General Information

Intro​


  • 6mm Low-voltage Magneto-static BM Driver
  • 10.2mm dynamic driver for overall Enhancement In The Mid-bass Range
  • 3 Tuning Valves for 3 Different Audio Experiences
  • Mix braided quad-core high purity silver & OFC wires
  • Eco-friendly Resin Body & Lozenge-cut Faceplate

6mm Low-voltage Magneto-static BM Driver


MM2 adopts a 6mm magneto-static BM (Balanced Membrane) driver customized by HIDIZS and Korea BSE, with an extremely thin and light micron-level diaphragm, which shines in transient responses to high frequencies - fast, crisp, smooth, detailed, and retains excellent layering.
Easily drive ultra-high frequencies with no need to increase voltage, low distortion, with seriously excellent resolution and extensibility.

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Overall Enhancement In The Mid-bass Range​


Hidizs PEK macromolecule polymer diaphragm+ 10.2mm dynamic driver handles bass and mids. The bass digs deeper with excellent speed, a tight response, and is punchier. The mids are smooth, detailed, and have a more U-shaped character. Vocals are sweet and instruments sound natural.
Large soundstage, outstanding imaging capabilities, excellent layering throughout, with great presence - MM2, a pair of IEMs you’ll never regret having.

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3 Tuning Valves for 3 Different Audio Experiences​


Get one tuning style only from a pair of earphones?
NOT the Hidizs MM2. You get 1+3 audio experiences here. Coming with three detachable tuning valves for Balanced, Treble, and Bass. The earphone body is specially designed with an audio hole. By changing the valves, different sound styles can be converted, bringing you more incredible sound performances, which greatly enriches the playability of MM2.

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Eco-friendly Resin Body & Lozenge-cut Faceplate​


Eco-friendly resin with custom style for longer, more comfortable wear. The faceplate is cut in a lozenge shape, demonstrating the charm of three-dimensional geometry. MM2 IEMs look like an exquisite black diamond, with a detachable audio hole on the middle, for an elegant and chic look.

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Beautiful Sound will Find Its Way​


High-quality cables are the essential part of professional HiFi earphones. Hidizs MM2 comes with high-purity oxygen-free copper (OFC) and high-purity silver wire, twisted from 60 strands, respectively. Silver wires for a crisp and clean sound. Copper wires for soft and smooth audio performance. Both contribute to the improvement of your listening experience.

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Standard 0.78mm 2-pin Design​


In addition to the different sound styles brought by the 3 detachable tuning valves, MM2 retains a standard 0.78mm 2pin design to allow for the use of cables with the same specifications, either to further upgrade the sound or experience more listening experiences created by different cables. The cable sockets were upgraded to gold-plated materials to ensure more stable audio signals transmission.

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Comes With A Stylish Custom Leather Carrying Case​


Designed for Hidizs MM2 HiFi in-ear monitors only. Eco-friendly and stain-resistant Napa leather case comes with full drop protection coverage. 6 zinc alloy double buckles are used for support. This clamshell protective case is perfectly sized to accommodate your Hidizs MM2.

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Hi-Res certification​


Hi-Res Audio(HRA), is a standard for high-quality audio products formulated by JAS and CEA, currently recognized and supported by premium devices, as well as audio connoisseurs far and wide.

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Latest reviews

Coralian

New Head-Fier
Hidizs mm2 mermaid Properly tuned proper magnetostatic hybrid
Pros: Boosted but well-controlled bass
recessed yet natural mids
detailed, sibilance free treble
Cons: although the treble is boosted it doesn't highlight the full spectrum of the treble region. a more smooth and even treble would have been better.
When a manufacturer uses a different driver type in their products this usually turns some heads. I mean when a product segment has a relatively steady phase any difference in a product tends to peak the interest of people.

This is something that many manufacturers knows and takes some advantage of. We’ve seen many brands take an innovative approach to the IEM’s with different drivers like planar magnetic drivers, electret or magnetostatic drivers Est's you name it.

When things come to magnetostatic drivers Shuoer started the trend with their Tape and singer back in 2020 and kz followed the trend.

A magnetostatic driver is a relatively exotic driver. It's basically a dynamic driver but cannot produce low frequencies. It's detail retrieval capabilities makes it a good choice for any IEM that is under 120 or so bucks. It's definitely a better option than any BA driver that most of the budget options like kz uses. Higher end options like Knowles has a similar level of detail but sometimes lack the natural timbre that they have.

Well using this depends on how good you can tune them. In this case, shuoer and kz kinda failed. According to other reviews, tape was too shouty, singer was too sharp (haven’t tried it) and kz failed big time; both ZEX and NRA had great detail capabilities especially with the strings and vocals but damn they were bloated as hell, well not too much but it killed the details.

Why am I mentioning these? Well because I want to emphasize on how important it is to a manufacturer to understand the components that they are using.

Hidizs mm mermaid is a good example for this case. Why? It’s hybrid model that uses a magnetostatic driver. And it's tuned to be bassy. It has a lot of bass. But it's extremely well controlled.

