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Kustom KPM7250T mixer made a loud popping noise and lost sound to speakers during gig, but front power lights stayed on. Accessible fuse good. have it at dealer to see if can be repaired but he needs schematic. thanks
Re: Kustom KPM7250T mixer made a loud popping noise and...
Pilot lights mean very little. Either a filter capacitor failed or other part(s) failed. Needs to go to the repair shop. The damage MAY be visible or require test equipment to diagnose.
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The symptoms you described suggest that there may be several possible issues with your Kustom Bluetooth PA speaker. Here are some steps to diagnose the problem:
Check the battery: Ensure that the battery is fully charged or replace it with a new one if needed. If the battery is old or worn out, it may not provide enough power to the speaker, causing the crackling sound.
Check the connections: Make sure that all cables and connections are properly plugged in and secured. Loose connections can cause crackling sounds or no sound at all.
Check the volume: Turn up the volume on both the speaker and the device connected to it (such as a phone or tablet) to see if that resolves the issue. If the volume is too low, it may result in no sound or faint sound.
Test the mic and instrument input: Try connecting a different microphone or instrument to the speaker to see if the problem is with the original mic or instrument. If the new mic or instrument works, then the issue is likely with the original device.
Check the speaker components: If none of the above steps work, there may be an issue with the speaker's components. It's best to bring the speaker to a professional technician or authorized service center for repair.
Hopefully, one of these steps will help you diagnose and resolve the issue with your Kustom Bluetooth PA speaker.
On the back panel there is a section labelled Patch Bay
There are 2 small switches which assign each Power Amp to either Monitor or Main Output.
It would seem you have them both set the same at present. Set one to Monitor and one to Main, and use the corresponding Power Amp outputs direct to speakers.
These are rated peak 600 Watts... your amp should NOT be bigger than 200 Watts RMS per speaker cabinet driving these to prevent burning out the speakers. The pop MAY have driven the speakers to full excursion and temporarily shorted the speaker voice coil. Test the DC resistance of the speaker... if you find it is under about 3.7 ohms you have damaged the speakers and continued use may damage your amplifier.. Often people will unplug a guitar cable causing a loud pop in the PA system and that CAN damage the speakers if the amp is too big.
The MG24/14FX is a mixer only, with no amplifier built-in. It can't drive speakers directly. You'll need powered speakers or separate amps and speakers.
Hopefully you were powering ALL interconnected equipment from the SAME receptacle. People can destroy the input circuit of powered speakers by plugging them into a receptacle at the stage and then powering the mixer from another receptacle... Pro's know to power ALL interconnected equipment from the same source, be it a receptacle or a power conditioner to avoid ground bounce damage to equipment. They carry power from the stage back to the mixer on an extension cord. You may have had a static discharge that blew one side of the balanced input of the speaker. The parts are inexpensive, however the labor to get at the amp is usually not fun. I have the dual 10 powered Kustom's and one gets at the POWER amp via removing the speaker after the grille... HOWEVER that is to get at the power amp. The Preamp is probably the failure and it is right at the input plug area and you can get at that by removing the panel with the plugs and power switch and volume control.
I don't have the schematic. Look for shorted RF bypass caps on one side of the balanced input circuit and possibly a damaged input op amp.
You didn't mention what brand powered mixer you have, HOWEVER MOST powered mixers also have a line level monitor and main output jacks. These are almost always 1/4 inch jacks. In any case you should be using BALANCED lines to the powered speakers using either XLR or TRS connectors on the ends. Please tell us what powered mixer you have so we can give you better answer regarding which connections to use. IF for some reason your mixer does NOT have line level outputs, you can use a high level Direct Box to condition the powered outputs to be sent to the powered speakers..
Also make sure ALL your interconnected equipment is powered by the same receptacle or source to avoid damaging due to ground bounce on utility lines and circuits. This often means running an extension cord from the stage where the powered speakers are along with a snake of the audio cables.
The speakers are 8 ohm so you can probably get near the 400 Watt per side when connected to this mixer. You don't need bridge mode to get this and I would recommend not using it anyway. Whatever you do make sure the speakers don't get disconnected when running at high volumes as you will arc out the amp in the mixer... I know this as I fix them... I have two PMP5000's that I repaired. Lots of work to repair...
The feedback is NOT the fault of the mixer or speakers but instead of something picking up sound from the speakers and sending back to the mixer.
The mic must be well in back of the speakers (say at least 10 feet) to avoid this or you need to use anti-feedback hardware to avoid the problem or highly directional close talking mics. Reverberation off walls can also get back to mics and cause problem. I was able to use a wireless Peavey mic which seemed to disrupt the phase enough to never get into an oscillation even when in front of the speakers.
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