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

Fidelio X3 Hi Res | Desertcart Senegal

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate your audio game — hear every detail, feel every beat.

SUSTAINABLE LUXURY - Premium Muirhead Scottish leather headband sourced ethically for a sophisticated look and conscious comfort.
IMMERSIVE SOUNDSTAGE - Open-back design with acoustically transparent Kvadrat fabric creates a spacious, natural listening environment like no other.
STUDIO GRADE CLARITY - Experience pristine, uncolored sound with exquisitely tuned 50mm polymer diaphragms delivering detailed highs and smooth mids.
VERSATILE CONNECTIVITY - Includes detachable balanced/unbalanced oxygen-free cables and adapters for seamless use with studio gear or mobile devices.
HI RES CERTIFIED PERFORMANCE - Hear every nuance with Hi-Res Audio certification, perfect for professional mixing and audiophile-grade listening.

The Philips Fidelio X3 headphones combine professional studio-grade sound with luxurious, sustainable materials. Featuring 50mm multi-layer diaphragms and an open-back design, they deliver a wide, natural soundstage and Hi-Res Audio certification for crystal-clear, immersive listening. Designed for both studio pros and discerning audiophiles, these wired headphones come with versatile cables and premium finishing, making them the ultimate choice for recording, mixing, and high-fidelity music enjoyment.

Specifications

ASIN	B0884XTXS8
Additional Features	Foldable
Age Range Description	Adult
Antenna Location	Music
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#10,490 in Electronics ( See Top 100 in Electronics ) #388 in Over-Ear Headphones
Brand Name	PHILIPS
Built-In Media	Cable
Cable Features	Retractable
Carrying Case Color	Black
Carrying Case Material	Leather
Color	Black
Compatible Devices	Devices with 3.5 mm audio jack or adaptable to it
Connectivity Technology	Wired Hi-Res Music Studio Headset
Control Method	Touch
Control Type	Media Control
Customer Package Type	Standard Packaging
Customer Reviews	4.3 4.3 out of 5 stars (2,574)
Earpiece Shape	around the ear
Enclosure Material	foam
Frequency Range	5 Hz - 40 kHz
Frequency Response	40000 hertz
Global Trade Identification Number	04895229102781, 14895229102788
Headphone Folding Features	Over Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	31.97 ohm
Item Type Name	Headphones
Item Weight	13.4 ounces
Manufacturer	Philips
Model Name	Fidelio X3
Model Number	X3/00
Noise Control	None
Number of Items	1
Sensitivity	103
Series Number	6923410710205
Specific Uses For Product	Entertainment, Professional
Style Name	Over Ear
Theme	Studio Monitor
UPC	840063201309
Unit Count	1 Count
Warranty Description	1 year warranty
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth

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Customer service was outstanding when I had questions about the product.

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The product quality is outstanding. Exactly what I needed for my work.

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