Hidizs MK12

Exceptionally well-built with a confident tuning that demands your attention

Every now and then an IEM comes along that feels engineered with real intent. The Hidizs MK12 is one of those sets. It combines excellent build quality with a confident, balanced tuning that simply works across genres. Nothing shouty, nothing hyped—just an easy, refined listen supported by a premium-feeling metal shell and reliable 2‑pin connectors.

Overall, I think this IEM has something special, while the tuning won’t be for everyone, it has a confident sound especially with the Red filter installed, that I highly recommend people try out. The other filters also provide something interesting and unique but might have a little too much treble sharpness for some people.

But first let’s have a look at what you get in the box:

Unboxing and Build Quality

Everything in the box is fantastic for the price. You get a generous set of eartips, useful nozzle filters, and a solid cable—everything you need to get a comfortable fit and the sound you prefer.

The MK12 are proudly presented when you open the box:

Lots of specifications on the back:

The MK12’s first impression is all about materials and machining. The shells are incredible solid with an almost ‘Alien’ look and feel to them, precisely finished, pocket‑friendly in size but with a lovely weight that adds to the sense of quality in this build.

Accessories

Included accessories are excellent, I love the amount and variety of eartips:

The detachable High-Purity OFC Silver-plated Cable is designed around practicality and longevity. 2‑pin connectivity gives you options for balanced terminations or mic cables later on.

A closer look at the shells and machining detail, I do think they look like they came from an Alien movie or maybe from the Klingons in Star Trek:

Fit and Comfort

The MK12’s ergonomic shells sit naturally in the ear with a shallow‑to‑medium insertion.

Basically these will be comfortable in most peoples ears whether you have smaller or larger ear canals:

Note: It comes with the Gold nozzles installed.

The weight distribution is excellent for a metal design.

As I mentioned earlier, the eartip selection is exceptional, here are some more photos of the different extra eartips offered:

Tip styles include bass, balanced, and vocal options, making it easy to tailor seal and feel:

Each eartip has its own unique shape and sonic characteristics:

Tuning Filters

The MK12 includes swappable nozzle filters that change the final tuning slightly. After trying them all, my clear preference was the Red filter:

Features

Hidizs MK12 Turris do feel like premium IEMs. They feature, according to Hidizs, the world’s first 12mm large 91% pure magnesium diaphragm dynamic driver unit.

Here are the key driver features:

• High-Performance Single Dynamic Driver IEMs.
• 12mm Large-Sized Dynamic Driver Unit.
• Large 91% Pure Magnesium M-Shaped Dome Diaphragm.
• CNC-Machined Integrated Metal-Cavity Design.

Sound Impressions

I have been listening to the MK12 for a number of weeks now. While reviewing the Hidizs AP80 Pro Max it became my daily driver and I have had it in my bag
ever since. So, below are my notes from this experience:

Bass

• Quantity: A gentle bass shelf that adds body without boom
• Extension: Sub‑bass is present and linear enough to underpin modern tracks
• Texture: Clean leading edges; kick and bass guitar remain distinct

Midrange

• Vocals: Natural presence without shout; male and female vocals are equally convincing
• Timbre: Instruments like piano and acoustic guitar sound true‑to‑life
• Balance: Lower mids are filled in without mud, preserving clarity

Treble

• Extension: Smooth and controlled; avoids harsh edges
• Detail: Retrieves fine detail without drawing undue attention to itself
• Fatigue: Low fatigue even at higher volumes

Soundstage & Imaging

• Stage: Moderately wide with a coherent center image
• Imaging: Stable positioning and good separation in busy mixes
• Layering: Solid depth for the price, with clean delineation

Specifications and Measurements

Technical Specifications

Obviously, with a sensitivty of 111 db/mW they are easy to drive and I have been using them with various portable dongles as well as my Macbook Pro without problems.

Measurements

Lets start with the Frequency response using the default filter (Gold one):

This has some midrange warmth but the upper midrange / presense region might be a little forward for some people, this means vocals will be a little louder / forward in the mix:

Next, comparing the nozzles (correctly named and coloured in this image):

The red nozzle has slightly more bass (1) but crucially has a more relaxed treble (2), giving an overall nicely balanced sound. Though it still has that slightly warmer mid-bass that can be very pleasant.

I thought it was interesting that the Fosi Audio IM4 (review coming very soon) has a similar ‘default’ tuning:

While the Fosi Audio IM4 is cheaper, it does not have a similar filter to the Red option offered by the MK12 and its eartip selection is not quiet as good, but it is still a decent IEM.

Distortion is kept to an absolute minimum even when playing over a 100db:

Rating Explanation

I feel the MK12 deserves a Pragmatic Rating of 5 as I feel it nails the fundamentals that matter daily: excellent build, comfortable fit, a balanced tuning that plays well with any library (assuming the Red Filter is used). Who it’s for:

• Listeners who want a durable, metal‑shell IEM with an easy, balanced sound
• Those who value upgradeable cabling and long‑term reliability
• Anyone sensitive to shout or treble glare (Red filter only)

Who should look elsewhere:

• Bassheads who want a big, boosted low‑end
• Treble thrill‑seekers who prefer an extra‑bright presentation, though the Gold filter will give you a nice amount of Treble.
• Those who want a strict Harman or new Meta tuning

Conclusion

The Hidizs MK12 is an easy recommendation in the $150–$200 bracket. It brings an uncommon level of build quality to the price while delivering a confident, unfussy tuning that serves the music first. The included accessories are excellent, and with the Red filter the MK12 lands an a slightly warm, near‑ideal balance that I found consistently enjoyable.

If you want an IEM that just works—comfortably, reliably, and enjoyably—the MK12 belongs on your shortlist.