Obviously the resistance in ohms from the speaker represents the power requirement needed, for example 4 ohms will consume more power than an 8 ohm speaker.

9v/4=2.225 amps where as the 8ohm will draw 1.125 amps, but does that mean better quality? or does that mean the 4 ohm will simply handle the deeper tones (bass is better for example)

What's the advantages of more amps in a speaker? is there anything?

 

At one time, 8 ohms was pretty much the universal speaker impedance. The modern trend is to use lower voltages, so 4 ohms is much more standard. You can push current through 4 ohms with a lower voltage than with 8 ohms.

For headphones, though, the impedance has gone up. Instead of 8 ohms, 32 ohms or greater is most common.

The quality of the speaker is dependent more on the quality of manufacture than on the voice coil impedance.

 

Fair Enough.. makes sense (materials used, the cone material i suppose). I just can't help feel the more current more air waves to push around....

 

2 ohm and 4 ohm speakers are used in cars because the 13.8V supply will allow a bridged amplifier to produce 10W into an 8 ohm speaker, 16W into a 4 ohm speaker or 25W into a 2 ohm speaker at clipping.

At home the power supply for the amplifier can produce a high enough voltage for 8 ohm speakers to produce high output power.

If the amplifier has enough extra power then simply turn up the volume control for the speaker to push more air around.

 

Until Bose came out with their speakers a good speaker had a fatter magnet than a speaker of less quality. The magnet makes it more sensitive to changes in current giving them a higher fidelity.