Sensitivity question

Thanks for all the great responses---it was a huge help! @ditusa Great article!! 

@bluorion,👍

I drive a pair of 83db speakers with a class A 28wpc amplifier. Normally I would have never even thought to do this but since we do audio repairs, the amp came in and to test the repair we hooked it up. It drove the speakers better than many other amplifiers we typically would use. So give it a try and see what happens.

Happy Listening.

The following will help advance the answer to your question, which some above have touched on. https://audiojudgement.com/speaker-impedance-curve-explained/

We  mustn't confuse or obfuscate these two factors even though both determine whether a given amplifier will drive a give speaker satisfactorily.

Resistance, ohms, of a speaker is the main determinant of how hard it is for the amplifier to drive it without distortion.   A statement that a speaker 'is' say 8 ohms is a subjective judgement of the lower ohm areas of its impedance curve plotted against frequency.  A 4 ohm or less speaker will need an amplifier with a stiff power supply, not merely large but, more importantly, not weakening when asked to drive a low frequency at a low resistance.  The amplifier's output in watts is not the most important issue here, although high power amplifiers tend to have big strong power supplies.

The dB measure of a speaker is how efficient it is - how much sound you get for each watt put in.  83db is very low.  You need a lot of watts to drive it to high sound levels.  Conversely a 100dB speaker is very efficient and a few watts will drive it very loudly.