500X emitting feedback squeaking

Sounds like the output capacitors are breaking down, or you have a faulty pickup causing feedback, this can also be caused by bad cables close to ac power causes hum and distortion.

It sounds like feedback hum. Most likely caused by the settings on your computer. Try adjusting all the sound settings. Especially record settings.

Sounds like it might be feedback from another source or perhaps a loose connection. Try moving the microphone away from power sources or anything that might cause feedback, such as speakers etc.

The Phono section has a very high level of amplification and so the audio input is very sensitive. So a possible faulty/loose grounding of the input can create a HUM which can be due to even a poor shielding of the input from stray AC factors. So you need to check for the these factors that can bring in the hum , you can confirm by isolating the phono circuit and working to the faulty stage.
Also it can be due to a faulty power supply - non filtering in DC- to the phono preamplifier.Finally faulty capacitors in power and feedback circuits can be a reason- check the negative feedback circuit which can be an op-amp with a feedback , check the capcitors here as a higher amplification can also be a reason.- check the preamp IC.

Hi,

In bridge mode the minimum load will be 8 Ohm.
If you are using 4 Ohm speakers, it will mean you will give each side of the amplifier a 2 Ohm load.
Thats to much for this model.

Kind regards,
Gerard

ur sub wont buzz due to bad speaker. either u have a faulty preamp or power amp. yes it can be repaired and will not cost much. if it is loud and annoying, get it repaired. sometimes subs emit low hum when powered up. this is the way the are desinged.

Failed output transistor

You need to take a closer look really, see if anything on the power supply board inside has melted, burned, popped, etc.

have your built-in amp checked for trouble. there should be trouble in the output stage feedback loop. this is something to be done by a repair technician

Could you specify if noise is coming from : - The freezer - The outside back of the refrigerator - The bottom of the refrigerator