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Sony is not a bad brand if you use it correctly... This is what is happening my friend. You are what is called "clipping" your amplifier. What you need to do is make sure you are running your subs at the correct impedance or also known as resistance. Then make sure you are running them at the correct frequency, there is a turn tab on the amp to match the sub to the amp. Then never never turn the gain all the way up. This over works the amp and will wear it out much faster. This also does not actually give more power to the subs it just gains the power sooner then later. Never turn the gain more then half way up.. Hope this can step you in the correct direction my friend.
for seeing a out of phaze speaker you would have to run like a 10 hz or lower signal to the amp you might be seeing a optical illusion if they were out of phaze or backwards the speaker would have cancled each other out so it would sound like **** as you said.but anyway it sounds like the amps power supply is bad.put it back in you car and see if it still works like it did befor you put it in your friends car.you may have burned it up.find out how much the amp is worth and if can have it fixed for less then 60% of orignal cost then have it fixed
DID THIS JUST HAPPEN ALL AT ONCE ? OR DID IT GRADUALLY HAPPEN? CHECK GROUND FROM AMP , INSTALL ONE FARAD CAP . STOCK RADIO ISNT REALLY HELPING , MOST AMPS OF TODAY TAKE A HIGHER SIGNAL FROM HEAD UNIT . ADD ONE FARAD CAP AND SEE
Its not pulsing, its called clipping. The sound is being clipped due the amp being pushed past is power capacity and distorting the signal. This will damage your speakers very quickly. No amp should be turned more then 3/4 up. If its not loud enough you need to purchase a larger amp or be comfortable with the wattage it produces at 3/4 volume. You may also have speaker wires touching/crossed causing th issue.
This indicates a possibility of a power supply issue, you may have to open up the unit and take voltage measurements to determine if the voltages are correct. In order to do this you will need a schematic diagram of the unit. Once you have the schematic you will be abor to tell which voltages are legitimate. I hope this helps