Calculator for Impedance Correction Circuits

Usage of impedance correction circuit:

Let's assume you have a loudspeaker with 8 Ohm, having its maximum impedance of 16 Ohm at 1000 Hz. The impedance rise is of no importance when a conventional amplifier is being used.

However, if you connect this speaker to a valve amplifier, then this impedance rise leads to an excessive level at 1 kHz. Therefore, this impedance rise should be compensated for in the crossover.

To achieve this a RLC element (pictured below left) should be connected in parallel to the crossover.
The components' values are calculated by entering by entering the following data:
- the nominal impedance of the loudspeaker
- the increased impedance that needs to be corrected
- the frequency where the maximum impedance occurs
- the neighbouring frequency where the impedance drops
exactly to half its value (see below)
 

RLC Serial Resonant Circuit Calculator		Resistance to be entered with 2 decimals Please enter decimal separators as "."
	Values	Impedance	in Ohm	Rmin of		Ohm at	Hz
	R in Ohm:	100 Hz	120 Hz	150 Hz	200 Hz	250 Hz	300 Hz
		400 Hz	500 Hz	600 Hz	700 Hz	800 Hz	900 Hz
	L in mH:
		1000 Hz	1200 Hz	1500 Hz	2000 Hz	2500 Hz	3000 Hz
	C in uF:	4 kHz	5 kHz	6 kHz	7 kHz	8 kHz	9 kHz
		10 kHz	12 kHz	15 kHz	20 kHz	25 kHz	30 kHz
	Note:
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Hint: please choose coil and resistance with adequate load-carrying ability.

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