There is a crackling noise from the speakers when the receiver is on, at a medium volume level. Speakers B are not longer functioning.The noise is present while playing CD, TUNER, VCR or DVD sources.The speaker connections have been checked.There are 2 front and two rear speakers plus a sub woofer, connected to this unit.Sometimes the display announces OVERLOAD, that is corrected by turning off the unit.What is the cause or source of this crackling noise? Thank you for your time.
The OVERLOAD indicator lights up when the receiver is maxing out on the current it is sending to the speakers. My guess is there is possibly something wrong with the receiver itself, especially since the B speakers won't play. Either that, or something is broken in your speakers or you are using a set of speakers that have too low an impedance rating for your receiver.
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Panasonic SC PT860 Manuals
The above link is the owner's manual - it may help.
Here are some other ideas:
Try to find out if the crackling sound is coming from all speakers or just one - you may just have one bad speaker.
If the crackling happens at high volume settings, you may be overdriving the system - you'll just have to turn it down!
Try turning down the bass or the subwoofer level.
Is the crackling present with all sources (TV, cable, DVD, bluetooth)?
I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.
My recommendation is to check the sound quality of the audio from the RCA L/R audio outs on rear of the piano by connecting to a stereo receiver. If it sounds fine you're in luck. If the crackling sound does not diminish after a few minutes like mine does, I would suggest disconnecting the internal speakers and using the audio out only. You can connect a pair of studio monitors or high quality computer speakers, preferably with a small subwoofer to deliver the full audio range and deeper tone of a real piano. I'm currently using a basic pair of Logitech computer speakers and is quite acceptable until I can afford a high quality set of monitors or relocate my piano closer to my high quality Yamaha receiver.
Is this a NEW problem or has it always been like this? What modes or sources are affected? Generally, crackling, scratchty sound is either overdrive distortion, speakers being pushed too hard, or blown speakers.
What is the exact model. Can't find the manual for "517v".
Ahh, that channel is blown. Its not 100% blown. This has happened to my freind before, and from my long knowlage in audio, the channel is blown, and is not fixable. If you REALLY are attached to it, you could probably bring it to a shop that fixes receivers, but best bet is to let it go
The horn speaker is wearing out. Inside speakers, there is a magnet, the speaker part is attached to a cone that slides over the magnet, They tend to make crackling noises. Try very gently to apply pressure to the horn and then release. If you hear a scratching sound, the horn will need to be replaced
Would check your balance settings. Make sure your not balanced more to left than right. Next i would try to swap over one of the speakers from right side to left to see if it crackles. If not replace left side speakers.
Generally, crackling noises come from anyplace there is a mechancial connection for the sound signal. The volume control, main/remote speaker switch and possibly the headphone jack. That is where the contacts must be cleaned, but it requires dissassembly. Try operating the main/remote speaker switches, and plug/unplug a headphone several times. I am assuming there is still audio behind that crackling. Are you using both main and remote speakers simultaneously?