My wife and I operate a part-time mobile DJ business forweddings and parties etc. In 2009 we purchased a starter system that included two JBL jrx 115 powered speakers, and a Yamaha EMX 512 powered mixer. They have operated fine since we've had them until two weeks ago. At the very end of our set, the speakers started to sound extremely muffled. We couldn't fix it by the end of the night. We had another gig at the same location last night. When we started the gig, everything sounded fine. But midway through the night, one of the speakers again sounded muffled, and about 45 minutes later, the other speaker went out too. Normally I'd think it was the speakers, but we have bumped the mixer around too. I'm just not sure if it's the mixer, or did both speakers blow at the same time. Just curious what others' thoughts or troubleshooting ideas are.
SOURCE: JBL JRX115 producing very muffled sound even
The speakers are rated 250 Watts. Driving with 600 Watt amps requires one to be careful of how much the volume is turned up to avoid damage. You MAY have damaged more than just the compression drivers on the horns but the voice coils on the 15 inch speakers as well. Further use could also damage the amplifiers. You did not mention what brand amps and it is possible they have a problem.
You best replace the units with ones rated for the power of the amps as restoring them on short notice for a gig is not practical.
SOURCE: i have 2 x jbl
In spite of your description it is not quite clear of the connections... In general you should limit the number of speakers connected to an amp output to a maximum of two. I am not sure if you might have more than that in your daisy chain. Let's go over another important thing: are ALL of the amps and the mixer (desk?) powered from the SAME receptacle or power conditioning module? If not, make it so even if you have to run extension cords. The ground bounce of building power at venues can destroy your equipment. The brand/model of the amp(s) and the mixer would be useful to analyzing the problem. It is unlikely the failing battery in a guitar would kill one side of the PA. If the amp is overloaded, the thermal cutout may be disabling part of the amp and the system. Also please verify the RMS capability of your amp. You want the power of the amp to NOT exceed the rating of the speakers USE RMS VALUES... not the fakey "program" or "peak" ratings... those are just advertising gimmiks to show my numbers are bigger than yours... we know that game...
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