass and four balanced armatures for the mids and highs. This combination is almost unheard of at this price point. But the standout feature is definitely this physical tuning dial. It lets you cycle between the 2 sound modes, without the need for any tools or fiddly nozzle switching. I’ll cover the difference in the sound modes later in the review.

One of the first things you’ll notice about the OP.24 is its physical design. The styling is definitely futuristic cyberpunk or mecha-inspired, with white shells and black, grey, and orange accents. I think they look really cool and stand out from the crowd, although I can see the styling being a bit divisive.

As for build quality, the shells are plastic but they feel well-made and solid. In terms of comfort, I found the OP.24 to be very comfortable, thanks to its ergonomic shape. However, I did find that I had to experiment with several different types of eartips to get a secure and stable fit. I ended up replacing the stock cable with a third-party option, since the rigid earhooks were too aggressive and interfered with the fit.

Sound

Sources used for testing include the FiiO KA17, HiBy R6 III 2025, and SMSL RAW-MDA1. Given its sensitivity and low impedance, the ooopusX OP.24 is easy to drive. You won’t need a high-powered amp to get the most out of them. A simple dongle DAC or even your phone’s headphone jack will do the trick.

I’d describe the overall sound signature as a light V-shape. It’s a very competent and cohesive sound, especially for a budget hybrid with this many drivers. It doesn’t really stand out in any single area as being a ‘game changer,’ but it performs nicely and consistently across the board.

The sub-bass is definitely boosted a little. You get a satisfying rumble on tracks that call for it, but it doesn’t ever become overbearing or messy. This isn’t a basshead IEM, but for most listeners who love a bit of a low-end presence, the quantity will be more than enough. The mid-bass is punchy, with good control and minimal bleed into the midrange, which keeps the sound from getting muddy.

Moving up to the mids, they’re slightly on the warmer side of neutral. Vocals—both male and female—come through with a rich, silky quality. The presentation feels articulate without sounding like it’s trying too hard to create a sense of ‘forced clarity.’ It’s a very natural and pleasant listen that avoids harshness.

And finally, the highs. This is where the OP.24 really surprised me. It has above-average detail retrieval for its price point. You can pick out micro-details in the music that you might miss on other budget IEMs. However, it manages to achieve this without being sibilant or fatiguing. This is a crucial point—you get all that extra detail without any of the sharp, irritating treble peaks that often come with it. It’s a very well-controlled top end.

Comparisons

Kefine Klean

The Kefine Klean comes across as a little more mature and refined in its tuning, although the Op.24 comes quite close in both tuning and technical performance. The Klean has a more spacious midrange and smoother treble, as well as a wider soundstage. Ultimately, they’re both strong performers, so if you prefer the look of Op.24, you won’t be sacrificing much in terms of audio quality.

Verdict

In conclusion, the ooopusX OP.24 is an interesting debut from this new brand. It’s not a flashy performer, but it’s a consistently decent one. The sound is cohesive, the vocals are silky, and the detail retrieval is a pleasant surprise for an IEM with a warm sound signature. It may not outclass its rivals in pure audio quality, but if the mecha-inspired design appeals to you, it’s a solid pick.