Doesnt resistance mean same as impedance??

İmpedance is resistance which changes with frequency whereas simple resistance is constant with frequency. 

@cakyol 

thank you - that is as accurate a summary as i can imagine

So far, I thought impedance meant the same as efficiency.  That is why I chose 8 ohm speakers.  Not sure why someone would purchase 4 ohm speakers because wouldn't that require a more powerful amplifier?  So, why then do manufacturers make 4 ohm speakers?  I didn't realize Tekton manufactures some of their speakers in both 4 ohm and 8 ohm.

I think Carbon Miller has a lot of knowledge.

I wish this forum could provide Zoom seminar so we could learn more from some of those who have a lot of knowledge to share.  I think just knowing the basics could save us all a lot of money to avoid making some mistakes.  Perhaps, Audiogon could think about providing Zoom seminars.  This would really provide those like myself who don't have the knowledge a way to gain better understanding.  Otherwise, I think a lot of us still do not have the sound they are looking for.  Carbon Miller would be an excellent teacher along with others in this group.  Perhaps provide Zoom meetings to allow us to see one another and to have discussions.  

I still wonder why some speaker manufacturers design their speakers with a 4 ohm design as opposed to 8 ohm.  Vienna Acoustics comes to mind.  I also wonder why some manufacture their speakers with soft dome speakers vs Beryilium.  I know soft dome tweeters sound less bright.  When I listened to Vienna Acoustic speakers I noticed they sound nice for classical music.  However, I thought they  lacked the detail such a cymbals when listening to jazz.

@larry5729

pls watch all three to learn

Okay, Okay - we get it now:

'Resistance opposes Flow'

'Impedance rejects change'

Therefore:

Remocrats - go <against> the flow

Depublicans - impede all change  

and somewhere in there is a Phrase Change function too....

{ducking...}

Jim

In simple electronic models, a resistor is considered perfect as is a capacitor and an inductor. In practice, they all are flawed and have small elements of each other in their behaviour. For example a simple inductor can be a coil of wire, but obviously a length of wire has resistance.

Impedance is the real-world aspect of a circuit made up of resistors, inductors and capacitors. It accounts for e.g. voltage and current not being always in phase. In domestic audio, the measurement is encountered most reliably when describing loudspeakers with passive crossovers.