Question 1

Truly good for monitoring with a flat response?  In other words, not ideal for consumer music listening?

Accepted Answer

I'm a DJ and producer and I guarantee it is an excellent headphone, very good for both studio monitoring and also to use in events, its smothering and impecable is a very comfortable phone

Question 2

This are the same as the sennheiser hd25-1 ii?

Accepted Answer

You can go opt the HD-25 or HD-25 Plus to get the same product as the HD-25 1-II with many updates.

Question 3

What materials are the ear cushions made of? Are both pairs the same?

Accepted Answer

I certainly hope they have the velour that you swap on. I love the velour. Yes, for just a few weeks they hurt while breaking in, but only for a very short time when they are brand new. They have a break-in period, so your ears hurt if you have them on for hours when they are new. And then they mould to your ears, and they are the MOST comfortable. For YEARS of heavy, heavy wear. I bought mine in 2011. It is now 2017. And I have accidentally:  sat on them, stepped on them, got them stuck in the metal parts of a recliner chair! They have been accidentally crushed under heavy books, sweat-soaked during exercise, and almost anything else you can probably imagine. Almost every day something dire would happen because I used them for hours and hours and hours. And 6 years is a very long time!! I may get the protective case, because I would have gotten more years from them! These are the best and most durable, and that's not just my opinion. And there is no phony bass. If you want to change that, there are easy ways to get add-on bass. The mid-range is beyond awesome. Anyone who lives and works with music should have a pair of these. And if you treat them more kindly than I did, they will outlive your new puppy! They are STRONG. In every way.

Question 4

What's the difference between these and the  sennheiser hd 25-1 ii that these replace?

Accepted Answer

Newly designed headband ends ensure that the earcups lock securely into place, while lightweight aluminum voice coils ensure an excellent transient response. With a frequency response of 16 to 22,000Hz, an impedance of 70 ohms and a maximum SPL of 120dB, the HD 25 lends itself to any monitoring task, whether broadcasting, live recording or in the DJ booth. The HD 25 comes complete with a screw-on jack adaptor to 1/4" inch (6.3mm) for its straight steel cable.

ASIN	B01CRI3UOU
Additional Features	Lightweight
Age Range Description	Adult
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#830 in Musical Instruments ( See Top 100 in Musical Instruments ) #5 in DJ Headphones
Brand	Sennheiser
Brand Name	Sennheiser
Built-In Media	1 HD 25\|1 Screw on jack adapter 3.5 to 6.3 mm\|HD 25 Plus only: 1 Pouch\|HD 25 Plus only: 1 additional pair of soft earpads\|HD 25 Plus only: 1 additional 1.5m-3m straight cable
Cable Features	Detachable
Carrying Case Color	Black
Carrying Case Material	a combination of padded fabric and durable synthetic material
Color	Black
Compatible Devices	Devices with 3.5 mm audio input
Connectivity Technology	Wired
Control Method	Touch
Control Type	Volume Control
Customer Reviews	4.6 out of 5 stars 2,742 Reviews
Ear Placement	On Ear
Earpiece Shape	Rounded, Supra-Aural, Closed-Back
Enclosure Material	Plastic
Form Factor	On Ear
Frequency Response	22000 hertz
Generation	25
Global Trade Identification Number	00615104272965
Hardware Interface	3.5mm Audio
Headphone Folding Features	On Ear
Headphone Jack	3.5 mm Jack
Headphones Ear Placement	On Ear
Impedance	70 ohm
Input-Device Interface	3.5 mm Jack
Item Highlight	Closed-back design with detachable cable and jack adapter for DJing, studio monitoring and sound reinforcement
Item Type Name	Sennheiser HD 25 Professional DJ Headphone
Item Weight	140 g
Manufacturer	Sennheiser
Mfr Part Number	HD25
Model Name	HD25
Model Number	506909
Noise Control	Sound Isolation
Noise Control Features	passive_noise_reduction
Number of Items	1
Number of Packs	1
Sensitivity	120 db
Specific Uses For Product	Multi-Purpose
Style Name	HD 25
UPC	615104272965
Unit Count	1 Count
Warranty Description	2 years.
Water Resistance Level	Not Water Resistant

Sennheiser Pro Audio Professional HD 25 On-Ear DJ Headphones Black

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