Originally Posted by rahula7
Erich, I don't think there is any damage to the diaphragm. I can post pictures of the diaphragm and insides. I have opened CDs before and know how to put them back. If you can link to some other measurements of the DNA360 on even a SEOS-12, it would be great. Even in my first measurement of the DNA360 just after I received it, it looked different to a DE250 on a SEOS-12 horn. I just never made a big deal out of it. I've been using it for over a year now. It works just fine on a SEOS-12.
I'm not trying to knock on your product. I don't want this thread to be about that. I want it to be about drivers that can be successfully used with the SEOS-18. I know that 800 Hz is pretty low for these all these drivers. A few db here and there doesn't really make a big difference.
A few db here and there does make a difference when they're run at 800hz or lower. It's like any other component you experiment with. If you push a woofer to see what it can do and it bottoms out for hours and you hear the straining, there will be damage. At that point it's not really fair to test it against other brand new woofers and wonder why it doesn't test good anymore.
It's been bottomed out to the point of failure.
Your 360 has definitely been damaged, the charts show it. When I did testing on the prototypes, I purposely ran some with smaller and smaller caps until failure. Testing them showed what you just posted. Experimenting and straining a 1" compression driver playing that low will distort the diaphragm on any of those models, not just the 360. You probably wouldn't be able to see it by just looking, but running it for long enough like that will distort them until they eventually fry.
Hopefully you don't really think the 360's test like.
Hundreds have been ordered and there's measurements of them everywhere. They're at least as good as the DE250 and have very low distortion. Keep in mind, any of those models you have will fail if you run them for any extended time at those lower frequencies. Rack it up as a learning experience, but you should let people know that in your tests because right now you're showing tests from an over-driven driver.
Just curious, why did you think those DE250's, 4550's, or 360's could work that low? Their manufactures all recommend a crossover no lower than 1000hz with a steep crossover. Just because a big horn boosts that low end, doesn't mean the driver will be safe running lower. It was discussed many times that 950hz could possibly be done, but not paired with the volume your big woofer would be putting out.
You need something like this:
Because you were just experimenting, you can send me the driver and I will replace the diaphragms for you. Just don't go crazy like that again.