I just bought the Ls21 external speaker system. They work but the volume is incredibly low and the sub doesn't work at all. Also it works without the plug being in. Very strange. Suggestions? Drivers? what could be the issue here?

Gently open the front grille and remove the driver. You should see if the wiring to the driver is loose.

There are 2 volume controls on the audio output in windows 7. one is the system volume the other is the device volume. make sure that they are both at full and then control the sound volume on your speakers.

Speakers don't require drivers. Only your sound card. Connect as instructed. Usually the green 3.5mm port is the speaker input.

Hello, welcome to Fixya!

Fault is either from the main system or the sub-woofer itself.

You need to test both unit in order to detect which of the two is giving the fault, so that you can concentrate on the faulty unit.

Test the woofer with a AA battery or any other battery. Put your ears close to the woofer and observe if you will hear any sound. If the woofer makes sound, then it means the woofer is working, but if it doesn't make sound, then it means the woofer is defective. Or you can disconnect one of the working speakers and connect the woofer to that part. If there is no sound, then obviously, the woofer is defective.

If the woofer seem to be working, then the unit needs to be tested also.

Connect one of the working speakers to the sub-woofer's section of the main unit. If the speaker doesn't bring out sound, check the system's menu settings, check the volume and make sure the sub-woofer volume is raised to the highest level and not on mute. ( Note that most Theater systems has separate volumes for each speakers). If the volume is raised to the highest level and there is still not sound from the woofer part, then it means the woofer channel has burnt. It could be a fuse or a defective channel. At this point, I think you need help from a repairman.

I hope the above is clear.

Regards.

repeat your setting for sub-try another connection cable from good working speaker----test your sub in other system and confirm the volumes and knobs setting in your sub.

check if the external speakers u plugged in came with an internal amplifier, if not then u will have to use an external amplifier to get max output from your external speakers.

Depending on the software that runs the sound card (you can find it in the control panel), the ports may be configured differently than they used to be. Check in the control panel and see if there is way to adjust the "plugs" and what they mean. Some of the sound cards allow you to change your mic to a sub and your input to an output!

The set up should be as this.cable plugs into headphone jack on your pc. that connectects to your powerd subwoofer it is power correct! then your small speakers connect to the sub box or thew should? look on the sub box usually front and on the bottom.if thee actual speaker connections then they will be on the rear.

Different sound system use different voltages for their speakers. Look up in your computer manual what the electricial requirments are for the speakers and see if the one you bought matches.