Does this happens even when the audio volume knob is set to the minimum level? If yes, once it has in built amplifier, without knowing anything about its circuitry, there is no much to do.
I can open it up and take photographs of the circuit and post it here, will that help?
It is not the speakers, cause is in the amplifier that feeds it/them.
Happens on both ? Is it a recent behavior or were like that since new ?
Ask the manufacturer customer service.
they said something like it is normal.
I think you already have your answer. Unless you:
1) Redesign the amp, or
2) Buy a different speaker
you are going to have to live with this.
Since the loud pop is heard in both channels, it suggests a power supply problem. (Whereas if it were in only one channel, then you could try switching components between them in an effort to track down the problem.)
I imagine it comes from a sudden drop (or jump) in DC volt level when power is shut off. Possibly a capacitor discharging, or reversing its charge, etc. It may go through all stages of the amplifier, or merely the final power output stage. Then to the speakers.
When servicing an old unit some technicians routinely replace capacitors, electrolytic type especially. They're prone to develop problems over the years.
Are you able to check condition of large capacitors in the power supply?
Condition of diodes, etc.? A proper test (in many cases) requires that you disconnect a component from circuitry.
Or else are you able to run the amp from a different power supply?
The manufacturer has already said this is normal operation. There is no “problem” other than, perhaps, a bad design. Checking caps and diodes is a fool’s errand. It most definitely has something to do with capacitance as caps discharge on power-off and voltages throughout the circuit change unconcontrolled.
With no electronics knowledge nor soldering skills, you will end replacing the 'turn-off-noise' with smoke. Abstain to guess.
Ask them to fix it / reveal any recalls / update design / modification / cures ----> https://swanspeakers.com/service/
Last resource; install switches that will turn off the transducers before powering off.
Why do you keep on insisting that with your admitted limited knowledge of electronics that you are going to "fix" this? We've already established that the problem is in the design, not a defective component. Are you going to redesign the amplifier? Maybe you should just buy some ear plugs.
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