L pad calculator - attenuation dB damping impedance decibel loudspeaker voltage divider - sengpielaudio
 
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L Pad  calculator for loudspeakers
 
An L-pad is a voltage divider  

For attenuation A (damping) take a positive dB value, used as convention.
L-Pad Pic - sengpielaudio     L-Pad Formula - sengpielaudio

For attenuation A take a negative dB value, used as convention.
L-Pad Pic - sengpielaudio     L-Pad Formula - sengpielaudio

Calculate the L pad resistor network
The calculator below requires a positive value for A in dB.

 
 Speaker Impedance Z  ohms   
Wanted Attenuation A  dB  
 
                
 
                    L-pad Single resistor 
R1 = Rserial  ohms R  ohms
R2 = Rparallel  ohms  
Ztotal  ohms  Ztotal  ohms
 
A
(dB)
Z
(ohms)
R1(ohms) R2(ohms)
  −3 4 1.17 9.70
  −6 4 2.00 4.02
  −9 4 2.58 2.20
−12 4 3.00 1.34
−15 4 3.29 0.87
  −3 8 2.34 19.39
  −6 8 3.99 8.04
  −9 8 5.16 4.40
−12 8 5.99 2.68
−15 8 6.58 1.73
 
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