Make your own free website on

Driver Attenuation Circuit

 This calculator is intended to help you design an "L-pad" type circuit. It can be useful if you need to attenuate (reduce) the sound level of one speaker so that it will match the output of another driver.

Circuit Diagram
Shelving Network

 This circuit is commonly used on tweeters because they are generally more efficient (higher sensitivity) than woofers.

 It can also be applied to the "rear fill" speakers in a mobile audio application. It is very undesirable to have the soundstage in the rear of the vehicle (which will happen if your rear speakers are too loud).

Note : You can accomplish this using only 1 resistor in series with the driver, however, the impedance load presented to your amplifier will be increased. When you use a L-Pad, the impedance load stays the same as it was before.

Explanation of Terms
R1, and R2 are resistors.
 To use this form, enter the impedance of the driver you want to attenuate, and then enter how many dB you want to reduce the output by (3 dB is the equivalent of cutting the power to the speaker in half). Then just click the "Calculate Values" button, and your answer will appear in the empty text boxes.
Enter Impedance Ohms
Enter Desired Attenuation  dB SPL
R1 =  Ohms
R2 =  Ohms

Get Paid to Listen to Music

Accessories  Home  Links  Software  Loudspeakers 101  E-Mail