So as the heading states whenever I turn off or change the speed of the fan (only one fan from where the electrical connection to the setup is provided) i hear a click/crackle sound thru my speakers.
setup
Mains --> APC BR1000 UPS --> Sound foundations POWERBASE power filter and protection unit --> AudioNote OTO PP --> AudioNote AZ3 spkrs
What I have tried (both with 3 & 2 pin power cords for AMP):
1. No music played, turn the fan on/off ----> Result: click/crackle sound
2. No music played mains switch off, now receiving power from UPS battery, turn the fan on/off ----> Result: click/crackle sound
3. No music played mains switch off and unplugged, now receiving power from UPS battery, turn the fan on/off ----> Result: NO click/crackle sound
Any suggestions on how to detect and eliminate the cause of the click/crackle noise
setup
Mains --> APC BR1000 UPS --> Sound foundations POWERBASE power filter and protection unit --> AudioNote OTO PP --> AudioNote AZ3 spkrs
What I have tried (both with 3 & 2 pin power cords for AMP):
1. No music played, turn the fan on/off ----> Result: click/crackle sound
2. No music played mains switch off, now receiving power from UPS battery, turn the fan on/off ----> Result: click/crackle sound
3. No music played mains switch off and unplugged, now receiving power from UPS battery, turn the fan on/off ----> Result: NO click/crackle sound
Any suggestions on how to detect and eliminate the cause of the click/crackle noise