Tweeter Zobel, or more accurately, RC network. - diyAudio
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Old 15th June 2005, 02:42 PM   #1
LNeilB2 is offline LNeilB2  United States
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Default Tweeter Zobel, or more accurately, RC network.

This is not often discussed, but I've been told that adding an R-C network to some tweeters helpd to refine their sound. I came across this on the LDSG:
"The MDT33 tweeter has a very devoted following. Some have also recommended the use of a Zobel to sweeten the top end."

Your thoughts/experiences?

TIA

Neil
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Old 15th June 2005, 03:08 PM   #2
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it is probably to comensate the inductandce of the coil, but I'm not sure
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Old 15th June 2005, 03:14 PM   #3
RJ is offline RJ  United States
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There is a free program that will help you model the response of your tweeter when adding a Zoebel network.
http://www.pvconsultants.com/audio/crossover/pcd.htm
You'll need Microsft's Excel spreadsheet program to get run it.
Sometimes adding a Zoebel will work and other times just a right capacitor or resistor value does the trick.
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Old 15th June 2005, 03:47 PM   #4
soongsc is offline soongsc  Taiwan
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Default Re: Tweeter Zobel, or more accurately, RC network.

Quote:
Originally posted by LNeilB2
This is not often discussed, but I've been told that adding an R-C network to some tweeters helpd to refine their sound. I came across this on the LDSG:
"The MDT33 tweeter has a very devoted following. Some have also recommended the use of a Zobel to sweeten the top end."

Your thoughts/experiences?

TIA

Neil

How is the RC added? Totally different designs may have different purposes.
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Old 16th June 2005, 05:09 PM   #5
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I thought this rc filter was put in there to flatten out the impedance curve?

thats at least what i'v read.
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Old 5th January 2011, 03:55 PM   #6
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In my current project I use accuton C30 as the tweeter.

The datasheet says its coil inductance is about 0.04mH.

Does it need zobel circuit?
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Old 7th January 2011, 01:32 AM   #7
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I have used Zobels on tweeters before, usually around 2uF or lower, using them did seem to make a cheap tweeter better, but Rod Elliot or perhaps LDC said it make the load on the amplifier better, remembering that this load should be at least flat to 2 octaves above highest reproduced, so if tweeter goes to 25k then the load should be as flat as possible to 100k.

This is where you need to experiment, a small cap and 5W resistor won't set you back more than a dollar, and I always set my Zobels on the back of the driver anyway so very easy to do with-out pulling the XO out
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Old 7th January 2011, 03:53 AM   #8
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Quote:
Originally Posted by LNeilB2 View Post
This is not often discussed, but I've been told that adding an R-C network to some tweeters helpd to refine their sound. I came across this on the LDSG:
"The MDT33 tweeter has a very devoted following. Some have also recommended the use of a Zobel to sweeten the top end."

Your thoughts/experiences?

Neil
A Zobel or conjugate circuit is usually used to flatten out the impedance, specifically the inductance rise. I don't know how it would "sweeten the top end" of a tweeter. They are more typically used on woofers where the flatter impedance may help make crossover design easier. In the case of a tweeter it has less impact on the crossover because it is on the top side of the band rather than near the crossover point.

In either case it can't sweeten the top end unless it changes the response of the crossover network. The amplifier doesn't care either. Most amps are happy to drive a gently rising inductance.

David S.
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Old 7th January 2011, 04:03 AM   #9
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Perhaps by acting as a "strange second order" which BTW i usually reserve for woofers
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Old 7th January 2011, 05:34 AM   #10
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Quote:
Originally Posted by LNeilB2 View Post
This is not often discussed, but I've been told that adding an R-C network to some tweeters helpd to refine their sound. I came across this on the LDSG:
"The MDT33 tweeter has a very devoted following. Some have also recommended the use of a Zobel to sweeten the top end."

Your thoughts/experiences?

TIA

Neil
Can you please post exact link to this article.
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