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L-pad attenuator
Calculate a fixed two-resistor pad for a resistive driver load and estimate continuous resistor dissipation.
Inputs
Example valuesResults
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The calculation
k = 10^(attenuation / 20) Rs = Z × (1 − 1/k); Rp = Z / (k − 1) Pseries = Pin × (1 − 1/k) Pshunt = Pin × (k − 1) / k² Pdriver = Pin / k²
Assumptions & limits
Connect Rs in series before the driver; connect Rp across the driver. Assumes a purely resistive load. Power is the input to this pad, not the amplifier’s nameplate rating.
Background: Passive crossover design · Elliott Sound Products
