Excursion question

Ben Lawrence

Ben Lawrence

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Mar 2, 2011
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I have a few EV SXA250 speakers. One of them when set at the same level and fed the same input signal bottoms out on the 15" driver. You might have heard it before the ugly "snapping" sound. I pulled the grill and gave a quick push on the driver it doesnt seem to be rubbing or anything. What exactly is worn out? Does it just need a recone? At lower volumes it plays fine but at some point is extending further than its identical bredren.
 
Re: Excursion question

Just a wild hair here:

You might check the DC resistance of the suspect driver to see if it's possibly 1/2 the nominal resistance of the other drivers?
 
Re: Excursion question

EV had a bad batch of glue used on spiders some years back. I had the spider start detaching on several EVX-180B drivers. If it was caught early enough, a re-glue would fix it up. Otherwise it was recone time with better glue.
 
Re: Excursion question

Silas Pradetto said:
It would sound dramatically different if that were the case, right?
Click to expand...
According to the OP, the driver in question does sound dramatically different (some kind of horrible sound like the former smashing into the bottom of the magnet structure)... right? unless I'm missing something. Admittedly, some of us might be able to perceive the 3dB difference in response between a 4 ohm and 8 ohm wound driver... but I'd suspect most of us would sooner detect a driver destroying it'self at the same board push compared to a neighboring speaker that's doing fine at the same relative push level.
 
Re: Excursion question

W. Mark Hellinger said:
According to the OP, the driver in question does sound dramatically different (some kind of horrible sound like the former smashing into the bottom of the magnet structure)... right? unless I'm missing something.
Click to expand...

I was thinking more along the lines of the crossover being one octave off, and the balance between HF and LF way out of wack...
 
Re: Excursion question

Interesting. If the issue is not obvious when I pull the driver I can do a quick swap with another speaker and see if it is crossover related. I did not notice a difference in the audio at lower levels but at the time was trying to get the deployment up and running 100%.
But yes it sounded like the voicecoil bottoming out earlier than it should.
 
Re: Excursion question

If EV had a known "glue issue",, it may be worthwhile letting them know about your experience. They "may" offer some assistance, if that's the case, even if the warranty has expired.
 
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