Roland RH-50

These are a pair of noise-canceling headphones from Roland. These headphones cancel all external noise. They do this is with a tiny microphone on the outside of the headphones, which records the sounds that are heard, and then plays them back at a 180 degree angle, which effectively cancels the noise out due to phasing. This really only works with noises that are constant, such as wind, traffic, airplane turbines, and fans/AC. A car horn isn't going to get canceled out, for instance.
When these headphones have the noise canceling turned on, they sound pretty great. They have a pretty solid bass response for headphones of their size, a response that I was very impressed with. The frequencies are well-rounded. However, when the headphones run out of battery power, which can be often if you aren't careful, they don't sound nearly as good. In fact, they are pretty weak at that point. Definitely make it a point to always have the batteries in and as fresh as possible. This can eventually rack up quite an expense in terms of batteries.
They are not really ideal for studio use, as they aren't exactly equipped to handle the un mastered, rough tracks that come through a DAW. They also aren't capable of providing isolation when there's other instruments going on, so they really aren't that effective in this capacity.
The biggest complaint I've had with these headphones is that they break easily. They have a cool collapsible structure that makes them fit in small places, unfortunately the plastic isn't hard enough to withstand much pressure at all. Be very careful with them or you'll regret it.
While these are a decent price, and do sound good when everything is going swimmingly, there's a lot of problems with them. Enjoy at your own risk and be very very careful with them, they aren’t cheap enough to keep replacing.

This is a budget headphone, so I understand he does not take the comparison with high-end headphones (DT 880 that I use), but compared to other headphones of this price range it is also very below (I also use a Beyer DT 231, although a little more expensive but it's day and night).

It is so bad that I would be ashamed to sell it and I keep it.

Avoid.

I bought these headphones for home studio use, at the time not too budget, a salesman told me that infamous shit.

The headphone has pretty well, I have for several years and it has not suffered too much, good most of the time it is stored at the bottom of a box.

Okay let's get to what really interests us: the sound.

And then, well, what if it is only this headphone is bad, I can not understand that Roland had dared let put his name on this crap, nothing is returned, the highs are atrocious down is unclear.

- How long have you use it?
In recent years

- What is the particular feature you like best and least?
Firm on the head. The sound come away well, even if a dire need for bass and one finds that a lot of treble which I find quite garish.

- Have you tried many other models before acqurir?
In this price range, I have to say no. I reu bundled with my battery-mail.

- How do you report qualitprix?
I think he means. For even if a is only 30, there are many default.

- With the exprience, you do again this choice?
With a budget can be tightened trs. But I think it is better to pay a little more for a product more acceptable.