I'm trying to build a reactive load box, so I can run a guitar amplifier without a speaker. It's basically a device that simulates the impedance/frequency curve of a relatively high power speaker.
I need 4Ω nominal impedance, but my local electronics store does not sell 4Ω 100W resistors, so I though of getting four 16Ω resistors and put them in parallel.
On the right it's the correct impedance curve using a single 4Ω resistor, and on the left, the same circuit but using four parallel 16Ω resistors.
Why are the simulation results different? I thought these circuits were supposed to be equivalent.
Edit by Steve G.: The following circuit gives the same results as the 4 x 16Ω resistor circuit (note the floating wire):