Altec Lansing VS3121 manual Symptom, Possible Problem, Solution, Sound is

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
Sound is	Volume level set too high.	Turn the VOLUME knob counterclockwise to lower the volume.
distorted.
	Computer operating system volume level is set	Adjust the computer operating system volume and balance levels to the
	too high.	center as a starting point, then adjust the level on the speaker using the
		volume control.
	Sound source is distorted.	WAV files are often of poor quality. So distortion and noise are easily noticed
		with high-powered speakers. Try a different sound source such as a music CD.
Radio	Too close to a radio tower.	Move your speakers until the interference goes away.
interference.
No sound from	Subwoofer volume is too low.	Increase the subwoofer volume on the control pod.
subwoofer.
	Bad connection.	Check to make sure that all cables are connected properly and are making
		a clear connection.
Low hum from	The AC in your house is at 60 cycles per second, which is	Some low hum may be detected when your speaker system is powered on
subwoofer.	within the audio frequency of the subwoofer.	without an audio source playing, or when the volume is set at an extremely
		low level.
Loud hum from	Bad connection.	Unplug the AC power cord from the surge protector (if used), and plug directly
subwoofer.		into an AC wall outlet.
		Move your cables. Check to ensure they are making a clear connection.
	Volume on your audio source device is set too high.	Disconnect your 3.5mm stereo cable from the audio source. If the loud hum
		goes away, lower the volume on the audio source.
		Lower the master volume or subwoofer volume on your computer, portable
		device, etc.
Too much bass	Subwoofer volume is too high.	Decrease the subwoofer volume on the control pod.
from subwoofer.
Distorted monitor.	Subwoofer too close to monitor.	Because the subwoofer is not magnetically shielded, it can cause distortion if
		it’s too close to your monitor. Move the subwoofer so it’s at least 2 feet from
		your monitor.

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