Speaker Efficiency and Durability?

Question

If i have 2 speakers with an impedance of 4 ohms and 8 ohms, w/c of the 2 is more efficient? W/c is more durable regardless of the wattage?

Answer 1

JSF. Finally, somebody who understands!

Answer 2

Those "ohm" ratings are more for your amp.  A more "durable" and "efficient" amp could handle a 4 ohm speaker.  And a less durable and efficient amp would require an 8 ohm speaker.

Speaker efficiency is documented as "sensitivity" ratings and measured in "dB" (decibals).  A three dB increase makes a speaker TWICE as efficient.  For example, a speaker with an 89 dB sensitivity rating needs TWICE as much power as one with a 92 dB rating.

As far as durability, how much power your speaker is rated at can give you an idea of how much abuse it can handle.  But what most people forget is that too LITTLE power destroys speakers.  Turning your amp up past two-thirds gain to get the volume you want is what kills speakers faster than anything else.

If it's not loud enough, buy a bigger amp, more efficient speakers or both.