Question about Infinity BU-120 Subwoofer

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Have a BU2 subwoofer no sound

Power light is on. Will turn on and off. No sound at all

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Start by checking for a blown fuse. Sometimes the fuse holder is on the back panel.

Posted on Feb 10, 2008

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Grubhead
  • 4767 Answers

SOURCE: No sound coming from my Infinity BU2 subwoofer.

I suspect that whatever semiconductor does all the amplifaction has departed this life. If you check the PC board it might point to a burnt out part or a blown one. If not look at anything big or with a heatsink on it.

Posted on Feb 02, 2010

6ya6ya
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Posted on Jan 02, 2017

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Power turns(light) but no sound. Fuses all good??


apparently there is are some components on the main board that need replacing:

This is usually what needs to be replaced on these subs.

Replace

R830
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Direct from Sony:
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No sound comes out of the subwoofer. Sound passes through and the power light is on, but no subwoofer sound. Any ideas? Fuse? Easy fix? Can this subwoofer be replaced? is it still available? Can I buy a...


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Jul 10, 2008 | JBL PB10 Subwoofer

1 Answer

Orange light


I have the same speaker and it sounds like its behaving properly.

if you look on the back of the amp, you will find a switch that allows the speaker to automatically switch the speaker on or off based on the level of the audio coming from the tuner that it is attached to. If the switch is set to the auto mode, then it will listen for audio on the line and if the signal level coming into the subwoofer is high enough, the amplifier in the subwoofer will turn on and play. If the signal is not strong or loud enough, then the subwoofer will not turn on. There are two solutions to getting the speaker to work.

1. When you turn on the tuner or audio source that is feeding the Subwoofer speaker, you will need to turn it up loud enough to trigger the circuit in the subwoofer to switch on.

2. Alternatively, you can bypass the automatic circuit and set it to the "ON position all the time. In this position the subwoofer is always ready and waiting and should play any signal that is fed to it regardless of the loudness or volume of sound from the tuner. The switch is located on the back of the speaker cabinet just to the right of the red and black speaker wire connections. It is labeled "AUTO" and the switch positions are labeled ON and OFF.

Hope this helps!

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