How much power needed to drive 91db speakers?


Sonus Farber lists the sensitivity of my speakers at 91 db SPL@ 1 meter @4 ohms.  They also say I should use  50-450 watts of power. My PS Audio amps pump out 500 watts @4ohms, so the max isn’t a problem, but if I switched to something 15-50 class A watts, would that be more than enough power?  
 

Thanks in advance.

curiousjim

Showing 1 response by mylogic

  • My input on the output required.

Simple logic….. l am not an engineer but time has taught me a few things which l put on offer and share here.

1. Just make sure your amplifier is not having to work flat out to drive your speakers.
2. Some people may think their amplifiers are matched just because their speakers go loud.
3. Remember 4 ohm and 6 ohm speakers draw more watts per channel power than 8 ohm

Amplifiers must have a reservoir of extra power to draw on for when the music demands. Underpowered and there will be clipping, distortion and in extreme circumstance’s the amplifier unable to control the drivers. Sometimes the cones can get torn or distorted and written off when an amplifier looses control.

In simple terms a mismatched amplifier will overheat and possibly fail, (if no protection circuits) and could ruin your speakers.

A comparison would be equivalent to putting an English Mini engine into a racing car. It would work fine at first but inevitably burn itself out.

 

Simple facts but as true today as when l started with hi-fi back in the 1960s.