The Mach 50 is a five-driver balanced armature IEM from Westone. It is very small and lightweight, similar in form to Shure IEMs. Like Shure, Westone caters to audiophiles and professionals alike. The Mach 50 has a list price of 879 USD but is sometimes on sale.
You can check current price and availability on Amazon: MACH 50
The Mach series was launched in 2022 and consists of the Mach 10, 20, 30, 40, 50, 60, 70, and 80. The number indicates the driver count when divided by ten. The 30, 50, and 70 are tuned to be slightly bass-forward, while the rest are tuned to studio-grade neutral. The odd-numbered models also use a larger single bass driver instead of two smaller ones, which gives a richer and fuller low end but with slightly less precision.
I have previously reviewed the top model in the MACH series, the MACH 80: MACH 80 Review
Westone also offers the Pro X series and AM Pro X series. The Pro X series is tuned to be bassier and lusher than the MACH series, while the AM Pro X series features an ambient filter that intentionally lets in sound from the surroundings. All Westone IEMs use T2 connectors and have 3mm nozzles, making them compatible with Shure ear tips.
WESTONE MACH 50 SPECIFICATIONS
- Type: compact in-ear monitor
- Drivers: 8 balanced armature drivers with 3-way crossover
- Driver configuration: 1 bass, 2 mids, 2 highs
- Impedance: 32 Ohms @1kHz
- Sensitivity: 110dB @1kHz
- Freq Response: 8Hz – 20kHz
- Cable length 127cm / 50 inches
- Cable name: Linum® Estron SUPERBaX™
- Cable connectors: T2 type
- Cable termination: 3.5mm jack
- Nozzles: 3 mm (Shure compatible)
IN THE BOX
- Tips: 5 Pair Foam + 5 Pair Silicone
- Impact resistant Pelican™ Case
- Cloth pouch
- Cable band
- Cleaning tool
Current price and availability:
- Amazon: MACH 50
BUILD AND COMFORT
Modern IEMs are often quite large, but the MACH series is very compact and does not protrude from the ears at all. All models in the MACH series use the same sized housing made from durable plastic. They fit very snugly in the ear.
The nozzles are also smaller than usual. The Mach series uses legacy nozzles with an outside diameter of 3mm, similar to Shure, which means you can use both Westone and Shure ear tips. However, an adapter is needed for most third-party ear tips, as these are designed for larger nozzles. Some companies offer adapters, including Spinfit and AZLA, but they are only included with a select few tip types.
It might be smart of Westone to include nozzle adapters with their IEMs, giving users a broader choice of ear tips for those who do not get a perfect fit with the included options.
I personally found a very good fit in the Azla Crystal 2 tips which includes adapters, as do the AZLA Origin and SpinFit Neo tips.
The cable is very thin and light, made by Danish manufacturer Linum. The connectors are somewhat special, resembling a miniature version of MMCX. They are called Estron T2 connectors, are very small, and are IP68-rated and claimed to be highly durable.
The Mach 50 comes with a very solid Pelican case, a cloth bag, a cable band, a cleaning tool, and a selection of ear tips.
ABOUT WESTONE
Westone is one of the pioneers of in-ear monitoring technology. Founded in 1959, the company helped shape the industry through innovations such as the first custom earpieces for portable music players, early balanced armature in-ear monitors, and the first custom monitors for major touring musicians like Rush and Def Leppard. Westone also worked with Jerry Harvey to help launch Ultimate Ears and collaborated with brands like Shure on some of the first dual-driver universal IEMs.
The company released its own earphone lineup in 2002 and has kept releasing new lineups targeting professionals, studio workers, on-stage artists, and audiophiles. While ownership has shifted hands multiple times, they have stayed true to what they do. Westone was acquired in May 2026 by Fidelity Collective, which also acquired Etymotic.
LISTENING IMPRESSIONS
Associated equipment:
- Amplifier: Topping A90
- DAC: RME ADI-2 DAC FS
- Tips: Azla Crystal
Caravan by Jesca Hoop
I am a bit addicted to this beautiful singer-songwriter album, especially when listening to it through the MACH 50. It is simply beautiful, very well balanced and detailed. Nothing sounds harsh or offensive, yet it still feels very neutral and never dark or colored.
