humming from definitive technology sub

[OCTOBER49]

I Have An Older Def.tech Sub And When The Light Goes Off, I Get A Low Level Hum. This Happens With No Cables And I Have Moved The Sub To Other Outlets. The Same Thing Happens When The Light Goes Out On The Back. Thanks For Your Help.

[Big Daddy]

Originally Posted by OCTOBER49

I Have An Older Def.tech Sub And When The Light Goes Off, I Get A Low Level Hum. This Happens With No Cables And I Have Moved The Sub To Other Outlets. The Same Thing Happens When The Light Goes Out On The Back. Thanks For Your Help.

The huming could be due to ground hum problem. Check Ground Hum & Ground Loop Isolators thread.

[MobiusStrip]

I wouldn't think it's a grounding problem if the sub isn't hooked up to anything else. Ground loops typically occur between pieces of equipment.

I have the same problem with a Definitive sub: loud hum with nothing hooked up, and my power filter indicates a good ground on the outlet.

The guys at Definitive were quite responsive and even looked at the amp free, but said it wasn't humming for them. But I've hooked up another speaker to the amp and the hum is there, regardless of where I plug it in.

At this point I guess I just have to junk it.

[Billy13]

Originally Posted by MobiusStrip

I wouldn't think it's a grounding problem if the sub isn't hooked up to anything else. Ground loops typically occur between pieces of equipment.

I have the same problem with a Definitive sub: loud hum with nothing hooked up, and my power filter indicates a good ground on the outlet.

The guys at Definitive were quite responsive and even looked at the amp free, but said it wasn't humming for them. But I've hooked up another speaker to the amp and the hum is there, regardless of where I plug it in.

At this point I guess I just have to junk it.