Has anyone "bluetoothed" the sound to an amplifier?

I would think it would be possible to cut the leads to the speaker splice them intot the headphone lead on the ubiquitous bluetooth transmitter like this. Not sure if you would need to reduce the sound to line level or not - it oculd depend upon the adapter. You would also need to get a 5VDC converter and supply power to the USB end. Some units do have internal batteries.

https://www.amazon.com/KingFut...phones/dp/B08D3XCNHN

Again, I've never done this, but it seems all the pieces are out there to do it rather simply if you can do a little bit of wiring.

Rod Miller did that and sent the sound to earphones. Very effective and very loud.

Any reason why this couldn't be built into a Bluetooth equipped locomotive? Most Lionel locomotives are already Bluetooth equipped. I haven't heard a Lionel Super Base B unit, but this approach would blow the doors off any on board speaker? Smaller scales like HO, already have this.

One of the HO manufacturers already does something like this with external subwoofers if I’m not mistaken.

I tinkered with this several years ago, a BT transmitter in the engine and a BT speaker system.  It works, but I vastly prefer the sound coming from somewhere near the locomotive!

Many years ago I did the layout tour of north central Arizona in the Prescott area which used to be an annual ritual of mine along with their awesome swap meet.  There was an HO layout that had sound connected through a massive sound system that was an exquisitely detailed Southern Pacific themed layout.  The sound of the prime movers literally shook the room like the prototype.  It was actually pretty cool for someone like myself who is just as happy without sound as I am with sound.

My thought was to only deliver the bass to a sub woofer, just like a home theater. Bass is not very directional.

@Oman posted:

My thought was to only deliver the bass to a sub woofer, just like a home theater. Bass is not very directional.

That might work, you'd have to also have a crossover somewhere to filter out the higher frequencies.

@Oman posted:

My thought was to only deliver the bass to a sub woofer, just like a home theater. Bass is not very directional.

@gunrunnerjohn posted:

That might work, you'd have to also have a crossover somewhere to filter out the higher frequencies.

You might as well send the whole audio stream, since you're dealing with speaker level outputs inside the locomotive, and you don't want to bother with line-level electronics conversion there.  Additionally, any Bluetooth codecs you use will likely support 20Hz-20kHz anyway.

In the subwoofer, after the output of the DAC, you can just put a line-level filter there - then connect that output to an amplifier for the subwoofer.  Any lowpass filter at the speaker level worth it's salt will get expensive because of the size of the inductors required.  Depending on the electronics used to do the ADC and Bluetooth transmission or the equivalent on the receiving end, you could also do it in the digital domain - but that takes a lot more expertise IMHO.

Correct, "somewhere" didn't imply I was limiting that to inside the locomotive.  In truth, it's far more sensible to put it in the bass receiver as you only have to do it once no matter how many locomotives you equip with the technology.