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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: The driver choose is always a quandaryPosted by Romy the Cat on: 10/23/2010
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 el`Ol wrote:
Romy, are you going to verify the decision of using fragile vintage drivers?
E.g. by trying JBL midbass drivers?
They would be closer to the design philosophy of the Fane Studio 8M.
http://www.jblpro.com/components/maxout.htm#2020H

The driver chooses is a quandary and it is always a question if the driver used is the ultimate driver to use. There is however a catch. For MF drivers it is easy to swap them in a MF horns with very limited adjustments of easy change a horn for different driver. With Midbass horn, as it might be seen from my experiments, the performance of the channel is greatly depends from how the drivers is used in the horn. I am not one of those who stick a random driver in a random loading configuration and then make conclusions about sound. I think to make my midbass horn to sound properly in context of my playback is a good month-long work. If I change a drive it would be another month to optimize and balance the things.

I admit that JBL 2020 looks very good on paper and might be a fine candidate for a horn like mine. In futures, what the sound I am getting in my room stop to be novelty and if I have any dissatisfaction with Sound then I might try other driver in midbass, the JBL 2020 will be fine and I have some others in my mind. That is why I made the mounting pate of the back chamber interchangeable. It will be however some work to do the experiment properly and I need to have motivation to do it, at this point I have no motivation and no matured expertise to assess the result properly.

Regarding the JBL 2020 specifically.  It might be a bit too tight for my horn. The 2020 has resonant frequency 60Hz that is a bit too high for my 42Hz horn. I would like a driver to have some LF “reserve” at the bottom and 2020 would not have in my type of horn. But you never know. It is absolutely impossible to predict how a driver will behave being loaded…

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