Brit native, not a teacher.
In the sentence you quote, "loads of different speakers" means "many people giving verbal presentations".
In your audio based example, the phrase "loads of different speakers" would mean the "varying electrical impedance offered to an amplifier by different loudspeakers". I know that was not the original sentence, I just wanted to highlight that the same group of words would have entirely different meanings in the two different contexts. In presenting terms, a speaker is somebody who speaks, and in audio terms, the word "speaker" is actually an informal abbreviation for "loudspeaker".
"Loads" is often used to mean "much or many". In technical electrical or engineering contexts it means something quite different.
Hope that helps.