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Message: <blockquote data-quote="i2ain2thunder" data-source="post: 8088500" data-attributes="member: 631331">HPF=high pass filter, filters out sounds below a set frequency.  Use this on your speakers to keep them from getting frequencies too low for them to handle.LPF=low pass filter, filters out sounds above a set frequency.  Use this on your subs to keep them from getting frequencies that they are not meant to reproduce.Generally speaking subwoofers should be crossed over below 90hz to keep the bass from being heard from an ascertainable position.  Essentially you don't want your listeners to hear the bass coming from the back, it should be almost sounding like it's coming from everywhere.  You can cross a subwoofer over at a higher frequency, it is not recommended though.As far as where your crossover setting should be for your other speakers, this is left up to you to hear and distinguish how the blend of the sound from all your speakers sounds best.  Typically speaking you want to cross the other speakers over as low as they can tolerate without producing distortion.  generally for people this can be from around 50hz-150hz.the reason for crossovers is to protect speakers from getting frequencies they can not handle properly, this applies more readily to smaller speakers as in general their ability to tolerate lower frequencies is not as good as larger speakers.  Every speaker is different, but these are generalities that point you in the right direction.Now crossovers also depend on their slope.  Crossovers do not simply cut off frequencies above or below a set point. for good reason their job is to protect the speakers and to help blend of the speakers together.  The lower the slope (db amount) the more frequencies beyond that set point are allowed through, the higher the slope, the sharper the cutoff is.You will need to play with your crossover settings to see when they sound best, remembering that little speakers cannot handle low frequencies as well as bigger speakers, (this is why subwoofers are big, and tweeters are small)Not having crossovers in a system means that little speakers are getting all the low frequencies they are not supposed to.  This is the number 1 reason everyone who has a regular radio in their car with no crossover blows out their speakers.  Those speakers are getting the low frequencies they are not meant to reproduce, what makes it worse is people try to achieve more bass by cranking the bass knob on their radio.  This adds distortion to the already on the edge speakers creating a situation where their speakers will blow at some point.Remember the best way to get bass is not to crank bass settings up, but to have adequate speakers and amplifiers.  Gains and  crossovers are designed to protect your speakers and subwoofers from receiving too much current or improper frequencies.</blockquote>

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