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JBL SRX815P

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Jim Babo:
Hello everyone, new here and being DJing for a couple of years. I used a brand new pair of JBL SRX815Ps for a gig last Saturday and I ran them pretty good for 8 hours. About five hours into it I was getting LIMIT flash on the LCD and I smelled a funny smell, electronic. As I brought the volume down, limit would go off and no more smell. Speakers are working fine but I am a little worried about the smell and limit light. I also set the speaker main volume to 0, didn't want to touch it. Should lit be set higher than that? I used a Behringer 18 in powered sub but left the SRX setting to preset main. The manuals are not much help with these questions and hope to get some input from the pros. Thank you

Jim

Chris Grimshaw:
Hi Jim,

New speakers do smell sometimes as the glue around the voice coils gets warm. Not something I have a lot of experience with, but others around here might. The smell might also have been something in the amplifier itself, in which case that's cause for concern.
A flashing limit light means you're not going to get any more volume out of these boxes. Limiters are there to make sure nothing breaks, so the indicator is telling you it's doing it's job. Occasionally touching the limiters is fine, but if the light's on more than that, you need a bigger system.

If you set the SRX815P for use with a subwoofer, you'll get considerably more headroom as the 15" driver won't be flapping around trying to do bass. Hope the Behringer sub can keep up...

Chris

Johannes Halvorsen:



--- Quote from: Chris Grimshaw on March 17, 2018, 05:33:20 AM --- Hope the Behringer sub can keep up...


--- End quote ---

I have never used any of those speakers myself, but I'd guess you could turn the Behringer sub on or off and not notice much difference when the JBL is running full tilt boogie in full range mode.

Seems like a quite odd combination of speakers...

But to adress the OP: Have you tested the speakers afterward? Any strange sounds etc? In my experience it is easier to check if a speaker sounds ok when using a recording of a single instrument. Some old audio test CDs (e.g. Parson/Court) have nice clean recordings of uncompressed guitar, piano, human voice, etc.

Mike Pyle:

--- Quote from: Jim Babo on March 16, 2018, 09:59:20 PM ---... I used a Behringer 18 in powered sub but left the SRX setting to preset main.

--- End quote ---

If you are running the tops full range over subs it is possible that they cancel each other out at some bass frequencies. That can lead to burnt voice coils from DJs driving the system into limiting trying to get higher bass levels.

Don T. Williams:
+1 for the suggestions about running the SRX in a mode set for use with a subwoofer.  In the "main" full range mode it is possible that the JBL and Behringer products are out of phase at most frequencies, and you will get less bass. 

The easy way to tell is to set them each where they are about the same level on bass program material. Better yet, use a bass test CD (or a frequency generator if you have one) sending 40Hz - 80 Hz material to both units independently.  Then run them together with the JBL's (set for main) and turn off the sub.  If the bass is stronger, they are substantially in phase, if weaker they are substantially out of phase.  If you have a way to invert the polarity of the signal to the subs, try it again and listen for the results.  If there is no difference, then the phase relationships are somewhere in between.  It's still best to set the JBL for use as a top cabinet only.   

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