What caused this...?

Re: What caused this...?

Karl Barnes said:
Hi, it's a Behringer CX2310 (don't judge me...) running 2 way with the crossover set at 120Hz.

I've sent the above pics to Peavey who have replied saying that it's probably dirt in the magnet gap.
I could believe that if it wasn't for the fact that all four cones suffered from the problem at exactly the same time.
Maybe I'm just that unlucky...

To look at the cones, you can't see any damage. No folds, tears, etc.
They are almost pristine, as they are only a couple of years old.
It's only when you take the magnets off that the damage to the coil is visible.
Click to expand...
The FINAL failure may have happened at the same time. It could be that they were all slightly damaged BEFORE the event-and that one event just pushed them over the edge.
 
Re: What caused this...?

Karl Barnes said:
Hi, it's a Behringer CX2310 (don't judge me...) running 2 way with the crossover set at 120Hz.
Click to expand...

Karl, do you have the "low cut" buttons on the inputs lit? Your subwoofer must have a high pass filter to reduce excursion below the tuning frequency, but this crossover only sort of provides one.
 
Re: What caused this...?

I use the X32 for controlling the subs, and with that crossover, there is no safety loss by omitting it, because there is no limiter or anything else protecting your subs.
I suspect you amp has a sensitivity of 0dBu, and the X32 is capable of outputting +22dBu, and the crossover is able to pass a signal at that level so having the amp attenuation set at 75%, my guess is that your setup is capable of overdriving by a voltage factor of 10 or thereabouts. How hot do you run the X32?

I use the compressor/limiter on the X32's Matrix keyed with a lowpass to limit excursion (-24dB threshold, Ratio 100, Knee 5, Peak, Log, 10mS Attack, 10 mS Hold, 151 mS Release, 0 Gain, 100% Mix, Key Filter On, 20Hz, HC6 Slope)
This limits the very low EDM frequencies to -24 dB (that translates to about 600 watts on my system) while frequencies of 80Hz are reaching -12dBFS (10dBu) ( and allowed the full 10KW capability of my system)

There is also a BW24 low cut on the eq after the limiter, set at 24.6 Hz that further reduce any ultra low frequency content.
 
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Re: What caused this...?

Bennett Prescott said:
Karl, do you have the "low cut" buttons on the inputs lit? Your subwoofer must have a high pass filter to reduce excursion below the tuning frequency, but this crossover only sort of provides one.
Click to expand...

Yes, "low cut" was engaged. I'm running the subs out of the sub, which has a separate frequency setting to the main hi/lo crossover. We use the PV215 column for the tops, which is pretty much full range, so the crossover is acting as a way to get the sub frequencies into the sub speakers. Those speakers actually saved the day as by adjusting the crossover to allow 80Hz and higher to go to the tops, they were able to carry some bass. Not as much as I would have liked, but enough to get through the gig. It doesn't look as if that crossover has a HPF on the sub out.
It sounds like that by cheaping out on the crossover, the system has not had adequate protection.
Any practical recommendations as to something that will do the job?


@ Per, I keep the main level in the green and tickling the red. I don't run it full red all night.

Thanks folks. I am learning from this.

Karl.
 
Re: What caused this...?

Karl Barnes said:
@ Per, I keep the main level in the green and tickling the red. I don't run it full red all night.
Click to expand...

OK, that is both good and bad.
It is good because it is the way we all agree we should have it, running a nominal level around -20dBFS.
It is bad because it means you have 20 dB of unchecked headroom unless you add in some limiters.

Lots of crossovers will do a good job of protecting your speakers. The Behringer ULTRADRIVE PRO DCX2496 will do everything and have AES input so you save some conversion. I used to run a DRPA+, but I don't use it with the X32 because I can achieve the same without and have my system sound a lot better.
Running PV215 over subs, there is not that much need for a speaker processor with added safety compared to what the X32 on its own will give you. Use the Matrix to do the processing, even connect to outputs that are not in use with the default/reset configuration if you feel like being extra paranoid, and you're safe if you don't do anything silly.
 
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