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What is a Low Pass Filter

I can not fin a definition that a newbie like me can understand searching Audiogon. My Subwoofer, Sonus Faber Cremona, has 2 dials in the back. One for Low Pass Filter, switchable from 38-65Hz 6 positions and one for Gain that reads min to max.

More Info:
http://www.sumikoaudio.net/sonus/prod_cremonasubwoofer.htm

Thanks in advance for any help,
David
captaincapitalism

Showing 2 responses by captaincapitalism

captaincapitalism OP
52 posts
 
Viridian, I do not understand your response. Let me ask you this: Why would I want to "attenuate" any frequencies? I am assuming that by "attenuate" you mean that it is modifying the signal above a certain frequency?

thanks,
David
captaincapitalism OP
52 posts
 
Thank you all for your responses. I am still a bit confused. Specifically One question: Does the Low Pass Filter completely filter out anything above the Low Pass Filter’s freq setting much like the PrePro's Sub cross over? Or does it reduce it somehow?
If it completely filters out anything above the Low Pass Filter’s freq setting than I have I been missing out on 15 freqs all this time? Since I was told that most people have the PrePro’s crossover at 80hz, that's what I did. And if the PrePro is sending all information 80hz and below to the sub and the sub filters out anything above the Low Pass Filter settings, than I have been missing all those freqs?
Also, Why would my sub highest Low Pass Filter be 65hz? Don’t they know that some people like sending the sub up to 80hz?
It seems that there should be a rule that the PrePro’s crossover can not exceeds the Low Pass Filter’s freq setting.
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