I used some cheap self-powered-amped speakers and little passive speakers too (amped by the internal earphones amplifier of the receiver pocket). It depends on what audio power you need.

If you need high audio level, I would use self powered-amped ones (JBL Clip 2 by example. They are bluetooth but they have a minijack input too..)

Sorry, the photo is blurry..

Best

Philippe

how is the audio quality?

I would not trust the super cheap units to provide a flawless sound quality during production with moving receivers. Although the quality sounded OK in my tests with a handheld portable radio and a 2.1 soundbar with a built in tuner.

Best wishes

Bonemap

idea is to have several speakers and send different audio channels eg. from Isadora or Ableton Live to each of these speakers

Hi,

There are super cheap FM transmitters like this 4 channel device . I have a bunch of these that came from a clearance sale with some other gear. I have just tested one and got a signal at approx 30 mtr using a regular battery operated transistor radio. The issue might be how crowded the FM band is where you want to use it and how much other interference that might affect these in your venue. The more you spend the better range and quality you will get with radio transmitter and recievers.

This one looks like you might get more than 4 channels, of course you will need one for each output channel from your audio interface. 

I haven't tried these in production, but they are cheap enough for use as a proof of concept before paying out a bigger expense.

best wishes

bonemap

I tried to do this for a performance, it never worked more than one channel. And in terms of reliability, bluetooth speakers were not good (audio lags, connection loss..)

My bet was to use batteries powered speakers plugged into wireless In-Ear monitor systems.

4 audiocards outputs -> 4 InEar monitors transmitter      =====     4 InEar wireless monitor receivers -> 4 Self Powered Speakers.

Worked very well, and HF Range was awesome..

Best

Philippe

Are you on Mac or Win? 

If they need to be live, then I think there's a way of setting up the OSX sound so that you can send different channels to different devices, but i don't know how many devices you can bluetooth into simultaneously. a workaround would be to have the files playing off of different computers networked together with one control machine.