GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: JBL 2490 mid-range driver

Post Subject: Thoughts about the 2490 testingPosted by Romy the Cat on: 1/1/2011

Romy the Cat wrote:
I plug it for a first time today. It looks like it is sensitive like hell and I did not hear any titanium problems on it even without low pass filter. I do not have infrastructure now to look into it further.

I will probably put my experiment with 2490 on hold. The infrastructure that I meant above is the environment in which the 2490 can be objectively evaluated. I do not have it now. The ability of a driver to provide saturated tonal reaction to very minor current irritations is a very fine characteristic. I would not excaudate if I say that 95% of audio people out do not understand the concept and even higher percentage of them do not know how to test the driver for this quality. To do it properly I need a fully broken in driver, for this type of suspension it might take a long time. Also, I need a good electricity to get colors. The dams PP2000 is still not fixed and the next fight with Purepower it looks like to get my colors back. The PP2000 that I have at my disposal now are eating all fine tonal ensignations that render my playback to nothing that was proud before. Not the last thing is that I need to have an adapter made from 3” driver to entrance of my Multicell. The adapter will be a bit complex and I would like to have buffering front chamber and perhaps eventually strip down the driver from it’s phase plug. I did not open the driver yet and I do not know how it is made. I do not have my own driver and use a borrowed for now, so I do not want to open up somebody else driver. Then - the making of the adapter. I have wood, glue and the table saw to do it myself but I am kind of get spoiled with my former carpenter. I feel it is easy to form the task, go to work, return and to have the things done. Instead of cutting the wood and making the things myself I would like to pay it off and to get it ready. I was not thrilled how my carpenter behaved in the end, so I would like do not employ him again. I would feel better if I find another guy, as I have some other ideas that I need to render.

So, I will put the things on hold: will talk to different handy men, will trying to get sound out of Pure Power… When all things “click” I will pit the 2490 for test and will see if I will work with Macondo. The alternative option would be to use 2490, it is can sound OK, with 180Hz multi-cell with my Ledom Cetla 91 loudspeker. If I get the 200-1000Hz from 2490, than I know how I will convert the Altec 19 into a very nice sounding machine and it will be relatively easy.

The Cat

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