0ur opinion: :The foldable PXC 300 headphones with NoiseGard Advance active noise canceling technology let you enjoy music even in noisy environments. They reduce unwanted noise by up to 80% and the optimized circuit technology ensures reduced susceptibility to mobile phone interference. The PXC 300 is supplied complete with a protective soft case, batteries and aircraft audio adaptors.
:Travel in comfort and tune out the noise around you with the Sennheiser PXC 300 folding headset. The 3.5 mm double mono jack is compatible with most personal audio devices; the set also includes a 6.3 mm stereo jack for use with airline audio systems. The 1.6 m copper cable is reinforced with Kevlar for solid durability.
Fold-and-flip headphones are designed for comfort--the ergonomic headband offers two-point suspension and soft ear cups, and can be adjusted to a variety of positions. The switchable NoiseGard active noise compensation attenuates frequencies below 1,000 Hz by up to -15 dB, so you'll be able to tune in to your music and tune out the conversation around you. A padded carrying case accommodates the headphones, cable and adapter, and the manufacturer provides a two-year warranty covering parts and service.
What's in the Box:Headset, 1/4 inch (6.3 mm) stereo jack, 3.5 mm double mono jack, soft carrying case, batteries, user's guide, warranty and registration card
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Pleased with Results and $$Value ...
I purchased these for my recent transatlantic flight. I did alot of research, because I did not want to spring for the Bose, also, too many comments about the Bose headpiece cracking after several wearings. So, I decided on the Sennheiser 300, which were also recommended by a friend. They come in a nice little case, and they fold up, doesn't take too much to get the hang of folding them. I was also happy because they have a two prong adapter which was necessary for my flight. They cancelled out all of the plane's swooshing noises, which give me terrible headaches. You arrive much more rested, IMHO. They don't cancel out ALL noise, such as the screaming baby, but do minimize these disturbances. Very comfortable to wear. I think these are the best in this price range, and they are sturdily constructed.
Buyer's feedback: 
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Excellent Noise Reduction Headphones for Travel
The best thing about the headphones are thier size and packability. They fold into a small space, fit nicely into the supplied case, and fit easily into my crampt brief case. The sound is excellent (second only to the more costly and bulky Bose), and the noise reduction is great. As with all sit on your ear headphones, they do make you want to take them off after a several hours of use. My wishes for improvements: A coiled cord that would make it easier to keep from tangeling; an adjustable volume on the cord; a cord that you could unplug from the headphone and replace, if needed. I predict it is only a matter of time before the cord gets pinched or damaged in some way and then...goodbye nice headphones. However, after much research, I found these to be the best NR headphones available for the frequent traveler, with limited space in the carry on.
Buyer's feedback: 
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* Great Sound but Fragile ...
I purchased two headphones for a long international flight for my wife and me. The headphones performed beautifully and the noise cancelling feature was a god send. However, with the smaller seat space on today's airlines, the cord was often bent over 90 degrees out of the connector. One of the sets'wire apparently broke and only one channel would work. It's within current technology to design a harness that would take repeated bending and stress. One of my headphones is now back for repair.
Buyer's feedback: 
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Good But Not Great
Sennheiser PXC 300 Noise Cancelling Headphones
Overall audio quality is good. Very good mid range and highs, average in low range. Headphones can be used without noise cancelling function turned on (a nice feature) but the overall audio quality is noticeably better with the function turned on. When plugged into an iPod, requires high volume setting but this does not seem to cause any problem for either iPod or headphones. Noise cancelling capability is acceptable for the price. Headset and ear cushions are very comfortable for long duration use. Separate battery case is somewhat awkward and inconvenient. Overall, given the price, this product provides good performance and is recommended.
Buyer's feedback: 
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* Compact & Great ...
These headphones are perfect for the traveler who wants a very goid noise reduction headset and a compact format. These headphones work great and can fit in the smallest of carry-ons. I highly recommend theme for the price.