No. There is no power involved with these headphones. The wires are plugged into a "source" like a phone, digital music player, receiver etc.

Do these comfortably fit a head that wears a hat size of 8 1/2?

Can’t say for sure as I’m 7 3/4 but I’m able to wear them comfortably for 6-8 hrs at a time. Seems plenty fo room to spare

I don't really get it, Fifelio X3 description says "balanced and unbalanced cables included", the balanced one is 2.5mm or 4.4mm?

On the headphone side, both cables are 3.5mm TRS. But on the amp side, yeah, the balanced cable terminates in a 2.5mm balanced. No idea why they made that decision, but I picked up a 2.5 balanced to 4.4 balanced converter that seems to work fine

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Description

🎶 Elevate Your Listening Experience!

OPEN BACK DESIGN - Enjoy a wide and natural soundstage for immersive audio.
COMFORT FOR HOURS - Soft memory foam ear-cups for extended listening sessions.
DYNAMIC BASS POWER - Feel the rhythm with powerful 50-mm acoustic drivers.
UNLEASH YOUR SOUND - Experience every note with precision and clarity.
STYLISH FUNCTIONAL - Acoustically transparent Kvadrat fabric for a modern touch.

The Philips Fidelio X3/00 Hi-Res Audio Headphones are designed for audiophiles, featuring 50-mm acoustic drivers for balanced sound and dynamic bass. With a lightweight design and soft memory foam ear-cups, they provide comfort for long listening sessions. The open-back design enhances soundstage, while the stylish Kvadrat fabric adds a contemporary flair. Perfect for wired connectivity, these headphones are a must-have for music lovers.

Specifications

Control Method	Touch
Control Type	Media Control
Unit Count	1.0 Count
Item Weight	1.38 Kilograms
Frequency Range	5 Hz - 40 kHz
Frequency Response	40000 Hz
Impedance	30 Ohm
Noise Control	None
Headphone Folding Features	Over Ear
Earpiece Shape	around the ear
Headphones Ear Placement	Over Ear
Carrying Case Color	Black
Style Name	Fidelio \| Wired Hi-Res Audio
Theme	Studio Monitor
Color	Black
Wireless Technology	Bluetooth
Connectivity Technology	Wired
Headphone Jack	3.5 mm Jack
Water Resistance Level	Not Water Resistant
Carrying Case Material	Leather
Is Electric	No
Antenna Location	Music
Compatible Devices	Cellphones
Cable Features	Detachable
Additional Features	Tangle-Free Cord, Lightweight
Enclosure Material	Kvadrat fabric, Stainless Steel, Leather
Specific Uses For Product	Music

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