It's V shaped. So it's a given to lose some details in the mids. This would be the case with any dynamic driver based model but thanks to magnetostatic driver in this model there’s not much of lose of detail in the mids. Yes they DO sound distant that's the case with V shaped tuning. But in the end, it retains the little nuances in the mids.

Bass is noticeable. Like I said it has a lot of it. It kinda rolls of below 50 hz. This does affect the Soundstage; it focuses everything in front of your head instead of a 360-degree bubble effect. It’s not bloated but this amount of bass will eventually mask some of the little details in the treble region.

Treble is another area where gets some extra attention. It is elevated but it doesn’t shows any sibilance or sharpness. I especially enjoyed the high hats and percussions. They definitely sound great with the mm2. But it suffers the adverse effects of boosted bass; although its fun it doesn't highlight all of the details in this area.

Also, mm2 has some filters for tuning options. They control the amount of air the dynamic driver gets. It increases or decreases the amount of bass. Don’t expect any changes in the mids with them. Depending on the filter you either get extra bass or treble. I don’t think that they are gimmicks but I so think that it's not a mandatory thing to have. I personally don’t think you need them because in the end you get the same flavor with minor changes. If there was a way to change the tuning between a warm-neutral and this V shaped tuning that would have been a better idea. I think a switch would be a better option for this purpose.
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Accessories and presentation wise this is a very good product. Although I think KBEAR and BGVP has better eartips mm2 doesn’t lack that much. It is a good option for anyone who wants a v shaped IEM that has good quality mids. And also people who might want to try a magnetostatic hybrid would definitely be happy with this IEM. It's the best option right now. I would be happier if there was a more balanced alternative for this driver combination. This setup has good potential but it cannot bring its full potential with this engaging fun tuning. As a product, Moondrop Aria holds the top spot for the warm to neutral segment. Having a magnetostatic driver alternative in this segment might be a good idea. After trying a neutral-bright IEM like TKZK wave I realized that there's not many options for bright-neutral alternatives either. offering extra alternatives in these segments could be a good move depending on the tuning and detail retrieval. MM2 does have the necessary detail potential so its up to the Hidizs.
let's wait and see what the future holds.

kmmbd

500+ Head-Fier
Yet Another Budget Contender
Pros: Excellent stock cable
– Comfortable
– Very good staging for the price
– Good separation
– Engaging bass response
– Tuning filters allow different levels of bass/treble.
Cons: Rose-gold accents on the Hidizs MM2 cable might be a turn off
– Lower-midrange recession
– Upper-midrange sounds strained on treble and neutral filters
– Steep treble roll-off post 7kHz.
– Needs to be priced lower to be competitive
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Hidizs’s latest IEM release are the MM2 and they feature a hybrid setup with 10.2mm dynamic driver for bass and mids + 6mm magnetostatic driver for the treble. This combo is often seen on more budget-tier IEMs so Hidizs need to differentiate their product somehow. Turns out, they opted for a tuning system based on removable screws on the back of the IEMs.

Let’s see if the tuning system alone is enough to make the Hidizs Mermaid MM2 an worthy contender in the <USD $100 IEMs space.

This review was originally published on Audioreviews.
Note: the ratings given will be subjective to the price tier. Hidizs sent the MM2 for evaluation.
Sources used: Lotoo PAW 6000, Sony NW-A55
Price, while reviewed: $80. Can be bought from Hidizs’ Official Website.

ACCESSORIES

Both the stock cable and the carrying case deserve a mention here, since they are some of the best you can find in the packaging of IEMs under USD $100. The stock cable is supple, doesn’t tangle easily, and looks great.

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The carrying case is somewhat over-engineered yet maintains a muted outlook. Rather unexpected for a pair of budget IEMs.

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BUILD QUALITY, FIT, COMFORT

Build is very good with the metal faceplate seamlessly blending with the resin shell.

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The filter mechanism works by adjusting the size of the back-vent, which in turns control bass quantity. There are three different filters with varying degree of bass, though I preferred the Reference filter the most.

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I should note that I prefer the rear-mounted filter system as opposed to nozzle or tip mounted ones since they are more cumbersome to swap. Also it’s need stating that the passive noise isolation is below average, as the rear-vents allow noise inside. No driver-flex was noticed which is a plus.

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TONALITY AND TECHNICALITIES

The general sound signature of the MM2 can be described as variations of “V-shaped” tuning with varying degrees of bass and lower-treble depending upon the choice of rear-filter.

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I think the bass response is the star of the show here with punchy mid-bass and good amount of rumble in the sub-bass region. The slam is also above-average so these drivers are moving good amount of air.

The issue arises in the lower-mids region where, with the stock and bass filter mids sound too recessed, resulting in distant male vocals, snare hits etc. The aggressive pinna gain around 2.5kHz compounds this further with high-pitched or soaring vocals sounding strained, as can be heard on Alexisonfire’s This Could Be Anywhere in the World. The male vocals do gain a bit of thickness with the bass filter but then again the large amount of mid-bass drowns out the subtle articulations of voice, resulting in a lack of resolution.

