EAS Brooklyn Labs, Version 2 Bluetooth Wireless Adapter and Amplifier, for Audio-Technica M50x Professional Studio Headphones, Clear, Aptx, Long Battery

I've been using this every other day and it sounds just fine! I suppose there might be a little difference between this and the headphone cable for audio quality, but not enough to really notice. There are dropouts if I put my phone in my right pocket instead of my left, but all Bluetooth headphones do that for me. Totally worth it, and if you love music and have a pair of these headphones, you will love being able to use them without the cable.

Nothing but mono audio for me. I've been going through my control panel settings for 2 laptops, a tablet, and my smartphone. I cannot get the adapter to transmit in stereo on any of them. The adapter doesn't show has having configurable setting to change it to stereo in windows.

directions lacking details. thought my unit was broken but i had to push the unit in until i felt it pop into place then it works great with decent battery life. lasts all day at work and i can plug it in overnight to have a full charge for the following day(might buy a second one to have a backup always fully charged.. the sliding power switch feels like it may break. not sure how it will affect my cables from locking in. since i have to push until it pops in i'm worried it might be wearing away the locking nubs.

I love the ATH-M50x and this adds to the versatility of those headphones which is awesome. They make a good solid connection and fit in well with the style. This is the main reason I'm not giving it a one-star review. I'm being generous rounding up to 3 stars. This is really two separate things: 1. a decent bluetooth headphone conversion kit - 2. A failed attempt at a bluetooth headsetI'll start with the PROs:- Looks good- Snug fit, but easy to remove (unlike the first version which you had to nearly destroy to remove)- Very good stereo audio quality ****(this is a heavily qualified statement as you'll see later)- No hassle syncing- Reasonable button placementCONs:- Nearly useless on a PC- High quality audio disappears when using the mic- They removed the boom mic option!!!! WTF (built-in mic only)- Mic volume is very low and can't be adjusted- Audio 'glitches' happen more frequently as you get further awayFor context, I wanted to use this to make calls on Google Voice while listening to game audio and music. For that purpose this fails completely. I cannot blame this entirely on the product because this may be a fundamental limitation of Bluetooth; it is definitely partly due to PC drivers not being optimized. I discovered that I got much better performance on Android than on Windows or Linux. That being said, since I wanted to use this on a PC I'm still going to discuss why that is a horrible idea.I've attached two screenshots from an audio visualization; these aren't very scientific since they don't show decibels or Hz. It's just a spectrogram visualization from foobar2000, but it gives a good depiction of frequency response over time. The lack of precision just goes to show you how obvious it is. Both images show the results of the same sine sweep played via my laptop to the adapter connected to my ATH-M50x and recorded using a stereo field recorder. There's a lot of low frequency background noise this room, so the low end is hard to see. What's obvious is that when you use the microphone there's only about half of the sweep being recorded at all. Everything above a certain frequency is just. gone. To make matters worse there is ghosting of higher frequencies in the lower registry. Long, technical story short: listening to music in this mode is no better than the elevator music being played on hold on a phone from the 1990s. It. is. painfully terrible.Voice calls (for you anyway) themselves are not bad. It's obviously using the frequencies needed for cell phone conversations. When I switch over to Android it even takes at least some advantage of the "HD calling" feature as I can hear higher frequencies during those calls. However, Android does not let you mix multiple audio sources, so listening to music during a call is out of the question. The big problem with using this as a headset on your cell phone is that the microphone is too low. I haven't recorded any test sounds from this, but everyone I spoke with while using them said that I was very quite / distant or couldn't understand me at all until I switched to the phone mic.That means that the only thing these are good for is bluetooth headphones. And while the audio quality is very good when conditions are good, it's not nearly as good at wired. That cuts down the situations where I would want to use large headphones to get less than pure audio quality. There is also periodic glitches or pops/clicks, especially when playing from the computer (both in Windows and Linux). It's much less sever in android.So, this works well watching movies, listening to podcasts, playing games on your phone, or listening to music that doesn't need a lot of low end bass response. That's not a complete list, but it's useful enough that I'm on the fence about returning this (second generation) product. I would not buy it again as I can buy a stand alone bluetooth headset for about the same price that will accomplish the same goals. The ATH-M50x's are quite comfortable though and there's not a lot of options for Bluetooth conversion.

Build quality is great, it was easy to install into the headphones and again it was simple to pair with all my bluetooth devices. The sound quality is pretty good also , while i don't think it beats directly plugging in the headphones to the device you want to use. The ease of wireless headphones is a decent trade off. Battery life is good too. So yeah i would say give these a try if you want to convert you m50x into bluetooth headphones.

I love my M50X headphones and this product brought it to a whole new level. Making the headphones Bluetooth with a sleek design and easy connectivity, I will probably never use a cord for these headphones again. I’ve only had the product for a little over a day so I can’t speak to the battery life quite yet, but the sound quality is exactly what you get from the wire.Edit:Connection is a little sketchy from ear to pocket. Not terrible and still works just began noticing connection problems at this distance. Be warned

The range for Bluetooth is about 20 inches or 50cm. This is unbelievable. Ideally I would be able to keep my cell phone in my pocket, not in my left hand adjacent to the Brooklyn Labs wireless unit. The reciever/amplifier is a great idea, and I love my Audia Technica headphones, I just wish it had adequate range.2 month update: the unit no longer turns on. It charges fine, and works while it is plugged into the charger, but when disconnected it does not turn on. Too bad, because it has never been dropped or abused... unless you consider mixing Wu-tang with the Beatles headphone abuse!

Only four star on sound quality because anything besides a hardline connection you're not getting the best sound quality. Love the freedom this gives me when wearing my headphones, totally worth the purchase price.