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 DT 990 Edition 600 Ohm Open-Back Stereo Hi-Fi Headphones

beyerdynamic DT 990 Edition 600 Ohm Open-Back Stereo Hi-Fi Headphones

Product ID: 49915424

Details

Brand
beyerdynamic
Colour
Silver
Ear placement
Over Ear
Form factor
Over Ear
Frequency response
23000 Hz
Headphone jack
3.5 mm Jack

🎧600 Ohm impedance for audiophile-grade clarity

🎼5 Hz - 35 kHz frequency range for ultra-wide sound spectrum

🛠️Made in Germany with durable, replaceable parts

Description

🎧 Elevate your sound game — don’t just listen, experience every note!

BUILT TO LAST - Crafted in Germany with high-quality materials and easily replaceable parts for unmatched durability and longevity.
ALL DAY COMFORT - Premium breathable velour ear pads and lightweight aluminum frame ensure fatigue-free listening for hours.
VERSATILE COMPATIBILITY - Optimized for powerful headphone outputs and amplifiers, perfect for laptops, smart speakers, and studio setups.
SPACIOUS OPEN BACK DESIGN - Feel the music breathe with an open acoustic design that delivers a natural, speaker-like soundstage.
AUDIOPHILE PRECISION SOUND - Experience crystal-clear highs and deep, punchy bass that bring your favorite rock and pop tracks to life.

The beyerdynamic DT 990 Edition 600 Ohm headphones are open-back, over-ear headphones designed for audiophiles and professionals seeking exceptional sound quality. With a wide frequency response from 5 Hz to 35 kHz and a high impedance of 600 Ohms, they deliver detailed highs and rich bass. Made in Germany with premium materials and replaceable parts, these headphones offer superior comfort and durability, ideal for extended listening sessions and use with high-powered amplifiers.

Specifications

ASIN	B0024NK34O
Age Range Description	Adult
Antenna Location	Hi-Fi Music
Audio Driver Type	Dynamic Driver
Best Sellers Rank	7,285 in Headphones & Earphones
Box Contents	3m Retractable Cable
Brand	beyerdynamic
Brand Name	beyerdynamic
Cable Features	Retractable
Carrying Case Color	Silver
Carrying Case Material	fabric or leather
Colour	Silver
Compatible Devices	Laptops, Smart Speakers, Game Consoles, TVs, Phones, Desktop-PCs
Control Method	Remote
Control Type	Volume Control
Customer Package Type	Cushioned
Customer Reviews	4.4 out of 5 stars 701 Reviews
EU Spare Part Availability Duration	2 Years
Ear placement	Over Ear
Earpiece Shape	over-ear
Enclosure Material	Plastic
Form factor	Over Ear
Frequency Range	20 - 23,000 Hz
Frequency Response	23000 Hz
Headphone Form Factor	Over Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	600 Ohms
Is Autographed	No
Item Weight	762 g
Manufacturer	beyerdynamic
Model Name	DT 990 Premium - 600 Ohm Gray
Model Number	beyerdynamic
Network Connectivity Technology	Wired
Noise Control	None
Noise control	None
Number of Items	1
Product Features	High fidelity
Product Warranty	2 Years
Sensitivity	96 dB
Series Number	483966
Specific Uses For Product	Listening to music
Style Name	600 Ohm
Subject Character	Thor
Theme	Video Game
Unit Count	1.0 count
Water Resistance Level	Not Water Resistant
Wireless Technology Type	Bluetooth

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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