Thor Mjölnir MK2 Review

Today we review the THOR Mjölnir MK2 In-Ear Monitors. It sells for $399 USD.


Disclaimer: Linsoul sent us the Thor Mjölnir MK2 for this review, free of charge. As always, I am here to honestly convey my thoughts about the product to you. 


THOR was founded by a freelance engineer who has built up a sizable reputation in the DIY in-ear monitor community in China. According to the Linsoul website, Thor is driven by a passion for audio rather than financial gain. Also, Every THOR product is individually handcrafted and is available in limited quantity. THOR is committed to handcrafting each and every earpiece in small batches and continually innovating in the field of in-ear monitors.

Unfortunately, I couldn’t find any further information about the creator, or the brand. At least not in English.

THOR Mjölnir MK2

The Mjölnir MK2 is the successor of the original Mjölnir. The original Mjölnir featured a 10.4mm dynamic driver with a beryllium diaphragm. First Mjölnir’s every shell and faceplate was designed bespoke, so each pair was unique. THOR’s newest IEM, the successor of the Mjölnir, the Mjölnir MK2 is utilizing a new dynamic driver technology called “The Fusion Diaphragm”.

The Fusion Diaphragm is a composite of DLC (diamond-like carbon), PEEK (polyetheretherketone), and PU (polyurethane) materials. These membranes have been popular in the industry for their acoustic performance, but by combining them, the Fusion Diaphragm aims to get the best virtues of each material. For us, the 12.56mm special DD sounds intriguing and today we will be checking out its performance, in detail.

Driver Configuration: 12.56mm Fusion Diaphragm Dynamic Driver

Socket: 0.78-2Pin

Housing: Handcrafted Resin Shell & Faceplate

Cable: 1.2m Silver-Plated OCC Cable

Impedance: 16Ω 

Sensitivity: 115dB

Packaging & Accessories

The Mjölnir MK2 comes in a small, black cardboard box. The box looks quite plain and has no artwork or practically, anything, on it. Inside the cardboard box, there is a foam compartment that looks like it is shaped for a carrying case, however, the Mjölnir does not come with one.

The Mjölnir MK2’s packaging includes 3 pairs of tips, an SPC cable, and the IEMs themselves. The SPC OCC cable features a great jacket that has low microphonics and offers great flexibility. While the plugs look very generic, they feel durable and rigid.

Design, Build & Fit

The Mjölnir MK2 features a handcrafted, acrylic resin shell with unique glittery faceplates. The shell of the IEM has a relatively compact structure and its nozzle can be considered long compared to its body. We have reviewed many IEMs with this form and factor recipe and I must say that it works every time. This is the case here also as the Mjölnir MK2 is very comfortable to wear. 

If we look at the Mjölnir MK2 in terms of design, first of all, I must say that I quite like the shiny faceplates and the splash effect. Secondly, the picked materials and the craftsmanship are quite good. Let’s not forget that these IEMs are completely hand-made and made by a single person. Kudos to the creator for his meticulous handiwork. 

The Mjölnir MK2 comes with a similar nozzle compared to what we have seen from ThieAudio before, it is a wide nozzle with a metallic grille. It is not the easiest to clean but it is durable and it is quite easy to do tip-rolling if you like trying aftermarket tips. The included tips are nice though, they provide solid passive isolation and sit tight in my ears without problems. If you want to upgrade, I recommend trying the Mjölnir MK2 with the JVC Spiral Dots. 

You probably did notice the big vent on the faceplates of each earphone. Each Mjölnir MK2 is utilizing a 3d-printed acoustic chamber and according to THOR, the tuning of the earphones relies heavily on this vital part. The vent you see on the faceplate is fitted with a replaceable Knowles dampening filter and can be changed.

Linsoul mentions that it affects the bass response and maybe more, but we, unfortunately, couldn’t test it. The IEMs do not come with a removal tool or any extra dampeners. There is also a pressure/vent hole on the inner side of the IEM.

Overall, I like the design and material quality of the Mjölnir MK2. It is a well-made, well-built in-ear monitor. The faceplate design is unique and looks very nice. I haven’t experienced any fit and comfort issues during my time with it, either.

The review continues on Page Two, after the click HERE or by using the jump below.

Page 2: Sound, Low, Mid, High, Technical Performance, Comparisons, Last Words

4.4/5 - (236 votes)

Long time Tech Enthusiast, an ambitious petrol-head, Yagiz likes his gadgets and always finds new ways into the tinkerer's world. He tries to improve anything and everything he gets his hands onto. Loves an occasional shine on the rocks.

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