Speaker problem

[cool9]

I bought some good 200W used speakers on ebay in very good condition. (Received them today.) Every once in a while the left speaker will crackle/static (very noticable when no music is playing) and it gets louder when the unit's remote volume is turned up and vice versa. What could be the problem? I don't think it's a cord running to the speaker because I moved it around quite a bit and it had no bearing on the crackle. Only when I fooled with the remote volume knob. The plug from the speaker runs to the subwoofer box. The hand-held volume remote runs to the subwoofer box (where the amp is). Dirty/bad volume knob? I'd like to fix this myself because this unit has incredible sound.

[Sylvander]

200 watt, WOW, that sounds powerfull!

And are they stereo speakers, and do they have their own built-in stereo amplifier?
Left [the one that crackles? Sky-high noise to sound ratio] & right high frequency speakers [with tweeters?], and a single [low frequency ] woofer?

Does it sound like it's the action of adjusting the volume [either upward or downward] that is causing the crackling? [Poor connection in the volume control slider]
Or does the noise to sound ratio increase as the amplification is increased [higher noise ratio at higher amplification (faulty amplifier components, worse with greater amplification?)].
Or does the RATIO stay constant, and is more noticeable because of the higher volume level [constant noise ratio no matter what the amplification (faulty tweeter crossover components?)].

[Fruss Tray Ted]

A few suggestions:

A: You could try using some tuner cleaner tuner cleaner (http://www.radioshack.com/sm-tv-tuner-control-cleaner-and-lubricant--pi-2103700.html) and spray the volume knob's innards. Results are spotty or only partially effective. around $10

B: Replace the volume control 'pot' or potentiometer. This would involve knowledge of soldering techniques but is not all that difficult to do. This is the best solution as it brings things back to original condition. around $20 or more if you have it done for you.

C: Turn the volume all the way up or to some spot that there is not crackling and use software to adjust the volume such as Windows 'Volume' control. This is quite effective and by far the cheapest way to do it. Cost = 0