Usually denotes devices in public areas or electronic products for personal use. Not for individual headphones. They used a loudspeaker to address the crowd.
Pro Tip 2/3
Size Variations
Can vary in size dramatically, from small in smartphones to large for concerts. The festival stage had giant loudspeakers for the music.
Pro Tip 3/3
Implies Amplification
Implies sound is made louder for multiple or distant listeners, not just its source volume. The guide used a portable loudspeaker in the tour.