Programming Behringer DCX 2496 Limiter

[mjkelly]

Im having a problem finding a guide in laymans terms for how to properly set my limiter for my tuba 30s. I think i have everything i need to properly set the value but im having a hard time following these directions. I'll explain our set up first and maybe someone who knows more than I can offer some advice.

We've got 4 JBL full range cabs and then 2 tuba 30 subs, with Eminence Kappalite 3012HO Neo 12" Speaker Drivers, powered off a crest audio 8001 professional audio 2 channel amp. We have the DCX set up on LMH LMH and then we're using the 2+1sub recall setting. Then we've got the output for output 3 from the DCX going to channel A on the amp and the output for output 4 on the DCX going to channel B on the amp. Then we have all of the JBLs coming off channel A and the tuba 30s wired in series on channel B. So we let the JBLs do their full range and then have the 2 tubas on a subwoofer output on the DCX. All in all it sounds good.

If anyone has advice on that set up im all ears but what i really need to do is set the limiter properly on output 4 for the tubas. Right now i have them turned down alot because im afraid of frying them. I have a voltmeter here to set the limiter properly but i need someone to gimme a hand walking me through this. Can someone help me out getting this limiter programmed right so i dont have to worry about frying subs?

Here is a link to the amp too btw: http://www.manualslib.com/manual/380676 ... -8001.html

Thanks

[doncolga]

Don't know if this may be of any use to your or not. I posted this a while back.

http://www.youtube.com/watch?v=LIZg_Iwd ... H4lNzsAM5Q

[Grant Bunter]

I'm a bit confused.

First up, I hope the drivers in your T30's are 3012LF's, not 3012HO's

Are you currently running 2 x Tuba 30's, but plan to build 2 more to go to four?
Can you tell us why are you running the T30's in series?

And why are you running the JBL's full range when you're running subs?

Just trying to understand.

Do you have a Digital multi meter and a tone generator?
You need both these to set the limiter...

[mjkelly]

Yes they are the LF's, my mistake.

No. Just the 2 tuba 30s. Im not sure why i am running them in series. Maybe i used the wrong word.

I have the JBLs on full range right now because i have the subs limited way more than they should be out of fear of frying them.

Yes i do have a digital multimeter but i dont know what a tone generator is. Ill look into that. I read about using the multimeter but i couldnt seem to understand exactly how to use it to set the limiter properly.

Doncolga thats an awesome video. Im watching it right now.

[Grant Bunter]

Ok, things are clearer now.

What did you use to generate a tone (ie 30Hz) to break your drivers in?

[MissileCrisis]

My guess is you mean parallel, one daisy chained to the other is parallel unless you made custom cables and If you did that you would know. Look up the voltage limit(guessing 50) and with the subs not attached and a sine wave, preferably 60 hz playing from a computer adjust the limiter channel on the dcx
Output channel (sub) until it clamps at or below the limit. Your amp should be at full gain (turned up to max) for the test.
Its much easier to explain in person. Best of luck.

[mjkelly]

OK yeah i meant parallel then sorry.

OK im going to go give it a shot. I couldnt find the voltage limit anywhere actually. Am i missing it? http://www.eminence.com/pdf/Kappalite_3012LF.pdf Ill set it at 50.

[mjkelly]

OK so i turned up the amp all the way and checked the voltage and it was 87 volts. So i adjusted the limiter -18.4db so the voltage maxed out at 48v.

Then i tested it a few different ways and it looked like it was working fine. No matter how much i pushed it from the mixer gain and the amp together, it limited the voltage to 48v.

So thanks for the simplified explanation. It was great.

Anyone know if these kappalite's are maxed at 50 volts? Still havent been able to find anything saying 50 volts.

[Grant Bunter]

In your plans under the heading "protecting your drivers", it will give you the voltage limit for the 3012lf drivers.

Glad you worked the rest out...

[Tom Smit]

The reason for the "50" volts is so that your driver will continue to work rather than overheat quickly or overextend. A margin of a few volts is built into that number as well. Adhere to that and you should never, ever blow a driver.

[doncolga]

FWIW, I don't think I've ever had any of mine past 40 volts outside. At that point it was pretty loud....especially as you add more cabs.

[mjkelly]

Awesome. Glad to hear i have it all set up right.

Thanks again guys for all the advice. THese forums are fantastic.