Is the cable detachable and how long is it?

No it isn't detachable and it's 3 m long and a straight cable (Pro has a 3 m coiled cable)

Would both Denon and Marantz mini systems, rated 30 W per channel be powerful enough to drive the 250 ohm version?

Mine is 32 ohm version, working on portable device perfectly. I think you should plug the 250 ohm version into the earphone jack of your mini system.

The bass is fairly flat compared to the source recording. These are monitor headphones. The frequency response is fantastic but getting this response to actually play out is rather challenging due to high ohm requirement. So you'll need a good source and a strong, high ohm amplifier for these phones.

Hello ,i have a musical fidelity x can headphone amp ,would it be compatable with these headphones ?

I'm not sure but you may find it hard to drive these head phones. I looked online and I could not find any headphone output rating for the item. It just says 100mW into 40 ohms....s/n ratio is low so I would say u would need a 32ohm pair to get them to be driven well. Best thing you can do is try a pair and send them back if you can not get a decent volume and detail out of them. Good luck... ; )

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beyerdynamic

Product ID: 48150847

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Details

Brand
beyerdynamic
Colour
black
Ear placement
Open Ear
Form factor
Over Ear
Impedance
250 Ohms
Noise control
None

⚡250 Ohm impedance for high-fidelity audio

🎧Open-back design for spacious sound

🔗Detachable cable with 3.5mm jack

Description

🎶 Elevate your soundscape — because your music deserves the best.

MADE IN GERMANY QUALITY - Craftsmanship that guarantees longevity and superior sound performance.
PREMIUM ALUMINIUM BUILD - Durable, lightweight comfort designed for marathon listening sessions.
UNIVERSAL COMPATIBILITY - Seamlessly connects to laptops, gaming consoles, smart speakers, and more via wired 3.5mm jack.
IMMERSIVE OPEN BACK ACOUSTICS - Experience music with a speaker-like spaciousness that transforms your home listening.
PRECISION TUNED 250 OHM DRIVERS - Engineered for pop and rock lovers craving crisp highs and powerful bass.

The beyerdynamic DT 990 Premium Edition headphones deliver open-back, high-impedance (250 Ohm) audio with exceptional clarity and bass depth. Crafted from premium aluminium and designed for comfort, these wired headphones connect via a detachable 3.5mm cable to a wide range of devices, making them ideal for home, office, and personal listening. Made in Germany, they promise durability and top-tier sound quality favored by discerning pop and rock enthusiasts.

Specifications

Connectivity technology	Wired
Wireless communication technology	Bluetooth
Included components	DT 990 Premium Edition Hi-Fi Headphones, Manual, Warranty Booklet
Age range (description)	Adult
Material	Aluminium
Specific uses for product	Home, Office
Recommended uses for product	Indoor Personal Listening
Compatible devices	Laptops, Desktops, Tablets, Cellphones, Music Production Equipment, Gaming Consoles, Smart Speakers, Television, Car Audio Systems
Control type	Media Control
Cable feature	Detachable
Item weight	290 Grams
Water resistance level	Not Water Resistant
Package type	Standard Packaging
Unit count	1.0 count
Style	250 Ohm
Control method	Touch
Number of items	1
Product Dimensions	17.78 x 10.16 x 21.59 cm; 290 g
Item model number	beyerdynamic
Connector	3.5mm Jack
Hardware Interface	3.5mm Audio
Material Type	Aluminium
Size	17.8 x 10.2 x 21.6 cm
Colour Screen	No
Speaker Diameter	7 inches
Item Weight	290 g

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