We have a current setup of using a whistle in coaching situations for starting sequences. I built a small RaspPi box that, through a 12 V relay, will enable a compressor with a regular coach whistle attached. I'd like to replace this with a speaker that plays a tone. I would need a speaker that can output around 120 dB in a lower frequency. Maybe around 2.5 kHz.
Ideally this is a compact speaker. I am packing everything into a portable box so weight is also a consideration. Does anyone have suggestions?
