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The power board is burned.If you know how to fix it,Try replacing it by opening the case, look for something that unusual such as burned, overheated, etc.Then replace it with new parts. Or you can find a qualified personnel to fix this problems.
I looked up velodyne acoustics inc, on line. found the info to contact velodyne direct. they were very helpful, and set me up with what i needed to fix my sub.
1. Verify unit is plugged in and power outlet used is active.
2. Is power switch on?
3. Is auto turn on/off set properly?
4. Is unit receiving an input signal from your source?
5. Have all controls on subwoofer (volume, crossover, phase, etc.) been
properly set?
6. If unit has been running at high levels, one of the protection circuits may be engaged.
7. Has the built-in amplifier overheated?
Well there are only a few reasons i can think of that just might be the reason behind said buzzing.
1. It may be connected to another power source ( amplified or powered supply ) or incorrectly connected. It may also be too close to said power supply.Try letting the dog (sub) out on his leash a little Drag out the manual that came with the sub, and check the correct procedure for your type of setup. **People do read manuals still don't they ?**
2.The only other problem i have heard of is port noise in low registers.
Keep the the port area clean, as it may suck up dirt, or even worse,
small children!
3. However, if you're considering placing this subwoofer in a cabinet, I'd
recommend allowing ample breathing room for the heat sink. This can also be done by drilling smaller holes in the cabinet ( 8-12 mm holes - with the owners permission of course) but please do remember to keep the port area clean.
4. The product ie: Velodyne DPS-12 Subwoofer, came with a bad power supply, presuming it is new, check your warranty.
(not very likely - see also scenarios 1, 2 or 3.)
Velodyne has been making subs forever and do it well.
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