Sony IER-M9
$$$ Flagship
tldr; Professional stage IEM. Balanced armature excellence, studio monitoring. Sony's pro pick.
Check pricesSentiment Breakdown
50%Positive
Positive
50%Neutral
47%Negative
3%Based on 120 Reddit opinions
Strengths & Weaknesses
Scores based on sentiment analysis of topic-related comments
Key Features
- 5x Balanced Armature (BA) Driver Units
- Magnesium alloy diaphragm super tweeter
- Sony's original design BA Driver Units
- Light and durable Magnesium alloy outer housing
- Preformed ear hanger for stable fit
- Magnesium alloy BA drivers for optimized sound path
- 4.4mm standard balanced connection
- In the box: Triple Comfort ear buds: SS, S, MS, M, ML, L, Hybrid Silicone ear buds: SS, S, MS, M, ML, L, LL Clip Carrying case, Cable holder, Cleaning cloth, Cable clip
Sentiment Over Time
Historical Price Data
Sony IER-M9
Sony IER-M9
All-time low: $899(2020-06)
What Redditors Actually Say
What Redditors Say
Best praise vs top criticism for Sony IER-M9
Best Praise
+22 pts“Sony IER-M9 Sony WM1A I've been listening to the M9 for a month now and I absolutely love them. They sound very natural and balanced. Transients are neither too much or too little, allowing instruments to be well defined and distinct from one another despite it's warm tuning. The sub-bass rumble doesn't compare to the Z1R which I also own, but I am actually liking the bass on the M9 more. The bass on the M9 sound more precise. Sometimes the bass on the Z1R can be overwhelming and interfere with other parts of the mix. The M9 has the best vocals out of the iems I've tried so far. I mostly listen to Jpop and listen to female vocals 95% of the time. Getting the M9 when most of my library is female vocals may seem counterintuitive, but female vocals sound smooth and do not have any graininess/haziness to me. Male vocals were also exceptional and the best I've heard so far. The fit was quite finicky for me, especially with silicone tips. I didn't spend much time testing with silicone tips since the M9 is unvented, but the treble felt too sharp to my taste with silicone tips. The M9 doesn't allow you to deeply insert it, so most of the tips I had were uncomfortable. I have tried Comply foams, Azla Foamax, and Sonicfoams with the M9 and currently use Sonicfoam tips. In terms of treble dampening, Sonicfoams dampened the least while Comply tips dampened the most. The WM1A has been very nice especially when I'm on the train and the internet is garbage. The battery life is long and it has enough power for my iems. I don't ever go beyond 40 on low gain.The mrWalkman firmware has been installed and is on the WM1Z tuning. I'm not sure whether there is a difference between the different firmware tunings, but it feels like the WM1Z tuning makes it a bit brighter. I only notice this with my favorite song which isn't mastered the best and even then the difference, if any, is very small. The same could be said when comparing it to the apple dongle, but listening to the WM1A sounds "better" to me even if there isn't an actual difference. Music I listen to [Dearly Love - Dr. Flowers (streaming master has too much bass unfortunately)](https://www.youtube.com/watch?v=mAfPjHc0JEQ) [Paipai kamen wa dou kashira - Houshou Marine](https://www.youtube.com/watch?v=hv2vo94FOF4) [III - Houshou Marine](https://www.youtube.com/watch?v=lUDPjyfmJrs) [Let me Battle - 9Lana](https://www.youtube.com/watch?v=zkT97TqVNXw) [Bang - EGOIST](https://www.youtube.com/watch?v=8CfHTQGoPv4) [My Dearest - supercell](https://www.youtube.com/watch?v=WmZQFfypvhg) [No Doubt - Official Higedandism](https://www.youtube.com/watch?v=EHw005ZqCXk) [Dancing Hero (Eat you up) Dear Pop Singer Version - Yoko Oginome](https://www.youtube.com/watch?v=-vWvdnrIu3s) [Sasayaka na hajimari (TV anime version) - Visual Arts/Key](https://www.youtube.com/watch?v=AGBV1spNH1k) [Koino uta - Yunomi](https://www.youtube.com/watch?v=NQSeENqfskI) [Next Color Planet - Hoshimachi Suisei](https://www.youtube.com/watch?v=4-BVYLmQNV8) [Daybreak ~ Grand Finale - Falcom Sound Team jdk](https://www.youtube.com/watch?v=gQxcsGqSYs0&list=PLzFTGYa_evXhFx5VEw66y_K37qGFPGB19&index=36) [Arc en Ciel - Falcom Sound Team jdk](https://www.youtube.com/watch?v=0To8SJiRUKw)”
r/headphones
ViewTop Criticism
+2 pts“Wish I could tell you. I could never justify the cost. I did buy the M9, and they do what Sony does. They're a bit weird sounding, well, Sony sounding I guess. It's technically pretty good, but I don't really like them. I can't fathom having the Z1R doing anything special enough to warrant the cost. For my own listening, the UE 18T still stands out. I also have the Monarch MKII which are technically good. For fun, I still prefer the SE846 in most cases. I should give the RE2000 a try. I liked Hifiman for a long time using all their old stuff...right up until the HE-600 which sounds like cheap garbage. I stopped after that and never bought another product from them. It felt like they chose to go fancy cases and cheap drivers, and I was done with that bs.”
r/headphones
View12 more quotes available below
Related Products
Frequently Asked Questions
Is the Sony IER-M9 worth buying?
Professional stage IEM. Balanced armature excellence, studio monitoring. Sony's pro pick.
What do Redditors love about the Sony IER-M9?
Redditors highlight: ?? Stage monitoring. ?? Balanced/neutral. ?? 5BA drivers.
What are the downsides of the Sony IER-M9?
Some criticisms include: "Wish I could tell you. I could never justify the cost. I did buy the M9, and they do what Sony does. They're a bit weird sounding, well, Sony sounding I guess. It's technically pretty good, but I ..."
How accurate are these ratings?
Our sentiment analysis is approximately 80-85% accurate compared to manual review. Products with more mentions (Sony IER-M9 has 120) tend to have more reliable scores.
120 Reddit opinions analyzed • Last updated 3/24/2026