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We have a mirage lf-150 powered sub.it lights up red but wont to green.its seems as if it has no signal from low level input.tried another sub and works fine on the rca"s
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Normally the sub woofer is driven by a separate amplifier, unless the main speakers, such as in a pro audio setup have a special LF out set of terminals on the back of the speaker cabinet, in this case there is a hi powered low pass filter, fitted in side the speaker to route the LF energy to a sub woofer. Else you need a line lever LF signal spliter and a power amplifier to connect a sub woofer.
Just touch your fingertip to the input connector on the sub -- similar noise? That would be its amp picking up the hum of the room through your antenna-like body. IF that is the same noise, you need to make sure your input cable is shielded and connected at both ends BEFORE applying power to the electronics at either end.
Be mindful of electronic noise sources such as track lighting, UV lights, motors, TV's, etc, and route the signal and power cables well away from them.
Try reversing the orientation of the AC plug at the sub and see if that helps out.
within the sub amplifier is an electronic amplifier, that is shorted and blown a fuse. This is all internal. If you can dismantle this module, I suggest do so and any electrical/electronic individual will identify the part needed. you could also check on a replacement module-complete.
Your subwoofer probably has both high-power inputs and "normal"low inputs. The first are for receivers, which don't have link-level output for sub, so they are able to take already amplified signal as input. You need to use link-level input of your sub and connect it to subwoofer-output of your receiver. The output is marked as OUTPUT - Subwoofer and is black-color RCA plug (don't confuse with subwoofer INPUT under MULTI CH INPUT). Receiver has only mono output for subwoofer. If your sub has stereo input (white/red RCA plugs), connect just the left channel to the receiver, it will still work. Don't connect anything to the speaker output on the sub, you don't need that.
try using another input device for sound like a differert stereo or an ipod or try using another input channel on the amp such as high level or low level please rate -jeff
The receiver automatic speaker set-up set the sub volume at -12 and since it was not getting any signals from the receiver it was doing what it is supposed to be doing (going to the standby mode). This was troubleshooted by Onkyo tech support on a Sunday. All the best about Onkyo customer support.
The problem was that some subwoofers (inluding my velodyne model) cannot process the LFE signals through the line level inputs on its amps, so the other way to run your subwoofer is to run the front left and right speaker outputs from your receiver to the speaker-level inputs on your sub, and then plug your front and left speakers into the soeaker level outputs on the sub. you have to set the onkyo receiver to "Subwoofer: No". that way the LFE signals are sent through the front speaker channels and you will get the same BASS output as if using the line-level input. O So yes it does require a bit more speaker cable, but it works fine now.
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