I have a pretty basic setup consisting of Yamaha 473 which is connected to an Astonia subwoofer. It's a local subwoofer which is around 3 years old and have performed well for me. Source is WDTV, Raspberry Pi and Pana blu ray. Since a few days, I am experiencing a strange issue.
The subwoofer vibrates every 9-10 seconds! It's as if listening to someone's heart beats although at a very slow interval. The vibration is extremely low but audible when it's completely silent. Otherwise one has to feel the speaker vibrate to listen to it. The reason why it's strange is because I am not able to figure out why it's doing so!
Here's what I have tried
1. Tried removing the signal cable and the hum stops.
2. This means that technically the issue is with the signal but the AVR is off and even disconnected from the power source!
3. The Tata Sky box is powered on and is on standby. If this is switched off the hum disappears. But the other strange thing is that this box is not connected to the AVR by HDMI but by an optical cable. Removing this cable is not making any difference!
4. Tried switching the power sources (different plug points but same board) but it's not helping.
5. Can it be the power source? But nothings changed.
6. One strange coincidence which happened at the very strange time when this is ongoing is the AVRs USB slot. I used the USB slot to power my RPI and it used to work quite well. Since that day the USB slot is not able to power my RPI!
Need some help as I am not able to figure out where the problem lies. It cannot be the AVR as the hum appears even when its off and unplugged. The tata sky box is not connected to the AVR but switching it off seems to stop the hum.
Have switched off the sub as I don't want to cause any damage to it or my AVR.
The subwoofer vibrates every 9-10 seconds! It's as if listening to someone's heart beats although at a very slow interval. The vibration is extremely low but audible when it's completely silent. Otherwise one has to feel the speaker vibrate to listen to it. The reason why it's strange is because I am not able to figure out why it's doing so!
Here's what I have tried
1. Tried removing the signal cable and the hum stops.
2. This means that technically the issue is with the signal but the AVR is off and even disconnected from the power source!
3. The Tata Sky box is powered on and is on standby. If this is switched off the hum disappears. But the other strange thing is that this box is not connected to the AVR by HDMI but by an optical cable. Removing this cable is not making any difference!
4. Tried switching the power sources (different plug points but same board) but it's not helping.
5. Can it be the power source? But nothings changed.
6. One strange coincidence which happened at the very strange time when this is ongoing is the AVRs USB slot. I used the USB slot to power my RPI and it used to work quite well. Since that day the USB slot is not able to power my RPI!
Need some help as I am not able to figure out where the problem lies. It cannot be the AVR as the hum appears even when its off and unplugged. The tata sky box is not connected to the AVR but switching it off seems to stop the hum.
Have switched off the sub as I don't want to cause any damage to it or my AVR.
