Some higher end component sets use zobels in their crossover network to equalize the impedance peak on the woofer. However I always have wondered can a zobel network be applied to subs in a car? To what effect will it have?
Replies (1)
swez on 04/14/2004 09:30:29
QUOTE:
Impedance Correction Network:
This type of network (marked 'A' in previous diagram) is also called a Zobel network. It uses a resistor and a capacitor to counteract the effect of the voice coil's inductance and allow the crossover to follow the proper slope. In the following graph you can see a smoother impedance curve near the crossover frequency. This is due to the RC (resistor/capacitor) network.
http://www.bcae1.com/xoorder.htm
Zobel networks do help smooth out the peaks and valleys in a response curve plot. They compensate for changes in impedance of the voice coil at various frequencies within the operating range of the driver employed. These are generally advanced passive component configurations designed by pretty sharp engineering types.
An active control device such as a graphic EQ or parametric EQ can help smooth out the plot as well. But you would need a tone generator and RTA (maybe an SPL meter might work) but this would be a very tedious process w/o an RTA and calibrated test tone generator and calibrated microphone.
Swez
PS Want more reading? Go to Google links:
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22zobel+networks
Replies (1)
swez on 04/14/2004 09:30:29
QUOTE:
Impedance Correction Network:
This type of network (marked 'A' in previous diagram) is also called a Zobel network. It uses a resistor and a capacitor to counteract the effect of the voice coil's inductance and allow the crossover to follow the proper slope. In the following graph you can see a smoother impedance curve near the crossover frequency. This is due to the RC (resistor/capacitor) network.
http://www.bcae1.com/xoorder.htm
Zobel networks do help smooth out the peaks and valleys in a response curve plot. They compensate for changes in impedance of the voice coil at various frequencies within the operating range of the driver employed. These are generally advanced passive component configurations designed by pretty sharp engineering types.
An active control device such as a graphic EQ or parametric EQ can help smooth out the plot as well. But you would need a tone generator and RTA (maybe an SPL meter might work) but this would be a very tedious process w/o an RTA and calibrated test tone generator and calibrated microphone.
Swez
PS Want more reading? Go to Google links:
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22zobel+networks
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