Reddit mentions of Avantree Oasis Long Range Bluetooth Transmitter Receiver for TV & PC, aptX Low Latency Wireless Audio Adapter for Headphones, Home Stereo, Dual Link, Voice Guide, Touch Screen, Optical AUX RCA

Taken audio straight from Tv, so no sync issues.

https://www.amazon.com/Avantree-Bluetooth-Transmitter-Receiver-Speakers/dp/B01H6I3YGK/ref=sr_1_8?ie=UTF8&qid=1496624732&sr=8-8&keywords=bluetooth+audio+transmitter

Any of these should work:

Giveet bluetooth adapter

TaoTronics bluetooth adapter

Avantree long range bluetooth adapter

Some websites rate this as the best transmitter because of its low latency, but I have not tried it! https://www.amazon.com/Avantree-Bluetooth-Transmitter-Receiver-Speakers/dp/B01H6I3YGK/ref=sr_1_2?s=electronics&ie=UTF8&qid=1504726148&sr=1-2-spons&keywords=bluetooth+transmitter&psc=1

What you’re looking for is a Bluetooth transmitter. I did find this one on Amazon (Avantree Long Range Bluetooth Transmitter) that has an 3.5mm aux in, so it can be connected using an aux cord from your reciever’s headphone jack (and also to power source.)

Even if you don’t get this one specifically, maybe it can help you identify another similar product that works best for you. (for example, The Avantree one can also function as a Bluetooth receiver, which it sounds like your current setup doesn’t need.)

This is a simpler/cheaper option from a brand I have positive experience with.

I understand why you would want to listen to music in headphones but why bother with vinyl? Your analog signal will be converted to digital anyways on it's way to the headphones so you might as well just use a computer, iphone, etc. If you just want to use headphones there are lots of great, inexpensive wired models to choose from.

But, if you must stubbornly listen to records through bluetooth headphones despite it being totally counterproductive, this will work.
https://www.amazon.com/Avantree-Bluetooth-Transmitter-Receiver-Speakers/dp/B01H6I3YGK/ref=sr_1_24?ie=UTF8&qid=1493082049&sr=8-24&keywords=bluetooth+transmitter

Do you want to stream from Internet Streaming Services, or are you more interested in Streaming Music you have stored on your computer?

If primarily Internet Streaming Services, then the Google ChromeCast-Audio ($35) seems to be exactly what you are looking for -

https://store.google.com/us/product/chromecast_audio?hl=en-US

This device uses the Computer Network. Great for Streaming Services, but less great if you want to play stored music.

If you want some type of Bluetooth Device, then there are couple that have very long range -

Avantree Oasis Plus - $79 -
https://www.amazon.com/Avantree-Bluetooth-Transmitter-Receiver-Simultaneously/dp/B07BQYYDNJ/

Avantree Oasis - $59 -
https://www.amazon.com/Avantree-Bluetooth-Transmitter-Receiver-Certified/dp/B01H6I3YGK/

Vifly-Koo Bluetooth 4.2 - $49 -
https://www.amazon.com/Bluetooth-Transmitter-Receiver-Viflykoo-Adapter/dp/B078YNDVXV/

These are Transmitter and Receiver with a 150ft range.

However, your Network Router should have considerable range. Unless there is something obstructing it. And you can by Range Extenders for Home Networks. But it should easily reach 20ft ...again... unless there is something obstructing it.

There is a Network Analysis App that you can get for your Smart Phone that will tell you what is going on on your network. I could be that you and everyone around you is crowding the same Wireless Network Channel. You might be able to improve things by simply switching to a lesser used channel.

Let me see if I can find a video demonstrating this app.

https://www.youtube.com/watch?v=HW2b2yB69W8

There are dozens of these on YouTube.

Can you tell us SPECIFICALLY what Network Streaming Device you are currently using. Well it seems you have bought an Airport Express now, but what were you using before that.

Most device today come with some Network Streaming capability. For example, my BluRay Player (Sony) has the standard video streaming services - Netflix, Hulu, Amazon - but it also has - Spotify, Slacker, and Pandora - If you have a paid service, you can make playlist and have a preset list of song you want to play.

You need a receiver like this or this for the headphones and a transmitter like this (USB) or this (Optical) for the PC

I'm no expert when it comes to audio so be gentle but if it's just the audio you're really after woudln't some kind of wireless technology work for your needs? e.g. bluetooth connectivity on the custom desktop and some bluetooth enabled headphones? Maybe even some type of DECT device.

Range is usually the issue with these types of devices - maybe that's a factor?

Something like this too;

https://www.amazon.com/Avantree-Bluetooth-Transmitter-Wireless-Receiver/dp/B01H6I3YGK

Or if budget isn't really a concern some Sono devices allow you to plug a laptop output into their devices; https://www.sonos.com/en-us/shop

Just a thought.

I'm creating an outdoor setup that needs to be portable and loud. I'd like to be able to bring "the setup" to my pool for parties and play music off an iPhone but I'd also like to bring it to the local park to run movie nights for the kids in town, running the sound off of my laptop.

Ideally it would be enough sound to fill a 50' x 50' outdoor area with maybe 40 people in it, and it would be as wire-free as possible.

Right now I'm considering an aux splitter connected to two of these Avantree Oasis LONG RANGE Bluetooth Transmitter and Receiver, aptX Low Latency, Optical RCA 3.5mm Audio, VOICE & DISPLAY, BYPASS for TV Speakers [24M Warranty] https://www.amazon.com/dp/B01H6I3YGK/ref=cm_sw_r_cp_api_LOzTzbCA7VW50 Which would allow me to broadcast audio to four Bluetooth devices, which I'm thinking would be maybe these AOMAIS GO Bluetooth Speakers,Portable Indoor/Outdoor 30W Full Volume Wireless Stereo Pairing Home Theater Systems Waterproof,Booming Bass with Power Bank,Durable for Pool Party,Beach,Camping(Black) https://www.amazon.com/dp/B071H8MJ99/ref=cm_sw_r_cp_api_CPzTzbN2PE2P3

At 30 watts each that's 120 watts of sound which I'm hoping would be enough if the speakers are at the four corners of the area?

This seems complex and expensive at $400-ish and maybe not like the best idea but I don't have a lot of other ideas for portable, mildly weather proof and easy setup?

[You could use this](Wireless HDMI Transmitter and Receiver,PAKITE 5G Wireless HDMI Extender for TV Audio Video,1080P Full HD 3D AV Sender with IR Remote Control Support 492FT Transmission for Projector Monitor Home Use https://www.amazon.com/dp/B07SR2X7QM/ref=cm_sw_r_cp_apa_i_THErDbC7TVSJK) for hdmi

[Or this](Avantree Long Range Bluetooth Transmitter Receiver for TV & PC, Wireless Audio Adapter Extender for Home Stereo Speakers, aptX Low Latency, Dual Link, Voice Guide, Digital Optical AUX RCA - Oasis https://www.amazon.com/dp/B01H6I3YGK/ref=cm_sw_r_cp_apa_i_iLErDbQQGSX75) for optical out

In my experience you really want to avoid wireless if at all possible. It generally adds complexity,and inevitably becomes a head ache down the road.

Best bet is to run a wire hidden in the trim to the location it needs to plug into.