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My choice: The Sennheiser HD1 Wireless (Bluetooth + NoiseGard ) Over Ear Headphnones. Used to be sold as Momentum 2.0 Wireless Over Ear, but trademark issues related to the ownership of the "Momentum" name are the reason behind the name change, at least in North America. The headphones are exactly the same as the previously released Momentums. The headphones are bluetooth 4.0, are aptX compatible, have NoiseGard noise canceller, have integrated VoiceMax microphones used by the NoiseGard system and also used for phone conversations. They come in two colors: black and Ivory, with stainless and leather parts. 499.95$ USD or 649.95$ CAD MSRP. Also included is a removeable 1.4M cable (4ft) for when your prefer not to use the bluetooth system. Headphones are foldable and come with a small pouch made of tissue, and a second pouch: a hard case that also includes an USB cable used for charging and an airplane input adapter. Automatic (variable) Noise Gard system using 4 pick-up microphones has a 25db maximum attenuation. The 600mAh lithium polymer rechargeable battery has a 22h operating time and a 3h recharging time. The headphones are using a closed over ear design. Impedance is 28ohms (passive) or 480ohms (active). The sound is great, balanced, slightly bass enhanced, but not intruding the mids. Highs are good and rather soft, not sibilant, better in that respect than the Bose QC35 or Sennheiser PXC550. Headphones are comfortable, but the leather over ear design can become hot and humid if used in high temperature (outside) conditions. Otherwise, they are probably the best wireless bluetooth headphones with noise canceller on the market, competing with the Bose QC35 and Sennheiser PXC550. In one sentence, I would say that the HD1 wireless over ear (Momentums) are slightly better sounding, better balanced, more euphonic than the Bose QC35 and Sennheiser PXC550, and the Bose have a slightly more effective noise canceller (more db attenuation) than both Sennheisers, but at the expense of slightly more intruding in its sound quality). The PXC550 are also very good, but the mids and highs don't compete with the HD1 wireless (they are also less expensive). The PXC550 are very light and more compact, maybe better suited for travel than the HD1. That said, all three headphones are worth considering and both the HD1 and QC35 truly compete for the title of best wireless bluetooth noise cancelling headphones on the market.
Would vote for nothing two times if I could.