Subwoofer fix No sound coming out my sub

Audio subwoofers are used to augment the sound quality that is released by stereos and other audio component systems. As a result of actively using subwoofers, the sounds projected from the sound systems (such as music and voice) not only become louder, but also have a fuller output. Subwoofers, however, are not immune to problems. These issues often result in distorted sound.
Issues Among the most common problems of audio subwoofers is the loss of their bass effect while playing music or other sound files. The majority of people that experience this problem do so because they have installed their subwoofer on a different sound system than the one where it was originally installed. Additionally, there are scenarios where the subwoofer does not produce any sound. b> Troubleshooting b> Subwoofer issues are typically caused by one of two things: improper settings or broken receivers. You can troubleshoot the lack of bass or other sound effects that decrease the quality of sound by checking and adjusting the settings of the subwoofer as well as your audio system. Although subwoofers work on almost all types of audio systems, some have to be adjusted to ensure quality sound while utilizing them. Broken receivers, on the other hand, have to be replaced with new ones. b> Significance b> Fixing subwoofer problems proves to be important, not only because it will increase your enjoyment while listening to music, but also because utilizing a subwoofer improves the audio system's overall performance. When subwoofer issues go ignored, there is a tendency for the audio system to become overworked, as the user likely works the controls on the audio system rather than using the subwoofer's settings. As a result, additional audio problems may arise due to playing at full-blast volume and making other unnecessary adjustments to compensate for the lack of a subwoofer. b> Recommendations b> One way of handling subwoofer issues is by reviewing the owner's manual, paying special attention to the speaker settings. Different audio systems have their own recommended settings to ensure quality sound and that all the effects can be felt and heard while the sound file is being played. If the manual does not provide any recommended settings and/or adjustments, tweaking can be done on the audio system's subwoofer menu to create your preferred sound. Through tweaking, you will be able to find the desired quality, as well as detect and correct any unnecessary noises and vibrations coming from the subwoofer. b> Maintenance b> Audio subwoofer problems can be prevented by regularly cleaning and maintaining both the subwoofer and the audio system where it is connected. The speakers should be dusted off periodically to ensure clean release of sound and the wiring should be checked for open exposures. These exposures should be immediately repaired to prevent further damage. Fix a Subwoofer b> A subwoofer, or a "sub," is an important part of your overall sound system, whether it's in your home or car. A sub's most important quality is bringing out sounds you can feel rather than just hear. However, they are also susceptible to wear and tear from overuse, and the sound quality will be greatly affected by this. Here are some steps to fix a subwoofer.

Check with your manufacturer's Tech Support Web site. Usually with a subwoofer, the problem lies with the voice coil, which might just be burned out. These are usually fixed by sending them into the manufacturer, so determine how much you want to spend to repair it versus how much it would cost just to buy a new one. Roam through the Tech Support forums. It's likely that someone had the same problem as you with your sub, and you can run the symptoms past a few other consumers to see what diagnosis they found. Identify the specific problem if you can. You can look for tips to fix this problem on the manufacturer's Web site, or if you're technically savvy, you can try opening the sub and looking at it yourself. Two major manufacturers of subs include MTX and MK Sound. Check the bronze-colored coil underneath the foam cover. Note whether it looks worn, burned, warped or distorted. This may be the cause of your sub sounding fuzzy or muffled, which means it needs replacement. Look at the fuse inside the speaker and test it if you know how. This is a likely problem that causes your sub to power up improperly, play sounds at about half the volume or intermittently fade in and out. If the fuse is discolored or shows a short, you'll need to replace it.

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The problem is the Ic or transistor use a tester

Turn the out put leval down on your sub, End the reciever, I was turn up to high,End that will cause it to cut out.

Sounds like you have a passive subwoofer, you run speaker wire from 'front speaker receiver out' to the subwoofer, the 'subwoofer out' to your front speakers. Seem like your sub has a crossover that grabs the bass frequencies and passes off the rest to the front speakers

If you have a 'subwoofer line out' on your reciever and a 'line in' on you subwoofer then just use that single wire, this would be for a powered sub. You know that you have a powered sub if your sub has a power cord attached to it.

I assume it's an active subwoofer, since it hums. Did you activate sub in the receiver menu? Did you turn up the volume on the sub?

Take it to a real technician. Sounds like you've proven the internal amp is shot.

it sounds like the sub is rubbing in the voice coil.
put the speaker in upside down to what it was before.
sometimes that extra bit of downward pull is enough to offset the error.
There are speaker reconing experts out there but it is cheaper to replace the sub itself.
the sub can be replaced for sure.

THIS UNIT HAS NO SUB WOOFER AMP IN IT. THE ONLY WAY TO OVER COME THIS IS TO HOOK THE LEFT AND RIGHT FRONT SPEAKERS STRAIGHT TO THE SUB WOOFER AND THEN GO FROM THE SUB WOOFER BACK TO THE INPUTS ON THE BACK OF THE UNIT FOR THE FRONT SPEAKERS. THE SUB WOOFER THIS WAY WILL EXTRACT THE BASS AND THE FRONT WILL RECEIVE THEIR PART. THIS SOUNDS CRAZY AS HELL I KNOW BUT THAT'S HOW I GOT MINE TO WORK. THE OUTPUT FOR THE SUBWOOFER IS USELESS AND PUT THERE FOR YOU TO HOOK UP AN AMP FOR A SUB WOOFER. EVERYTHING HAS SHORT COMINGS, AND THAT'S THE ONE FOR THE AX-720.

I'm having the same issue as pdoug: Sub rumbles in test mode, doesn't produce sound otherwise. Which makes me suspect it's the receiver itself -- the filter (or whatever) it is that should be separating the bass signal and sending it to the sub is not working. At least that's my guess.

Either way... this sucks.

The circuit that should be turning the sub on and off based upon the presence of an audio signal is not working correctly and the sub is trying to reproduce 60 cycle hum. The unit needs service.
Dan