When you are using your speaker system,you may meet these problems as below. Make sure you are following the instructons on the user's guide.

Symptom Possible problem Solution
No power LEDs are lit
(AC adaptor operation)		 AC adaptor isn't connected to a electrical outlet and /or the power supply connected is not plugged into the power supply jack. Plug the AC adaptor into a electrical outlet and plug  the power supply connector into the power supply jack. Check to see if the "power on" LED is illuminated.
electrical outlet is not functioning. Plug another device into the same electrical outlet to confirm the outlet is working.
 Power isn't turned on. Switch the speaker power on and an LED will light.
No power LED lit
(battery operation)		 Batteries have been put in incorrectly. Install 4 AA batteries into the battery compartments
Follow the instructions, make sure the batteries are installed with the correct polarity
Batteries are run of use Install a new set of batteries.
Power isn't turned on. Swicth the speaker power on.
No sound from one or more speakers Power isn't turned on. Verify batteries are installed if the AC adaptor isn't being used. 
Swicth the speaker power on.
Verify the power button has been pushed and the LED is illuminated.
Swicth the speaker power on.
Volume is setted too low. Adjust the volume according to your test.
Check volume level on alternate audio sourse device and set at the level you like.
3.5 mm signal cable is connected to wrong output on audio source. Make sure the signal cable is connected and fully inserted in the "line-out" or "audio-out" or the headphone jack on your sound card or other audio sources.
Problem with audio source. Test the speakers on another audio source by removing the signal cable from the audio source and connecting it to the"line-out","audio-out",or the headphone jack of a different audio source.
No sound from center or rear satellites Rear or center volume level is set too low. Increase the rear or center speaker volume level to your taste
Bad connection Check the satellites speaker cable plugs are connected to subwoofer well.
No sound from subwoofer Subwoofer volume is too low Increase the subwoofer volume to your taste.
Bad connection Check to verify that all cables are connected properly and made in a clear connection
Sound distortion Sound sourse has distortion. WAV and MID files are often poor quality; therefore distortion and noise are easily noticed with high-powered speakers.Try different audio source such as a music CD.
Volume level on operatingsystem is set too high. Check the operating system level and decrease if necessary.
Cracking from speaker Rodio interference Move your speakers to a different position to see if the interference goes away.
Bad connection Check connection of the signal cable, make sure it is connected "line-out", "audio-out" or the headphone jack on your iPod player, MP3 player, CD player, or other audio source.
A problem with your audio source Unplug the signal cable from the audio source. Then plug it into the headphone jack of an alternative source.
Loud hum from subwoofer Bad connection Unplug the AC power cord from the surge protector(if used), and plug directly into an AC electrical outlet
Move your cables. Check to ensure they are making a clear connection
Volume level on operatingsystem is set too high. Check the operating system level and decrease the master volume or subwoofer volume on the audio source if necessary.
Low hum from subwooer The AC in worldwide is at 50/60 Hz (50/60 cycles per second, which is within the audio freqency of the subwoofer) Some Low hum may be detected when your speaker system is powered on without an audio source playing, or when the volume is et at an extremely low level.
Too much bass from subwoofer Subwoofer volume is too high Decrease the subwoofer volume at your taste.
Distorted monitor  Subwoofer is too close to monitor Since the subwoofer is not magnetically shielded, it can cause distortion if it's too close to your monitor. Move the subwoofer 2 feet from your monitor at least.