are these compatible with iphones (5 or 6) and samsung galaxy phones?

These are true studio monitor headphones! They have no inline controls and a long, straight, somewhat heavy cable with a heavy metal 1/4" phono connector. So, although they will work with ANY phone, they are not the best suited to portable use. They don't fold up and you'll need an adapter to plug them into your phone (they don't come with one, or anything else for that matter). They also have fairly flat frequency response; for most people this is experienced as cold, "sterile" sound with not enough bass! If you are set on these, might I suggest the MDR-7506 model. They are almost identical physically, but fold up, have a coiled (but still heavy) cord and a "warmer" more pleasing sound. They also come with an integrated mini phone adapter (just unscrew the 1/4" connector!) Still, not the most portable and no inline controls, but you'll save some money and probably like them better.

Is it possible that after 10-hour flight bass become weaker? Thank you.

Weaker? No. I have owned 3 pairs in my life over the last 2 decades. Highly doubt this will happen in a 10 hour time period but over time, the pads can flatten and therefore the drive becomes just a half-millimeter to one millimeter closer to your ear causing it to sound like there is less bass and more prominent mids and highs. I say this because when my pads deteriorate over time and I've bought new stock pads, It sounds like the highs become slightly recessed making it sound like there is more bass.

Mdr Cd900st Studio Monitor Stereo Headphones Japan Import

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Description

🎶 Hear what the pros hear — the studio secret you can't miss!

ROBUST 40 MM DOME DRIVERS - Dynamic drivers with CCAW voice coils deliver detailed, balanced sound that pros rely on.
PROFESSIONAL FIT FINISH - Adjustable, numbered steps ensure perfect fit every time, combining vintage style with modern usability.
ICONIC JAPANESE ENGINEERING - Authentic Japan import with the legendary 'FOR DIGITAL' 80s sticker—own a piece of audio history.
STUDIO GRADE PRECISION SOUND - Experience crystal-clear audio with a wide 5-30kHz frequency range, trusted by top Asian studios.
LIGHTWEIGHT COMFORT FOR MARATHON SESSIONS - At just 200g, these headphones stay comfortable during long editing or mixing hours.

The Sony MDR-CD900ST is a professional-grade, Japan-imported studio monitor headphone featuring 40mm sealed dynamic drivers, a wide 5-30,000 Hz frequency response, and 1000mW max input power. Lightweight and comfortable at 200g, it’s the go-to choice for Asian studios and audiophiles seeking precise, balanced sound with authentic vintage flair.

Specifications

ASIN	B000UPEJCU
Additional Features	Lightweight
Age Range Description	Adult
Antenna Location	Recording
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#69,476 in Electronics ( See Top 100 in Electronics ) #758 in On-Ear Headphones
Brand	Sony
Brand Name	Sony
Built-In Media	Cable
Cable Features	Detachable
Color	Black
Compatible Devices	Wired Devices
Connectivity Technology	Wired
Control Method	Remote
Control Type	Touch Control
Controller Type	Volume control
Customer Reviews	4.3 out of 5 stars 1,473 Reviews
Ear Placement	Over Ear
Earpiece Shape	Rounded or oval
Enclosure Material	Format: sealed dynamic driver unit: 40 mm, dome type (CCAW accepted) Maximum input 1000 mW, impedance: 63 Ω, sound pressure sensitivity: 106 dB/mW playback frequency: 5 ~ 30,000 Hz, cable length: (without cable) approx. 200 g: approx. 2.5 m, Connector: standard stereo plug, ground
Form Factor	On Ear
Frequency Range	5hz - 30khz
Frequency Response	30000 Hz
Headphone Folding Features	On Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	63 Ohms
Is Autographed	No
Item Weight	290 Grams
Manufacturer	Sony
Model Name	MDR CD900ST
Model Number	MDR-CD900ST
Noise Control	None
Number of Items	1
Series Number	900
Specific Uses For Product	Recording
Style Name	Modern" or "Contemporary
Theme	Music, Portability, Professional
Unit Count	1.0 Count
Water Resistance Level	Not Water Resistant

Reviews

A**Z

31.07.2014

W**O

27.11.2023

T**N

30.07.2024

J**Y

7.11.2023

E**G

4.03.2024

A**R

18.04.2025

K**X

30.04.2022

P**N

28.03.2023

M**L

12.06.2022

さ**ズ

24.04.2026

C**S

2.08.2024

C**H

14.02.2026

C**O

13.07.2021

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MDR-CD900ST Studio Monitor Stereo Headphones (Japan Import)

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