Summary: Sennheiser have dropped the ball with these headphones.If you what to connect to the headphone using Bluetooth the built-in amp just doesn't have enough power to power drivers! so operate at half their potential. If you what these headphones to come alive you'll need to connect them with the supplied cable to a computer or an amp that can drive them properly. And don't bother with Noisegard!
At the price paid, they were value, but maybe not quite living up to the top-of-the-range billing you expected from Sennheiser
B. Knapp "Bazzoid/Sazzles", Amazon
29 March 2015
Summary: When i saw these half price I decided to go for them. They still seem overpriced to me tbh, but at half price I can live with that. The noise cancellation is OK, but being active I think it needs louder noises than hums and rumbles. I was disappointed in the volume tbh and the manuals are not the most helpful, one of these diagrams only attempts.
Summary: I generally don't give such a small score to anything but this product is exception. It costed me so much so I had high hopes with it. My detailed observation is as follows : 1) Noise Cancellation - it's not worth at all. I used Parrot Zik and you cannot hear anything outside noise/sound. Sennheiser lets you listen everything irrespective you use Noise Cancellation or not.
Summary: Not really noise cancelling and even less 'portable' as the only reliable thing about them is their breakage rate when removed from a room. I have tried to get on with these headphones as I have many other Sennheiser products. My back-up 'phones are Zik, but their delay makes them almost unusable. I'm looking at cheaper 'phones, such as Sony now. Verdict: Reasonable but heavily overpriced. PS. I also have 3 MM550X batteries about to go on ebay.
Summary: Desperately wanted just a little bit more volume on these. Found myself almost in tears having debated for ages about headphones and finally got these. The volume isn't there and all I want is goosebumps. Give me goosebumps! I can't get them with this volume. Even at full blast, it's at at about 6.5/10 for me. I work in radio, so I have a lot of respect for sound quality and the sound seems fine.