Almost all subs have a "plate amp" with a switching power supply and are very prone to this type of problem. Check with Tannoy and see if they have an exchange program where they send you a rebuilt plate amp, which you can change out yourself. If not, some repair shops will work on the removed plate amp, saving a lot of shipping cost. Also if you remove it, sometimes it is easy to spot a split cap.
60 Hz Hum from Powered Sub
Hi All-=
I have an older (late 90's?) Tannoy PS110 powered subwoofer. It has a 3-prong (grounded) permanently connected power cable. Over the last month it has developed a 60 Hz hum. I've plugged it in different locations in the house to rule out ground loop. The hum is present whether there is an audio source connected or not. Is it time to just move on or is this something worth repairing? Could this be something simple, and if so, how can I diagnose it? Any suggestions are appreciated!
Thanks,
G
I have an older (late 90's?) Tannoy PS110 powered subwoofer. It has a 3-prong (grounded) permanently connected power cable. Over the last month it has developed a 60 Hz hum. I've plugged it in different locations in the house to rule out ground loop. The hum is present whether there is an audio source connected or not. Is it time to just move on or is this something worth repairing? Could this be something simple, and if so, how can I diagnose it? Any suggestions are appreciated!
Thanks,
G
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- 29 posts total
Are you using the low or high level inputs to the sub? If you're using the low, it's probably a bad cap in the subwoofer. You might just try the high level inputs if you have them. I know that cured the hum in my older Sunfire sub years ago. I replaced all big electrolytic caps and it still hummed, no matter what I did. This just might work? It would be a temporary cure until you either upgrade to a newer and better sub, or decide to send it in for repair. Good luck. |
Power your sub from the mains plug which is also connected to your other devices. Basically, all the earth potentials of all the devices must be on the exact same potential. If there is even a few millivolts difference, you will get the dreaded hum. Every device must be on a STAR connection, meaning plug everything into the SAME mains outlet with the shortest possible power cables. |
spacecadet65 said: 08-30-2021 9:13am The hum is present whether there is an audio source connected or not. |
Funny, I was using my sub's Line Input/LFE connection via RCA cable from my loop out right/left connections on my power amplifier and all was well. Now using the high level speaker input connection with the amps plug adaptor off my speaker terminals and I get the 60Hz hum. Need to mess around with it more, but why would the power amp to the LFE be fine, but not the high level speaker terminals (producing hum)? |
- 29 posts total