There may be several ways of solving this. Much depends on your original audio source. And what Bluetooth variant it uses. If it's bluetooth 4 then matching headsets may reach your lair.

If you're listening to stuff via the internet then you might consider extending your Internet via powerline systems and simply using a smart phone as the player and bluetooth from that. The only problem I find with that idea is that phones in pockets or being jostled about interrupt the stream. Put the phone on a table is fine so long as you remember to take it with you again. I used to use stored talking books on my phone while doing hedging work when I had to keep it in a pocket and the intermittent interruption was a PITA..

Bluetooth 5 is supposed to have a range of 800 feet (unobstructed) so long as you can jack your audio source into a bluetooth 5 transmitter and buy a bluetooth 5 headset. I haven't tried that system.

pgk

Robin

Realistically you can't beat stringing a wire down to your workshop and using a local Bluetooth transmitter.

That said a Google search turns up a number of range extenders which take the Bluetooth signal in and re-transmit it. Some with sticky up external aerials which, presumably, receive and transmit better than the internal type.

Theoretically best solution would be a receiver unit on one side of the wall or floor and transmitter the other with a cable between running through the major obstruction. Plenty of Bluetooth widgets with switched transmit or receive capability, I have a teeny, 1/4 matchbox size, one on my TV to run my headphones, but I don't see an official pair. I surmise a pair of the boxes I have could be made to work, just a matter of hooking up power via the USB plugs, setting one to transmit, the other to receive and an audio cable between.

Think my box was about £5 off E-Bay. Coupled with a pair of LiDL headphones cheap enough to try without being too far out of pocket if it didn't work. The official unofficial kid sister has just given me a pair of Sony WH-XB900N headphones which are very nice. Comfortable with a good sound and range even from the cheap transmitter. But for £140 I'd have expected better instructions. Large sheet in multiple languages that basically tells you nothing about how to use or set up the headphones. Major gotcha is that you set the volume on the source. No controls beyond and on-off switch and pair/reset button. As ever these days manual is on t'net.

Not Bluetooth but ages ago I bought a range extender for my DECT cordless phone that almost doubles the coverage. My phone line went into the workshop office because thats where I wanted (then) fast internet and the Siemens Gigaset base station only reached the back half of the house reliably. Repeater sits about 6 ft inside the insufficient signal line so I have signal right out to the front gate. From this I conclude the repeater principle is fine. Just a matter of set-up.

Clive

Old Mart

My Hitachi plasma TV has a menu setting to control whether plugging a cable into the audio output jack also turns off the main speakers or leaves them running. Mine is set to leave the main speakers on as I only use the headphones when other watchers find my comfortable listening volume too loud.

Pretty much the norm for relatively modern TVs I think.

Finding where the setting is in the menus being another matter entirely.

Clive

Almost exactly reflects my experience, and I found it didn't seem to make any difference which phase I used at the 3-phase end. I was streaming a live CCTV camera through about 50 metres of overhead mains cable with a similar distance through internal wiring.

Mike

I'm not actually deaf, my hearing is quite good but I do have tinnitus which makes it hard to discriminate particular individual voices or sounds. For reasons I don't fully understand, if I use 'proper' headphones (not the little earbuds) the music seems to be inside my head, bypassing the noises in my ears, and I can even pick out individual instruments in an orchestra.

I'm sure my condition is largely due to working with noisy machinery in the days before ear defenders were readily available, but the worst ear is the one I used for many years to listen to radio 4 through an earbud while working.

Mike.

I mentioned earlier that I was thinking about bluetooth headphones to use with my tv late at night, and this thread has pushed me into getting some. For convenience, I bought some Sennheiser HD 350BT headphones at the nearby Argos. They cost £65 ane since then, I have found that you can get them cheaper by shopping around. They don't have any other connection than bluetooth, so I was committed. One reason for wanting to give up on a wired connection is the poor quality of the 3.5mm socket in the tv, a problem I had with the previous Sony as well as the current Toshiba 55UL5S63DB. I had to fiddle about with the plug nearly every time that I made connection to get the sound to come through. It took me about an hour to figure out just how to access the menus in the Toshiba, as the instructions are vague, but as soon as I had understood how, I had the headphones working. The tv speakers go off by default and the volume control is only working on the headphones, not the tv remote, either the Toshiba or the Virgin one. When the tv is switched onto standby, it goes back to normal speakers when being switched back on, but it is then quicker to set up the bluetooth if required than to couple up the cable for the old headphones. At this price range, being higher than I would normally pay, but well below the high end products, the build quality and sound are the best I have ever experienced, and the 30 hours battery life seems plenty to me also.