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.

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Description

🎧 Hear what the pros hear — elevate your sound game with Sony MDR-CD900ST!

WIRED RELIABILITY - Stable, interference-free connection for uninterrupted, high-quality audio sessions.
PRECISION ENGINEERING - Crafted with advanced Sony technology for flawless sound reproduction and monitoring.
ICONIC STUDIO STANDARD - The go-to headphones for Sony Music Studios, ensuring you hear every detail as the pros do.
PRO GRADE AUDIO FIDELITY - Experience crystal-clear, studio-accurate sound trusted by top recording studios worldwide.
SLEEK PROFESSIONAL DESIGN - Timeless black finish that fits perfectly in any creative workspace or studio setup.

The Sony MDR-CD900ST Studio Monitor Stereo Headphones deliver industry-leading, professional-grade audio fidelity. Developed in collaboration with Sony Music Studios, these wired headphones provide precise, full-range sound reproduction favored by recording professionals worldwide. Their sleek black design and advanced technology make them the ultimate choice for serious audio monitoring.

Specifications

Control Method	Remote
Compatible Devices	Wired Devices
Antenna Location	Recording
Enclosure Material	Format: Sealed dynamic type driver unit: 40mm, dome type (CCAW adopted) Maximum input: 1,000 mW, impedance: 63Ω, sound pressure sensitivity: 106dB/mW Playback frequency: 5 ~ 30,000 Hz, Cord Length: (without cord) about 200g: about 2.5m, Plug: stereo standard plug, mass
Water Resistance Level	Not Water Resistant
Is Electric	No
Specific Uses For Product	Recording
Cable Features	Retractable
Additional Features	Lightweight
Earpiece Shape	Rounded or oval
Headphones Ear Placement	Over Ear
Headphone Folding Features	Over Ear
Frequency Range	5hz - 30khz
Frequency Response	30000 Hz
Impedance	63 Ohm
Noise Control	Active Noise Cancellation
Audio Driver Type	Dynamic Driver
Connectivity Technology	Wired
Headphone Jack	3.5 mm Jack
Color	Black
Theme	Professional Equipment
Item Weight	261 Grams
Cable Length	2.5 Meters
Unit Count	1 Count

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