Hi all

I need to understand exactly how speaker sensitivity / resistance works. I have the basic idea i think. A speaker of higher sensitivity requires less power to reach the same db as a speaker of lower resistance. Or in plainer english, 1 watt of power will cause more db from a speaker of higher sensitivity. Am I right here?

Now, how does this come together with the resistance of a speaker? how much better (or worse) does a 4ohm speaker perform than an 8ohm speaker, if they both have the same sensitivity?

What are the key technical factors to look for when choosing speakers? Is it a higher sensitivity with lower resistance?

Also, I see that power amplifiers also rate much higher when driving speakers of lower resistance. Is this automatic? I.e. if i unplugged 8ohm speakers and jacked in 4ohm speakers into the same amp, would it start punching out more power based on some rule of physics? Or does the amp need to be 'told' that it is driving lower resistance speakers.

My understanding is that if i buy 4ohm speakers that have the same sensitivity as [my old] 8ohm speakers. I will get double the db out of them / will only need to turn my amp half way as high as i did before to get the same db as the 8ohm speakers.

confusion.......

Regards
Justin