Treble peaks around 4kHz and then goes for a steep decline from 7kHz onward. This robs off the airiness of cymbals and hi-hats, resulting in a muted presentation devoid of shimmer and resonances. The magnetostatic driver is supposedly aiding the treble response and whereas some magnetostatic timbre can be heard, the sheer extension is lacking. Treble overall is not bad, it is just unremarkable.

What is remarkable though is the staging performance of the Hidizs MM2. Stage is wide, with instruments often being placed outside your ears in binaural tracks, e.g. Amber Rubarth’s Strive. Stage depth also seems above-average though that is mostly attributable to the lower-mids recession. Imaging was above-average though lacked the precision of some of their peers. Instrument separation is above average but is often let down by the overshadowing bass.

I wouldn’t call the timbre plasticky myself but it definitely lacks some of the richness one would expect from a natural-sounding setup.

SELECT COMPARISONS

vs Dunu Titan S

Dunu’s budget model of the refreshed Titan series have 11mm dynamic drivers with LCP diaphragm. Dunu went for a more neutral-bright tuning with the Titan S and the driver is also faster than the MM2 during transients. Due to the upper-mid and treble focus, the bass on the Titan S doesn’t have as much authority as the MM2 bass.

One area where the Titan S surpasses the MM2 is sheer resolution, with the Titan S being more revealing of mastering flaws and also having better imaging. Staging is not as wide and tall as the MM2, however, neither is the macrodynamic punch as evident.

Given the similar price, the Titan S offer great value for those who are after a neutral-ish pair of IEMs. The Hidizs MM2 will cater more to those who prefer a mainstream or V-shaped tuning.

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CONCLUSION

The IEM market is the most ruthless in the under USD $100 segment as new models pop up almost daily. Hidizs MM2 stand out with great accessories and a filter-system that is quite unique, while offering various levels of bass.

Unfortunately, the mids and treble frequencies are somewhat off in terms of tuning and that mars the experience. The treble roll-off hurts the sense of resolution the most, something one would expect from IEMs at this range.

I do think the Hidizs MM2 would offer better value had they been priced somewhat lower. The accessories are quality however, so maybe you are paying the extra for those goodies.

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Otto Motor

Headphoneus Supremus
Hidizs MM2 Review
Pros: Great staging, resolution, and separation in its class; tuning options with screw-on filters; great cable.
Cons: Timbre not the most organic; large shells; rose gold not for everyone.
Since the previous reviewers have already covered the Physicals, I am focusing on sound.

You find the whole story at https://www.audioreviews.org/hidizs-mm2-review-jk/

Equipment used: MacBook Air | Earstudio HUD 100 (low gain) with AudioQuest JitterBug FMJ | stock bass filters | stock wide-bores.

Since Hidizs give you the option to perform your own tuning with the included screw-in filters, I started tinkering with them…and finally decided on the bass vents as the created the “most substantial” sound experience for me with a great vocals reproduction.

In the big picture, the Hidizs MM2 is all in one: a neutral sounding iem (normal filters), a warm one (bass filters), and a screamer (treble filters ).


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Green is my colour. Nor piercing upper midrange, no shoutiness.

In my favourite “bass” configuration, the MM2 deliver a “fun” signature with some surprisingly good sonic characteristics.

Bassy filters means serious bass, without being too serious. Focus is on sub-bass. It digs deep, very deep – and with some energy. Mid bass slam has still good impact. This makes the low end a bit blunt and less tight than I want in some tracks. I don’t think the bass is overdone, though. All in good doses. It’s fun tuning after all.

The transition to the midrange works rather well. I would not call it bleed but the bass re-inforces the vocals in the lower midrange department quite efficiently. Although recessed, female and male voices are not lean or thin but have some nice richness and creaminess. They are not your stale black coffee but more a mocha latte with 2% milk. Notes are surprisingly well rounded. The MM2 beats a notorious weakness of budget iems in this department. And, although there is enough energy in the vocals, there is no shoutiness.

Treble is well resolving. Cymbals are very crisp, clear, and well carved out, but also a bit robotic, which is an artifact of this kind of driver. And since the treble sits a bit back, the cymbals are frequently covered up to some extent. I take it the magneto-static drivers are connected and working (as opposed to some of the competition’s).

Stage is no the widest but has good height and decent depth (with the bassy filters). Resolution, separation, and layering are astonishingly good. But…the timbre…is somewhat plasticky and could be more organic. Once I got used to it is as fine. That’s the biggest concern I have about this earphone – and I’d take $20 off for that.

Concluding Remarks

So why not tune yourself? By screwing in tuning filters you also screw the noisy YouTubers…that bad pun may be allowed. Hidizs have done a decent job with the MM2 and the tuning filters, which can be helpful particularly for newbies who want to learn different sonic signatures. Nevertheless, the MM2 could be $20 cheaper imo. But, maybe Hidizs let you tune your own price, too…see included coupons.

Until next time…keep on listening!

Jürgen Kraus signature


Disclaimer

The Hidizs MME was provided unsolicited by Hidizs and I thank them for that.

Get the MME from Hidizs.net
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