Question 1

How does this compare to the Audio Technica M50x?

Accepted Answer

AS an audio engineer I can share with you these are two different headphones and I believe their respective sound strengths and weaknesses reflect their nature.  Without getting into the techno babble, I will simplify this in the following manner:  The Audio Technica M50x is a general headset which is good for listening to music and due its build design very good/great for gaming.  The Beyerdynamic DT 770 PRO is great for audio production and more detailed listening for music and good/very good for gaming.  If you are looking for a gaming headset, you can't go wrong with either, if you are looking to listen to music and want a more detailed sound or if you using them for audio production then the Beyerdynamic DT 770 PRO should be your choice.

Question 2

Does the 30 ohms have the same bass output if it is connected to an amp compare with the 250 ohms?

Accepted Answer

I am looking at this 250 ohm headphone because it has a high impedance. I build a vacuum tube amplifier with a nominal impedance of 600 ohms. Although it seems to drive 32 ohm headphones, it will work better with headphones closer to 600. The high voltage changes needed to drive high impedance headphones do not carry a lot of current, but they do carry much detail. I tend to believe that high impedance headphones will be more responsive and defined than lower impedance headphones, but their hardware requirements are different.

Small mobile devices don't have high voltages in them to generate signals for high impedance headphones, which is why low impedance is standardized, and even then, many devices lack the power to drive the bass on them. A dedicated amp is the extra hardware to fill out a quality signal. So even poor quality headphones can sound better when driven by the appropriate source.

In the end, your headphones will not improve the sound significantly if you do not have an amplifier to back them up, though I still think higher impedance phones will result in a better sound.

Question 3

Given the prices $180 for 32 ohms, $278 for 80 ohms, and $170 for 250 ohms, which one should I buy for 98% amp-less listening?

Accepted Answer

For an amp-less setup the 32 Ohm are the way to go.  Yes you can use the 80 Ohms non-amp'd (the 250s are not recommended for this), but your listening levels are going to be limited (how many dB you get out of them).
Beyerdynamic created a set of low-impedance for a reason - and if your laptop / phone / or PC with no external amp/dac or amp'd internal card are your primary use...then you have your answer.

Question 4

Anyone know where these are made?  Are they made in China like many competitor's models?

Accepted Answer

Products are made in Germany. Beware of counterfeiter units shipping from China at reduced price and NO warranty.

ASIN	B0016MNAAI
Age Range Description	Adult
Antenna Location	Recording
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#32,862 in Electronics ( See Top 100 in Electronics ) #171 in Over-Ear Headphones
Box Contents	Headphone, Drawstring Bag
Brand	beyerdynamic
Brand Name	beyerdynamic
Cable Features	Tangle Free
Carrying Case Weight	0.1 Pounds
Colour	BLACK
Compatible Devices	Car Audio Systems, Desktops, Laptops, Smart Speaker, Television
Control Method	Remote
Control Type	Volume Control
Country of Origin	Germany
Customer Package Type	Standard Packaging
Customer Reviews	4.6 out of 5 stars 15,714 Reviews
Ear Placement	Over Ear
Earpiece Shape	Circle
Enclosure Material	Plastic
Form Factor	Over Ear
Frequency Range	5 Hz - 35,000 Hz
Global Trade Identification Number	04010118474743
Headphone Form Factor	Over Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	Over Ear
Impedance	80 Ohms
Impedance Unit of Measure	80 Ohms
Importer Contact Information	beyerdynamic India Private Limited #1, 14th Cross, 10th Main, Malleswaram, Bangalore - 560003, Contact +91-80-23310101
Is Autographed	No
Is Electric	No
Item Type Name	Headphone
Item Weight Unit of Measure	9.52 Ounces
Manufacturer	Manufactured by:-"beyerdynamic Gmbh & Co. KG"Theresienstr 8, D-74072 Heilbronn - Germany, beyerdynamic GmbH & Co. KG Postfach 1320 D-74003 Heilbronn, Germany Tel : +49 7131 617324
Manufacturer Contact Information	beyerdynamic GmbH & Co. KG Postfach 1320 D-74003 Heilbronn, Germany Tel : +49 7131 617324
Model Name	DT 770 PRO 80 Ω
Model Number	1000640
Network Connectivity Technology	Wired
Noise Control	None
Number of Items	1
Packer Contact Information	beyerdynamic GmbH & Co. KG Postfach 1320 D-74003 Heilbronn, Germany Tel : +49 7131 617322
Product Features	Studio headphones, closed systems, straight single sided cable 3 m (9.8 ft.) with stereo mini-jack / 1/4" adapter
Series Number	474746
Specific Uses For Product	Professional
Style Name	Headphones
Theme	Music
Unit Count	50 Piece
Warranty Description	2 year manufacturer
Water Resistance Level	Not Water Resistant
Wireless Technology Type	3.5 mm

beyerdynamic DT 770 PRO 80 Ω Studio Headphones, Closed Systems,

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