zobal networks ?

Ehider, your comments about Stan understanding how various gain stages of an amp are affected and Dunlavy ( along with other speaker designers ) "dropping the ball" cracked me up to say the least. Anyone that knows about Dunlavy's background and past products knows that he IS an electrical "genius".

As a case in point, John was building / designing super high speed / ultra wide bandwidth circuitry LONG before most of the other audio "EE's" ever thought about doing such. I would consider David Spiegel to be at the forefront of that movement in the early 70's and Dunlavy just a bit behind him. He is well versed in both AF ( audio frequency ) and RF based circuitry, understands transmission line theory, has built, designed and patented one of the most widely used antenna designs known to man, etc...

This is NOT to say that Stan does not have his moments of brilliance and is able to "work magic" by simply taking a good thing and making it better. I have owned some of his past products and am familiar with his work. This is also NOT to say that John does not cut corners on some of his production models or gets everything "right" or "as good as possible" to begin with. This also is NOT to say that i agree with all of Dunlavy's points of view, even if i do acknowledge his vast level of experience and education. There are reasons why both men are well respected in their fields.

There is one thing that i do agree with in your post though. Individual Zobel networks for each driver is a FAR superior design than trying to use a Zobel for the whole system. I have never seen anybody try to do an "all in one" network though, although i'm sure that someone has attempted it. Sean
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Sean, I appreciate your backing me up on Zobels. In terms of my description of John Dunlavy, I want to state that I DO think he is an electrical genius! I just don't think he (or anybody for that matter) is an ABSOLUTE electrical genius. Is there anybody on this planet that knows everything?

It has been my experience that many highly respected designers of ultra high end loudspeakers, amplification and digital can miss something in their overall design execution, which although may be just minor oversights, are oversights none the less.

When we are talking about very expensive products such as $25k+ speakers, $10k+ amplifiers , or $5k+ digital that can be easily improved with inexpensive modifications, I feel that my "dropping the ball" description is very appropriate. A product at these price points should not be easy to improve with minor, inexpensive modifications.

I tried the zobels and in my opinion they worked very well.
first of all clarity and detail are extremely noticeable. before the zobel there was a slight smearing in the treble and the midrange that is virtualy gone now. also i was suprised how much better the bass got very tight and musical. We did one speaker at a time so we could AB there was no doubt the zobeled one was better. One thing to keep in mind if you want to try this. The parts cost very little about $30.00 and if they don't work for you you can just remove them. Once again thank's for all your input!

Out of curiosity, what wattage rating were used on the resistors for the various units ? Did you "zobel" all of the drivers, just the mids or woofers, etc ??? Sean
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