Acoustics Ballspeaker (small)
In our labs we have a number of speakers which we have built by ourself. These speakers are contructed with a standard Vifa 4.5 inch MidTone driver. As cabinet we have used a 160mm trawl-net ball like the one seen on picture below.
Please make sure that speakers dont get (broadband) signal levels above ~0.7Vrms because they'll change characteristics due to internal heating - especially if you keep signal on for long time (>30secs) or use broadband signals - signal containing freqs below ~700Hz.
As it can be seen we have various models available and we also use some speakers as "calibrators".
Datasheet for det Vifa M10MD39-08 driver