Eventually I got curious and plugged it into an amp. Turns out it's passive after all, and will run off an amp. Doesn't have a built in crossover etc though, so you'll need to find some way to filter the signal first.
As far as I can tell, the extra cable is just attached to the switch on the front. So it's only really a circuit breaker, so make it look like a powered sub. very sneaky!
oh, and I'm pretty sure that's the label on the back. I'm not at home right now, so I can't check.
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1. Check audio wiring.
2. Check subwoofer power cable.
3. If you have any way to substitute for the subwoofer this can confirm wiring.
4. The crossover in the amp may not be working, sending no low range to the subwoofer.
So, you don't have a powered Velodyne sub (with a built in amp?)
Without model numbers - I"ll guess that there are speaker in and out connections on the back of the sub.
You simply connect the left and right speaker wires from the receivers to the subwoofers input speaker wire connections.
Then connect your main speakers from the sub's Out (or "speaker"} connections so that the sub is in line with the speaker path.
Use the sub's crossover settings on the back till you hca a seamless blend of the sub to the speakers where it is hard to tell you have a sub other than you your music now has deeper bass.
Why do you need the Kenwood EQ? This is not a necessary piece as nobody really knows how to use it properly and it realy complicates how you use your system. Flashing lights look cool though, right?
If you really must complicate the operation of your system then connect the Tape output of your receiver to the tape input of the Kenwood EQ, Then connect the Tape output of the Kenwood EQ to the Tape input of your receiver - assuming your receiver even has tape ins and outs.
You can engage the Kenwood EQ by inserting it into the audio path when you select the appropriate Tape input as the source on your receiver.
Before you go throwing money at this problem, try to eliminate any external influences like track lighting. I myself am trying to figure out why mine makes a buzz throughout my system when the lights are on. I already replaced the variable light control with no improvement.
Bad cable ground can let airborne electronic noise into the Sub's amp.
About a year and a half after I purchased mine, one of the subs quit working. Still under warranty, boxed it up in the original container and took it back to Ultimate Electronics. They then had to ship it to Tulsa for the repair. About a year after that the other speaker sub went out.....same thing....still under warranty. Now that the warranty is gone? I'd probably take them there myself...it's just a couple of hours away. The name of the repair shop is Fast Trak Service Center.......918-254-4885 Hope this helps.......
It sounds like you may have some basic interference either in your power, or other sources. I have something similar when my sub is not in use I pick up talk radio, it drove me in sane for months untill I figured it out.
There are a few things you can do to help eliminateinterference would be to purchase a surge protector with a power "filter" or conditioner. Also check the cabling to your sub-woofer if there are any breaks or weak spots in the insulation this could be causing interference as well.
And as always if possible read through your owners manual to see if there are any adjustments that can be made on your sub-woofer it self.