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
- 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)
Hint: please choose coil and resistance with adequate load-carrying