MMR Thummim

MMR Thummim


MMR or Metal Magic Research is an extremely new company in the IEM market, however, it is founded by an industry veteran, Joseph Mou who previously founded Jomo Audio and gained a lot of renown with their offerings. 

The Thummim is their flagship universal offering using a tribrid design consisting of a dynamic driver for the lows, 2 balanced armatures for the midrange, 2 balanced armatures for the highs, 2 balanced armatures for the mid-highs and 4 electrostatic drivers for the highs.

Big thank you to Joseph Mou for letting me be a part of EU review tour of the Thummim. 

Build quality and accessories

Starting with the build quality, it’s stellar, the IEMs feel solid without any sharp edges. The parts are very well matched and machined. You definitely feel like you are holding a premium product. The case is well made, albeit a bit large and the IEMs sit in it a bit loosely which can make them move around and bump into one another. Unfortunately, the cable sent with the review unit was an old revision which makes me unable to comment on the final one.

As far as accessories, going off of what people who purchased the Thummim have shown, the package is quite disappointing, a single cable (albeit a 999$ one), few tips, a case and a leather pouch. Feels a bit underwhelming for a product that expensive.

Something which I found extremely interesting and amazing were the 2 pin connectors in the IEMs, they felt the best quality out of any I’ve ever used, the cables would connect almost effortlessly but then the plugs would “click” and the cable would be held securely. 

Fit and comfort

Fit is odd, initially, I attempted to wear Thummim with a deeper fit, but the backside of the angular part of the IEM would dig into my ear and cause almost immediate discomfort. After spending some time finding the right tips, however, with a shallow fit, the comfort improved very significantly, to the point I wore them for 7h at a time and had no issues.


The Thummim is a very well balanced W signature with spectacular technicalities.


The bass is tight, fast and controlled with great extension. It’s also full which shows how well controlled the dynamic driver is. On some tracks, the subbass can shake your skull, it doesn’t feel like something coming from a shell that small and that close to the ear, the presentation is much bigger than that. The midbass never bleeds into the midrange and is very well kept in check to not mask any of the upper frequencies while keeping in the “fun” spectrum. “Trentemøller – Evil Dub” sounded the best out of all the IEMs I’ve heard to date with maybe a tiny bit less sheer resolution than some multi BA setup but with a much better and fuller presentation in return.


The main aspect of the midrange that really pops with the Thummim is how textured the midrange is, everything just feels alive and present while never being shouty or too forward. The detail, transients and layering are all on point again. Listening to “Fleetwood Mac – The Chain” displays spectacular vocals which are a little forward, I would say just enough to give them life and dimension. The weight on all notes is spot on, keeping the presentation extremely natural.


With the right tips, the treble is also extremely good, it extends very well, has a good amount of sparkle and plenty of air. The detail is all there while having a quite smooth (but not overly so) presentation. It feels really well extended, with very natural attack and decay making cymbals a pleasure to listen to.

Imaging and Soundstage

This is definitely the Thummim special sauce, the stage is absolutely fantastic, it has a very holographic and 3D nature to it rather than being flat in one dimension. The sounds happen can happen all around your head as if the instruments just were there. This also provides an amazing separation to each instrument, giving it air and volume.


I rarely add comparisons but I felt the Thummim warranted one, I’ll keep it to sonics and usability.

VE Erlkönig

(Thank you for the rental Audio Concierge) The Erlkönig has a more “classic” audiophile tuning, it tries to stay within a more neutral and controlled signature whereas Thummim is a more wild signature and presentation. Erlkönig felt a tiny bit more detailed, but didn’t have the punch and spacial imaging present in Thummim. Those two beasts would definitely complement each other well.

Sony IER-Z1R

Those two flagships are in two completely different price points, however, I don’t personally think the Z1R is far behind the Thummim. Overall the Z1R is just a tiny bit less detailed than Thummim, and doesn’t have as holographic stage. The midrange is also quite a bit pleasant and full on the Thummim where Z1R can feel a bit too thin for some. 


The Thummim is not something many people will ever consider, it’s in the realm of extremely expensive luxury items most of us look towards with awe. However, for those who even consider it, it presents a unique, fun and very engaging sound with a very holographic presentation of the music, unlike almost all IEMs I’ve heard to date. I feel the accessories it comes with should be improved, especially considering what another VE Erlkönig comes with at a similar price point. 
Having said all that, I absolutely loved the Thummim, and I wish I could own one at some point.

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