Eye of the Day by Marta del Grandi
The percussion is snappy and the vocals are beautiful, with great timbre and exquisite detail.
In The Mountains by Espen Eriksen Trio
The bass is powerful as it should be, but never overpowering. Many earphones have stronger bass than this. The piano is liquid and velvety, with great timbre and wonderful nuance.
Re-Melt by Tord Gustavsen Trio
Very well balanced, it feels nicely laid back and very seducing.
Teardrop by Massive Attack
Very punchy bass and percussion, but in a slightly laid-back and delicate way. The vocals are lovely.
The Hidden Camera by Photek
Again it is very well balanced, punchy and well separated but also very smooth and organic with a laid-back touch. The percussion on this track can often sound a bit dry and sharp, but through the MACH 50 it sounds perfect.
Spontaneous Compositorius by Thomas Agergard
The saxophone timbre is excellent, nicely rich and natural. The bright percussion is smoother and less sharp than with many earphones, clean and never aggressive. The bass is well balanced, neither overly powerful nor too laid-back.
Sujet Tabou by Renaudin and Cahours
This fascinating album consists of acoustic guitar and percussion only, with some vocals supporting the melody. It is very dynamic. On the MACH 50 it sounds quite snappy but in a smooth and delicate way.
How Deep by John Scofield
Very nice. Slightly warm and laid-back in feel, with the MACH 50 bringing out that wonderful tube amplifier glow in the electric guitar.
Outlaws by Bill Frisell
Good instrument separation, very nicely balanced with a slightly laid-back feeling to the presentation. It is very seductive.
Limit to Your Love by James Blake
The vocals are slightly warm and darker than many, but in a good way. The demanding bassline is rendered nicely. Quantity is not at basshead levels, and the quality is decent. It is a very challenging bassline and most earphones cannot handle it without some audible distortion.
Bullet in Your Head by Rage Against the Machine
Smooth and pleasant. The bass is punchy but not overpowering, and the vocals are nice.
Young Vivaldi by Modo Antiquo
The MACH 50 has very nice string timbre, slightly laid-back and not overly crisp, but still with excellent detail. It feels refined in a smooth way.
Summer 3 Vivaldi Recomposed by Max Richter
By now I have concluded that the MACH 50 is a slightly dark-leaning earphone, and most dark-leaning earphones can sound a bit muddy on this track. Not so with the MACH 50. It is clean and well separated, smooth and refined sounding.
WRAPPING IT UP
Sound Signature
I find the MACH 50 to sound quite neutral but slightly on the dark and smooth side. Even though it is an odd-numbered MACH series IEM and is supposed to have a bit more bass, it is certainly not a basshead monster, coming across as more natural and well balanced than overly bassy.
Treble
The treble is clean and smooth, slightly laid-back compared to many earphones. Personally, this is how I prefer it: not sharp and aggressive, but present and detailed, as well as pleasant and enjoyable.
Midrange
The midrange is beautiful, with a nice hint of warmth that can occasionally feel slightly dark, but mostly it comes across as natural, nuanced, and refined in a very satisfying manner.
Bass
The bass is good in quality but not class leading. The quantity, however, feels perfect, with every track coming across as very well balanced in terms of bass presence.
Soundstage and Imaging
The soundstage is reasonably large for an IEM at this price and imaging is totally adequate, but neither is a standout feature. Both are good without being mind-blowing.
Detail, Dynamics, and Timbre
It is difficult to comment on the detail level when the price varies so much. At the list price of over 800 USD, the detail retrieval is not particularly impressive compared to class-leading IEMs. At a sale price of just above 400 USD, however, it is very good.
That said, if you consider that the MACH 50 is much smaller than most competitors, you might find the complete package satisfying regardless.
The standout aspect for me, however, is not how much detail there is, but how it is rendered: in a smooth and nuanced manner rather than sharp and in your face. The MACH 50 is a very delicate sounding IEM.
When it comes to dynamics, the MACH 50 are not mind-blowing, but do not feel lacking either.
I find the general tuning and especially the midrange timbre of the MACH 50 to be very good. Things feel natural and present without being too sharp or crisp. The timbre is also very coherent across the frequency range.
