Resource to calculate, building and measuring Hi Fi Loudspeakers and more...

zondag 20 januari 2019
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    Calculating Driver Reference Efficiency

This calculator is intended to help you determine the reference efficiency of any loudspeaker.

There is no standard for stating the efficiency of a loudspeaker, so some manufacturers will give a rating at 1kHz for a subwoofer. This makes the speaker seem like it is a lot more efficient, but it is unfair when comparing to another subwoofer with an efficiency rated at 100 Hz ( and not many subwoofers are used at 1kHz anyway :-) ).

This formula will give you a reference number that will allow you to compare subwoofers on an equal basis.  
Common percentages range from 0.3 to about 1.6

Power Handling of the speaker :   Watt
Fs :   Hz
Vas :   Liter
Qes : 
Reference Efficiency :   %    SPL(dB)
Acoustic Power :  W

Click here to calculate the Port airspeed