2 LG Clone, 4 UXL-18 (Pi-18).......... - Page 13

The detailed scientific answer is...Careless use of a 12,000 watt amplifier, on a 240v 50A ac line, strapped to a single woofer = DEAD woofer.



Yep.

[quote="Ricci"]
Careless use of a 12,000 watt amplifier, on a 240v 50A ac line, strapped to a single woofer /QUOTE]

I'm not defending anyone or a fanboy of anything; but simply from an unbiased perspective, I understand the response of "well, if you think you can do it, you try it" mentality.
One of the most selfish and ignorant, yet most common, mindsets that people have is their expectations of others to accomplish more than themselves.
If you can't do any better, don't complain and if you complain, you better be ready to prove you can do better.
This is the philosophy that I live by and I don't expect other people to agree or even understand. I just wanted to express what I feel is the sentiment of your quoted paraphrase.

In terms of fixing the existing issues at hand, I agree in that it's a completely useless sentiment to express, especially for a business.
Customers want to know that an action plan is in place to fix the issues, not a runaround because there most likely is none.

Yes, I agree, it was not the right response to take. I have nothing else to say on that.

After evaluating the whole situation and viewing the dead unit that arrived to me, I've formed the following conclusions, many of course, I already knew:
- The UXL-18 is rated for 1200 watts RMS. It will handle this power without issue
- What happened to this driver, while a mistake, goes well beyond what it is rated for
- Mach 5 Audio/Innovative Sound stands behind its products and warranty obligations
- Had nothing been said about the power output applied, I still would have known the driver's death was still the result of abuse regardless

I must say, I'm surprised how well it withstood against such extreme conditions. I was honestly expecting to see the driver show up in pieces. In fact, the driver stayed together perfectly, minus the dust cap. The failure was thermal/over excursion, which is no surprise, considering the output that was applied.

If anything, this confirms that the UXL-18 does indeed have a limit, and it is most certainly below 8kw at less than 10Hz. It almost makes me wonder how it would have held up with the same power but at a higher frequency

And to those who are thinking, no, I do not have 8kw of power available for testing

Best,
Mark

Oh, and just to add, the coil failed because it was jumping out of the gap and was hitting the edge of pole - 55+mm!

i'm kind of surprised how little distinction is made between "real watts" and watts based the impedance swing. nate probably cooked his drivers because at tuning in a ported sub, impedance hits a minimum, and "real watts" go into the sub, even though excursion is minimized at that point, which also minimizes air cooling--kind of like turning on a hair dryer and then putting your hand over the intake. it will either blow up or thermally shut down. this driver could probably survive 12,000 watts in the test enclosure up around 40hz, as at that point impedance is near a maximum, so actual watts are closer to 1,200 and cone excursion is just a hair over xmax, which would be providing lots of cooling. apply the same voltage at 10hz and power is closer to 12,000 because impedance is low down there and excursion, well, goes off the charts.

Any updates?

Greg, the wife and I will be taking the RV for a two week cruise around the US in July. If I can get the drivers done before we leave I can deliver them to you. All you need to do is pay for our gas to get them there.

Don't worry, the RV gets a whopping 8 miles per gallon.

get on it!

Trust me bro, if you think 2 subs are good 4 of them will blow your mind!

If you think 4 subs are good, you should try 8 (which Eric will soon be doing, cause I'm telling him he has to lol)

Do you have any of your subs fully functional now?

Ooooo!! Exciting!

I am not going to come out there to take a look at that projector unless you get 4 18's going.
I am seriously interested in these drivers, I was waiting to see how the packaging and delivery panned out and then they were gone. Year long waits are a no go for me and I can't fit those 21" in my room.

Some people dont have to wait a year..............

Hang in there bud, they are on the way. I really wish I could have gotten them there faster.

No prob.....wish I told you to send me another pair before they shipped.

Sam at Affordable is receiving a small quantity of them. Touch base with him if you are interested in getting more.

You and Carp have got the worst luck with your electronics, geez now the projector is acting up!

Using a dynamic iris is a personal choice. The content is not created on a system utilizing one and it does change the image. There are large differences between companies implementation of them as well. I want to check out DD's IB also, although I am afraid your guys systems will put me over the edge on the DIY front!

Dynamic Iris....*shudders*

the auto iris on my epson drives me nuts, not only can you hear it- but it's quite noticeable in the picture when it adjusts too.