Seems like it is about 60-70% of the time when the keyboard is being played that it pops through the system. our keyboard is a ydp-223. nothing else hooked up to the sound system does this. So I was thinking that maybe there was something to change with the keyboard. It happens most of the time when the pedals are being used, but not everytime. It will pop one measure then it wont till several measures more into the song. Then there are sometimes it does not do it through the whole song. Would like some suggestions if you know. This is used in church services every week.
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I had the exact problem, mine was a YPG 535 brand new in box I put everything together with stand and FC4 pedal. When i got ready to play just a blue screen and none of the red lights came on and no sound, I notice when i was messing with the on and standby button hopeing it would work the speakers would make a popping noise I personly thought it was a manufacturing defect.....i'm sending it back to have it replace. I never had problems with yamaha products but seems like more and more defects are happing with newer portable grand series!
Is this on mains or battery? This keyboard must be nearly 20 years old, it's done well! If you have batteries in but are using mains power, the power adaptor could have failed and not enough juice left in batteries to work. Try new batteries and try without any.
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.
When you drive a speaker too hard the voice coil is driven beyond the linear range of movement and the speaker will "pop" as it hit the end range.
Compare to an identical unit. This problem is common when one gets too small a unit and tries to get too much out of it.
The dirty setting of the amp flatops the signal and drastically worsens the problem.
People buy a 15 watt amp and expect it to sound like a 200 watt and it just doesn't happen. You have not given us the model number so this is my best guess.
If your unit has a 12 or 15 inch speaker, it should NOT pop unless you really overdrive it. It is very hard on both the amp and the speaker to have the popping condition. I won't get into the technical reasons at this time.