Question 1

Will everyones ears fit into these? I like Astro

Accepted Answer

My family stood side-by-side, ear-to-ear so we could all listen, but the headphones were too small to Fit “everyone’s ears into these”...plus my daughters ears get pretty waxy so the sound quality playing out of her ear hole would have been muffled.

Question 2

What is the difference between the 250 ohm and 32 ohm models?

Accepted Answer

The Ohm is the unit of electrical impedance. It's a measure of how difficult it is for current to flow through the conductor. A conductor with a higher impedance will require a higher voltage to push an equivalent current level through it than one with a lower impedance. A 10-volt source can drive 40 milliamps (.04 amps) through a 250 Ohm impedance, but you only need a 1.5V battery to push 47 milliamps through a 32 ohm impedance. This is why 32 Ohm headphones are recommended for portable equipment (phones, etc), where low-voltage battery sources are common.

A 600 Ohm headphone is more appropriate for studio work, where the amplifier driving them often uses +/- 15 volts (a 30 volt swing).  A 250 ohm headphone is one that attempts to bridge both worlds - low enough to be used with battery powered sources, but "stiff" enough (electrically) to take advantage of the benefits that a big voltage swing provides, such as a higher s/n ratio.

A lower impedance headphone (everything else being equal) does NOT require less power to use. In fact, it requires slightly more. But you do not want to use a 600 ohm set of headphones (in general) with a low-voltage amp such as one the one in your phone or laptop. Generally, they will not play as loudly, as they will require more current than the amplifier can provide into the higher impedance.

Question 3

Do these headphones have a removable cable?

Accepted Answer

I have the dt 990 pro 250 ohms, and no they do not have a removal cable.

Question 4

Will these completely encase the ear? I can't stand headphones that put the cushion on the ear instead of around it completely, only touching the head

Accepted Answer

As long as your head is not very large, it can wrap your ears. if you want choice 250Ω or 600Ω before you need Bought a Amp。

ASIN	B07DHXBMJD
Age Range Description	Adult
Antenna Location	Music
Audio Driver Type	Dynamic Driver
Box Contents	1/4" to 3.55mm Gold plated Adapter, Protective Case, beyerdynamic DT 990 Premium - 250 OHM Black Edition
Brand Name	beyerdynamic
Cable Features	Detachable
Colour	Black
Compatible Devices	Music Production Equipment, Laptops, Desktops, Tablets, Cellphones, Car Audio Systems
Control Method	Remote
Control Type	Noise Control
Customer Package Type	Standard Packaging
Customer Reviews	4.6 4.6 out of 5 stars (156)
Earpiece Shape	Over Ear
Enclosure Material	Plastic
Frequency Range	5 Hz - 35 kHz
Global Trade Identification Number	04010118717888
Headphone Form Factor	Over Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	250 Ohms
Is Autographed	No
Item Type Name	Stereo Headphones
Item Weight	1.6 Pounds
Manufacturer	beyerdynamic
Model Name	DT 990 Premium
Model Number	717886
Network Connectivity Technology	Wired
Noise Control	None
Number of Items	1
Product Features	Lightweight, Noise Isolation, Tangle Free Cord
Series Number	717886
Specific Uses For Product	Music
Style Name	DT 990 Black Special Edition, 250 Ohm
Theme	Music
Unit Count	1.0 count
Water Resistance Level	Not Water Resistant

Beyerdynamic DT 990 Premium Open-Back Over-Ear Hi-Fi Stereo Headphones

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