How does this compare to the M50?

It depends on your application. First, the M50 is now the M50x, which includes improved ear cups as well as three interchangeable cables (short, long, coiled). The M50's have a bit better isolation than the M40's. Sonically, the M50's has the flatter response on provides less coloration to the music than the M40. I.e., the M50 is very, very precise. You will hear the source faithfully and any coloration and soundstage needs to come from there because these cans, by design, will not provide it. The M40 is a bit more musical and will be more forgiving with consumer grade gear. In studio or for technical/critical listening, I'd go with the M50x. For a live stage or personal listening, I'd seriously consider the M40x.

I have a big head. Will the ATH-M40x work for me?

I have an abnormally large head, probably top 5% of the population. The ATH-M40x at maximum extension are a tiny bit snug. It's actually a really good fit. If you have a "big" head, you're fine. If you regularly find you can't wear other brands of headphones, the M40s aren't especially roomy. Try them and be prepared for a return if necessary.

What about "noise pollution"? Will other people on the bus be able to identify the music i'm hearing, what is the critical volume these hp will out??

As with all things, moderation is appropriate. If you want to throb your head and damage your hearing later in life, then things are different. Normal sound levels, with the ear pads cupped together, you cannot hear music, coming from the head phones, inches away from your ears. While on your head, you will hear the full range of music. Pay attention, you will feel the music, crisp and sharp, highs and lows, with good L/R separation. So unless your head is swiss cheese, even if it was, I think no one will hear anything coming from them, but you. I am speaking from experience, rural Sunday morning bedroom with the window open, light breeze through the trees, birds are content. I guess mating season is over.On the bus, with head splitting music? I think you are safe listening to top secret national defense briefings, in addition to any other music you can think of. That is, the bus is expected to be diesel/gas, in first or second gear, going 25+ MPH, and there are at least 10 people on board keeping to themselves. The headphones have good noise isolation, so your sound levels, depending on environment, will vary. You cannot hold a conversation, as that would be both difficult and rude, while wearing.All that to say NO, you are safe. The notion of critical volume is subjective. Since the object is to not damage hearing, critical volume is beyond the scope anyone should be using them. With that said, at 75% max volume on an iPhone in a relatively quite room, you will be able to identify the music for sure, with the ear pads cupped. Between 60% to 70% volume, you will not comprehend what is being listened too. At 50% you will hear no sound at all. On the bus, I suspect 75% to 90% is safe, while 100% volume could be heard quite clearly by the person sitting next to you. You could share your music with the ear cups opened out flat around you neck, without damaging anything.

How do these headphones do with classical/acoustic music? Is the sound natural and sufficiently good?

When i first got these headphones I listed to Ludovico Einaudi's CD and it sounded great, then I listed to The Early November acoustic Ep and that sounded amazing.

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ネ**ス

軽くて音質もよく手入れもしやすい

つけ心地がとてもよく重宝してます！

11.09.2025

M**I

低音がよく響く

口コミ通り、低音が良く聞こえます。子供用キャップが入るほど頭のサイズが小さ目ですが、このヘッドホンはギュっとキツメに感じました。つまり、頭のサイズが大きめの人だと、キツク感じるのではと思いました。

7.06.2025

ゆ**ん

めっちゃ気持ちいい音♪

どうしてもM50xと比べたくなるよね。自分も両方買って試してみた。結果、自分の用途(音楽鑑賞・映画鑑賞)にはM40xの方が気持ちよかったです。50xは低音を盛ってるから個人的には気持ちよくないです。ドンシャリ系が好きな人、ロックやヒップホップが好きな人とかにはいいかも。40xも低音が鳴らないわけではないです。ほんとに適度に気持ちよく鳴ってくれます。解像度とかは差があるんだろうけどそこまで音響にこだわってない自分みたいな人にはほとんど差はわからないと思う。むしろ広がり感(臨場感？)とか気持ちよさは何故か40xの方があるんですよねぇ。多分好みの差なんだろうけど。M50xは売っちゃいました。

14.07.2025

V**ー

麺硬脂少な目❓️

バランス的にトレブル少し強い、ベースは聴こえるがバスドラ控え目ってとこでしょうか。聴き疲れはありません。密閉型と言うことで低音域に期待をしつつありゃ❓️がありと言えばありですね〜AKG、SUREとは違ってて面白い。頑張れ国産メーカー‼️音楽的にはSURE❓️モニターとして中々だと思います。バランスケーブルも安価で試せるし〜お勧めしときます。麺硬、あっさりです〜

12.09.2025

絵**き

音質は◯、耐久性は×

過去に2度購入していますが、2度とも耳に当てる部分の可動部が破損しました。1度目はともかく2度目は大事に扱ったのに、ですいずれも2年以内に壊れているので、購入される際は2年に一度1万5千と考えましょう音質はめちゃくちゃいいので3度目の購入をします

31.07.2024

ハ**ド

指挟まれるの以外は◎

10年使った古いオーテクのヘッドホンから買い替えです。音はさすがクリアで癖がなく、普通に使うのには申し分ないクオリティだと感じました。1点だけ想定外に残念なところがあり、折りたたみ式の回る部分に時々指挟まれて痛い!w自分が不器用なだけかもしれませんが、時々イラッとするので★は4で…！

5.03.2025

T**N

毎日使っています

以前使っていたヘッドフォンが壊れたためこちらの商品を購入。ワイヤレスで移動しながらでも音が聞けてよかったです。

20.09.2025

A**X

amazing

28.03.2025

Noise Control	Sound Isolation
Headphones Jack	3.5 mm Jack
Model Name	ATH M40x
Connectivity Technology	Wired
Included Components	Curl Cord (removable): 4.6 ft (1.2 m) per unit, Protective Case, Straight cord (removable): 10.8 ft (3.0 m) per unit
Age Range (Description)	Adult
Material	Aluminum
Cable Feature	Detachable
Item Weight	0.24 Kilograms
Number of Items	1
Batteries	1 Lithium Ion batteries required.
Item model number	ATH-M40x
Is Discontinued By Manufacturer	No
Color Name	Black
Connector	Code
Hardware Interface	3.5mm Audio
Material Type	Aluminum
Size	Regular
Color Screen	No
Computer Memory Type	DIMM
Voltage	240 Volts

ATH-M40x

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