Amplifier current vrs watts; why is current more important?


Lately when talking to knowledgeable people in the audio industry I’ve been hearing how current delivery is more important than watts in determining weather an amplifier will drive a speaker.
So what exactly is current and how does it effect speaker performance? How can a amplifier rated at 150 watts into 8 ohms vs one rated at 400 watts into 8 ohms be a better match for a hard to drive speaker?
hiendmmoe
hiendmmoe

Showing 1 response by sheffieldrock

The sound level of reproduced music is proportional to the voltage. Hence, voltage is most important.; A sagging voltage would ruin the experience.  How much current you need, depends on your speaker’s resistance to AC (a.k.a. impedance) in the audible range. Well-engineered cone loudspeakers like Tannoy, Lowther, Wilson, etc. have a high resistance to AC and require hardly any current to prevent the voltage from sagging. Electrostatic speakers, which have a low resistance to AC require a lot of current to prevent the voltage from sagging.