The primary function of the circuit is to dampen and eliminate the effects of driver resonance on crossover networks.
For crossovers to works as expected, it's important to have a nearly resistive impedance, at least in the crossover frequency region.

If the driver has an undamped resonance peak wich is located less then two octaves from a highpass crosspoint, this circuit will greatly improve driver performance.

It's usefull on tweeters and midrange drivers.

It's possible to use the circuit on resonances in the lower octaves, but it usually calls for some extremely large value inductors.

• You either enter the minimum impedance ( Rmin of ), indicate at which frequency this should be ( Ohm at ) and then press Calculate R-L-C. With the buttons with the buttons   -> <-   or   <--->   the resonance may be narrowed or widened.
• Or you enter the R, L and C values on the left side and press Calculate Impedance.

Speaker Impedance in Ohm         R of:     Ohm at:    Hz
 Reduce Impedance Range Expand Impedance Range
 R: Ohms* L: mH C: µF * R is the sum of resistance-value (R) and DC-resistance of the inductor (L)

10 Hz 11 Hz 12 Hz 13.5 Hz 15 Hz 17.5 Hz 20 Hz 22.5 Hz 25 Hz 27.5 Hz 30 Hz 35 Hz
40 Hz 45 Hz 50 Hz 55 Hz 60 Hz 65 Hz 70 Hz 75 Hz 80 Hz 85 Hz 90 Hz 95 Hz
100 Hz 110 Hz 120 Hz 135 Hz 150 Hz 175 Hz 200 Hz 225 Hz 250 Hz 275 Hz 300 Hz 350 Hz
400 Hz 450 Hz 500 Hz 550 Hz 600 Hz 650 Hz 700 Hz 750 Hz 800 Hz 850 Hz 900 Hz 950 Hz
1.0 kHz 1.1 kHz 1.2 kHz 1.35 kHz 1.5 kHz 1.75 kHz 2.0 kHz 2.25 kHz 2.5 kHz 2.75 kHz 3.0 kHz 3.5 kHz
4.0 kHz 4.5 kHz 5.0 kHz 5.5 kHz 6.0 kHz 6.5 kHz 7.0 kHz 7.5 kHz 8.0 kHz 8.5 kHz 9.0 kHz 9.5 kHz
10 kHz 11 kHz 12 kHz 13.5 kHz 15 kHz 17.5 kHz 20 kHz 22.5 kHz 25 kHz 27.5 kHz 30 kHz 35 kHz

R-L-C Circuit for Tube Amplifiers

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