COMPARISONS
Associated equipment:
- Amplifier: Topping A90
- DAC: RME ADI-2 DAC FS
- Tips: SpinFit CP145
- Tips: Azla Crystal
TIPSY M3 vs MACH 50
The Tipsy M3 is a three-driver hybrid IEM, using a 9.2mm dynamic driver with a titanium-plated PET diaphragm along with dual balanced armatures. It is currently priced at 189 USD, which is significantly less than the MACH 50. However, I think the M3 performs well above its price class, which makes for an interesting comparison.
Comparing them, I really like the MACH 50 for its smooth and slightly warm take on neutrality, but I am equally impressed by the dynamics, bass quality, and general tonality of the more fun-tuned M3. The M3 certainly offers more value for money, but the MACH 50 remains more neutral and renders the midrange better. It is also much smaller.
I have written a dedicated comparison review here:
- Amazon: Tipsy M3
KIWI EARS ORCHESTRA II vs MACH 50
The Kiwi Ears Orchestra II is a 10 driver balanced armature IEM priced at 349 USD. I reviewed it here:
When it comes to sound, the MACH 50 and Orchestra II are relatively similar, both great sounding and quite neutral. The Orchestra II generally performs better on technical parameters such as detail and imaging, while the MACH 50 has a sweeter midrange tuning.
What sets them apart most is, of course, the physical shell size. The Orchestra II is a very large IEM while the MACH 50 is a very small one. The MACH 50 also comes with a much more professionally oriented accessory pack.
I have written a dedicated comparison review here:
Kiwi Ears Orchestra II vs MACH 50
- Linsoul: Kiwi Ears Orchestra II
- Amazon: Kiwi Ears Orchestra II
WESTONE Pro X50 vs MACH 50
The Westone Pro X50 is very similar in design, both internally and externally, to the MACH 50. It is however slightly smaller and tuned quite differently.
When comparing the two, the Pro X50 sounds richer and fuller, warmer and bassier, while the MACH 50 is much more neutral. This difference is of course intentional, as the two earphones target different audiences. The Pro X50 has a thicker, punchier sound that may appeal more to professional on-stage users, but personally I find it very appealing for normal music listening as well.
I have written a dedicated comparison review here:
- Amazon: Westone Pro X50
WESTONE MACH 80 vs MACH 50
The MACH 80 looks identical to the MACH 50, but as the name suggests it has eight drivers instead of five. When comparing them it is very apparent that they share a lot. The tuning is pretty similar, but the MACH 80 has more detail, as you would expect given the significant price difference.
I reviewed the MACH 80 here:
- Amazon: MACH 80
AMPLIFICATION
The Westone MACH 50 has a specified impedance of 32 ohms and a sensitivity of 110dB, both measured at the standard frequency of 1kHz. On paper it should not be very difficult to drive.
So far in this review I have powered it with my desktop rigs, but since many users would be interested in portable options, here are some impressions:
The tiny Letshuoer DT01 Pro works quite well, although it is a significant step from to the desktop rig. The Kiwi Ears Allegro Pro is snappier and clearer than the DT01 Pro, as is the Fosi DS3. The xDuoo Link2 Bal2 may be a bit better – it feels slightly more refined. The Alpha XI1 ONIX is dynamic and nicely smooth.
The Dragonfly Cobalt is a step or two up from the previous DAC/Amps, and a very good option for the MACH 50. However, the Chord Mojo is even better and matches the MACH 50 exquisitely.
All in all, the Westone MACH 50 is quite easy to drive and performs well with all DACs and amplifiers tested. It does however scale with better source equipment, and if you want it to perform at its best, quality source gear is recommended.
CONCLUSION
The Westone MACH 50 offers a neutral yet smooth, natural, and fatigue-free listening experience in an exceptionally compact package. If small shell size and professional accessories are important to you, it has few real competitors.
However, the varying price makes it difficult to give a conclusive recommendation. At the list price of 879 USD, the competition is fierce and there are other IEMs that may perform even better, given that you can tolerate larger shells. If you can get the MACH 50 on sale at 400 to 500 USD, however, it is hard to beat.
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- Amazon: MACH 50
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