Has low volume and clicking noise.

It sounds like you may have ripped the passive (the rubber material around the speaker that stretches when the speaker hits. If the passive is not ripped then it may be picking up static, or it could be blown. You can purchase a noise filter fairly cheap and try that.

The amp is clipping.. witch could mean there is a bad or lose ground, or wire are lose on speaker or worst you voice coil is melted.
good luck home this helps

I opened mine by pulling off the back cover, it is clicked in. then I removed the six screws that appear. Then you can press out the front

The volume control pot can be replaced.

Any good quality audio shop or electronics repair shop should be able to fix this.

I have the same issue. It is a manufacturing fault. The fix with mine was to fold up a gum wrapper and place it over the camera flash, and re-fit the back cover. It may take some fiddling around as too much pressure will cause it to go low in volume again. another solution would be to place a dab of glue around the camera flash and let it dry before replacing the back cover. In the end, you just want to applie a slight pressure to the camera lens / flash area. Hope this helps

Check the units main printed circuit board, as well as the power supply, you may find some large capacitors that have become low of faulty, especially if they have an electroststic glue holing them in place as this glue become conductive over time. Check the Capacitance(unless you can see the culprit,it will look like he exploded from top or bottom) and remove any glue from the printed circuit board. Good Luck.

The first thing to do is unplug it, then pull the sub out of the cabinet, then pull the amp out of the cabinet. If you can take out the amp w/o taking out the sub, great. If there are any exposed printed circuit boards, look for dust buildup. Sounds like you've got alot of static energy built up in the internal electronics. If you have to disassemble the casing to get to the circuitry, do so, just do it carefully. Look at the boards. If there's alot of dust, get some printed circuit board cleaner.(pcb) cleaner found at Radio Shack. Then spray off the boards and the subs volume control as well as the crossover control. This will Not hurt any electronics.Re-assemble and test. If you still have noise: Take a careful look at the input side of the amps circuits and traces, if you have a magnafying glass it helps. What your looking for is a bad solder joint. You will see all the little dimples on the boards from soldering at factory. When you look at the solder point, look for a circular ring generally midpoint on the solder or right at board level. This can take some time, however, it's free and it's more than likely the problem. To fix a cold solder joint you need a fine point solder gun, just touch the point that is bad and it will re-seal, then test. Plug n Play. Hopefully it's just dust and you don't have bad solder joints. Velodyne makes an awesome product!, very rarely do I see problems with them. If you need some more help with this, post a comment and we can dig further. Hope this helps

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?

http://www.velodyne.com/products/manuals/DLS.pdf

Replace the thermostat on your Heat pump, get the model number and search the net for a distributer. If that doesn't fix it, you'll have to call another serv tech, it could be that your defrost board is acting up.. Let me know for my info also, I'm curious as to what they find. Also, being a Contractor, I don't charge just to come out, I usually diagnose then tell the homeowner. Find a Contractor that will do this for you, if it's simple to fix yourself, he should only charge you partial serv call..

This is a problem with poor cold soldering at the bootom of the volume pot, what has to be done is slowly seperate the glued seem where both speaker halfs are "glued"LOl... yes glued together,...Use a small flat head screw driver of any sort and work the way around it and it will seperatel and then resolder the volume pots circuit board pins, then use ABS to glue it back together, dont foregt to get the blue LED power light indicator set right before pressing both sides together.... (^_^)