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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What exactly do you mean by "middle volume settings"? Where is the volume control physically, where are the channel levels set and what is the crossover point? After the crackling appears , do you switch speakers to the right channel to see if speakers are actually damaged or if the receiver is producing the distortion?
It seems you needs more power to maintain the level of good sound.Maybe the maximum volume is 30 - then the mininum is 15 and you can't hear any cracking sound. If you exceed 15 the minimum, as you said starting 17 - 20 you hear crackling sound .Then you reach ,what they called the "cliping level"so much distortion and crackling sound,your stereo too small to accomodate .You must add a power amplifier so crackling will gone and to fit your listening pressure...
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.
Sony has protection in these receivers for two main reasons.
1 - Checking for DC voltages on the outputs to speakers. Not your particular problem.
2 - Excessive current being drawn from receiver on one or more of the speakers.
Number 2 should be your starting point in finding a solution. Put the volume level on Medium - 35 to 40 on the front panel. Now listen to all you speakers in turn. Any scratching noise will indicate a defective speaker. Remove this speaker from the receiver output and check again if the set goes into protection on high volume.
If you could not find any strange noises on the speakers, remove them one by one and test the set on high volume.
Never - attempt to disengage the protection on this amplifier. The only times we have found the amplifier to be defective with this protection error, it has done so no matter the volume level. Therefore I believe your problem to be a speaker or speakers.
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
A quick way to check your speakers is to put the contacts from a 9 volt battery to the positive and negative speaker wires (briefly). You should hear a crackle of some sort if the speakers are functioning. If there is no crackle, speakers are bad / if there is a crackle, your head unit must have a problem.
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?
right click the speaker icon at the bottom right.
click 'sounds', then 'playback'.
double click 'realtek speakers'.
click 'levels', then at the bottom there is a slider saying 'internal subwoofer'.
slide this to 0.
click 'ok', then close all the windows.
The internal subwoofer is off, (but can be turned on again if you want), so the crackling should have stopped.
It worked for me...