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Old 5th December 2013, 06:50 AM   #1
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Default Confuse... When to use a Zobel network ?

Hi, everybody

I'm confusing about a zobel network. I know what the zobel network is. It is used to correct an impedance of the speaker but I don't know "When to use it ?" I mean, How is the sound likes as the zobel should be added ?

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Old 5th December 2013, 07:07 AM   #2
Lojzek is offline Lojzek  Croatia
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Zobel is not a must have and what it does to sound you
can check easily while measuring. Not only it's supposed
to vary impedance, it does the same to FR. You can get
away with or without it.
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Old 5th December 2013, 07:53 AM   #3
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It helps give a stable impedance, so the crossover performance can be more even.
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Old 5th December 2013, 08:13 AM   #4
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IMHO, the Zobel was needed in the past because with a flattened impedance the crossover could be easily calculated. This is not true anymore, because you can design the crossover with software that take into account the real impedance of the drivers. Look at reputable designs, you will hard pressed to find a Zobel, if you even find one.

Ralf
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Old 5th December 2013, 09:31 AM   #5
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Seems like everybody tried to tell me a zobel doesn't help in sound but in crossover design.

So, If I have a speaker that doesn't have any filter or network (that's mean it's directly connected to the amplifier) and then added a zobel network onto it.

Is there anything different in sound happened ?
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Old 5th December 2013, 09:41 AM   #6
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If you have a driver that doesn't need a crossover (very unlikely, but there are a few), why do you want to add a Zobel?
I don't have the tools at hand so cannot check, but I suspect that adding a Zobel will slightly alter the FR, thus altering the sonic.

Ralf
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Old 5th December 2013, 09:52 AM   #7
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Zobel network is needed to correct some instabilities of the amplifier, because of (imprevisible) phase variations caused by wires or/and crossovers, drivers, etc. Problems are occuring at high fréquencies (10 Mhz or so...), and cause some sound harshness. This can vary from case to case, from time to time. No general rule exist. Usual values are 10 ohms and 0.1 µF in series.

Zobel network is like an insurance, one use it, hoping that it is useless !
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Old 5th December 2013, 10:45 AM   #8
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I can be wrong, but this kind of Zobel is usually implemented in the amplifier. My TDA7240 amp has a 2R2 + 0.10uF Zobel, and this is mandatory to prevent oscillation.

Ralf
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Old 5th December 2013, 11:21 AM   #9
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Quote:
Originally Posted by presscot View Post
So, If I have a speaker that doesn't have any filter or network (that's mean it's directly connected to the amplifier) and then added a zobel network onto it.

Is there anything different in sound happened ?
Unless it is a funny valve amp with high output impedance then there will be no change in sound.

Quote:
Originally Posted by giralfino View Post
I can be wrong, but this kind of Zobel is usually implemented in the amplifier. My TDA7240 amp has a 2R2 + 0.10uF Zobel, and this is mandatory to prevent oscillation.
That is correct, Boucherot cell is another name for this kind of network.
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Old 5th December 2013, 03:00 PM   #10
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Quote:
Originally Posted by richie00boy View Post
That is correct, Boucherot cell is another name for this kind of network.
Very impressive sounding! I'm going to use it from now on. Now it's back to my padded Boucherot cell.
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