Sennheiser Consumer Audio BTD 600 Bluetooth® Dongle - USB-A/USB-C Adapter with AptX Audio Codecs for Stable, Sound - Listen to Music, Make Calls, and Watch Videos

Update: Since I posted this review, the BTD-600 had a firmware update that has completely overhauled the device and improved the audio quality in major ways.For starters, the most recent firmware update claims to add support for the sample rate, 96khz. I say claims to because that's not what my Qudelix-5K Bluetooth DAC is reporting, and even before this update, Windows let you select 96khz. I suspect even if it did support 96khz, the Qudelix would not be able to receive it at that rate. It uses the QCC5124 chip, and if you look up the features, the chip doesn't seem to support 96khz. The first mention of 96khz audio came with Bluetooth 5.2. With the BTD-600 being a Bluetooth 5.2 adapter, it would make sense for it to support 96khz, but I don't have a device capable of testing it. For the record, it seems that chips that support AptX Lossless use Bluetooth 5.3, so I doubt this adapter will ever receive an update adding AptX Lossless.While I can't say whether it's actually transmitting 96khz, I can say that the 280kbps limit has been lifted. On my Qudelix-5K, I'm able to receive audio generally from 350kbps up to a maximum 430kbps, and the difference in audio quality is significant. Before, the audio quality was noticeably compressed. Not terrible, and the benefits to latency make up for those shortcomings, but also not great. Now, to my ears, it's functionally perfect, and the best part about it is that it does this without affecting latency. It still seems to deliver 80ms of latency, just with significantly better audio quality. This is very different from adapters that have separate low latency and quality modes, like the Creative BT-W5, which seems to at least double the amount of latency when in quality mode, and limits the audio quality in low latency mode, similarly to how this adapter used to work, and that adapter is 25% more expensive than this one, and in terms of its implementation of AptX Adaptive, it's just worse.For this reason, this is an exceptional adapter for movies and games, which, in my opinion, is the big draw of AptX Adaptive. If you just want high quality for music, AptX and AptX HD are open source now. On Windows, you can buy Alternative A2DP for $5 and get high audio quality, without needing separate hardware, and I'd expect more devices to start supporting AptX and AptX HD by default from now on, but high audio quality and low latency is something you can only get from AptX Adaptive, and even other, more expensive products aren't able to deliver what this adapter does.That being said, it's not completely perfect. I noticed some stutter. It's pretty bad when you first connect your device. Over time it becomes more stable, but brief instance of stutter still happens occasionally. Signal strength is far more important now than before, probably because it's not hard to keep a 280kbps audio stream stable, so you're going to want to keep a clear path between your headphones and the adapter, and try to keep distance as low as possible. Maybe this is improved with a Bluetooth 5.2 receiver/headphones, but I can't speak for that.

I can't believe the difference in sound quality! It works perfectly. Be sure to read the quick start guide because it's a little tricky to setup. Apple users...you need to know that you will no longer be using the internal Bluetooth, you will now be using the adapter. You actually pair your headphones to the adapter. Also, be certain to download the Momentum 4 app on your iPhone. There, you can see if you are now using aptX, which is necessary to transmit the music in High Resolution. If the CODEC doesn't say aptX, you are not getting the highest quality sound. Keep trying.

Works great to bypass apple products limited Bluetooth transmission for much clearer sound quality. Will not work with iPhone unless phone is also being charge due to power withdrawal limits of those devices. Works with iPad and laptops well and easy to connect.

my work lap top has a crappy blue tooth receiver in it, would not stay connected to my Bose head phones and when connected was crackly. Used the cord for a while but hate cords. Found this and it works like a charm. connects to my headphones crystal clear audio and no issue. stays plugged into my work laptop 100% of the time. With fact my headphones can connect to 2 devices at once. I can hear my alerts from computer as well as listen to music from phone.

I use this adapter with a pair of Momentum 4's and they reduce latency enough to not really notice issues with movies or games. They do improve the sound a bit, but it's hard to tell.The only issue I've ran into is when using multipoint between PC and laptop. If I'm on a call with the laptop, the PC connection will periodically disconnect and reconnect. This is fine when I'm on a call but the notifications in the headphones are very distracting. You can disable them using the phone app.

This thing is absolutely unusable. I bought to use with a pair of Sennheiser earbuds and assumed it would function together really well. It does not. When they *do* manage to connect to the dongle, the sound blips in for a millisecond and then out for a few seconds and then back in and out and in. It is literally useless.

This dongle is absolutely fantastic......when it works. If you have a Sennheiser headset, this will work with them. At first, the connectivity is really good but then there will be times where it will disconnect. To fix that, you would have to either turn off, then turn on the headset, OR unplug the dongle and plug it back in. I used this to have my headset wireless while being able to use my GoXLR while gaming, or streaming. It became an annoyance when it would disconnect during my gaming sessions or just simply listening to music. Even though I do think the price is a little on the high end for this issue, it does work really well, when it actually works if that makes sense. Even when there are other reviews saying the same thing I always get a product to try it for myself and I had it for a month and a half to give it a shot for the Christmas time since there is a longer return policy. Numerous times it has disconnected and I had to return it. The lag is very minimal, and the sound quality is still good. The dongle is a small size so you would be just fine that it won't take up much room in the back of your PC or wherever you plan on using it. Use at your own risk, however in my opinion with the connectivity issues that myself and others are saying, I don't think it's worth it. I ended up going wired connection instead.