I'm unsure which to set it to for my speakers, my system is listed in my signature. Basically on my amp there are three filter switches.

1) High for high pass - Mid tweeter
2) Off for all pass - Full Range
3) Low for low pass - Subs

So assuming I know squat about car audio, what exactly does this mean? Also how do I know if my speakers are mid tweeter or full range? I have 2 way speakers up front and 3 way speakers in the rear.

 

Run your fronts high pass, and your 6x9s full range.

 

Highpass - Usually frequencies from 50-80hz and up. These frequencies are best reproduced by your smaller speakers, like 6.5", 5.25", etc...

Off/Bypass/Full range - Exactly what the name states. All crossovers are bypassed and the speakers are recieving all frequencies. This is good if you have passive crossovers that will divide the frequencies between Highs, Mids, and Lows. (Tweeters, midranges, and subs) If you don't have passive crossovers, I would leave this alone.

Lowpass - Hmm... think of this as a highpass for your subwoofers. This determines what frequencies will be sent to your subs. Most of the time theses are set at 80hz and below.

Now, your speakers:
2-Way = A midrange driver and a tweeter
3-way = A midrange driver, a tweeter, and a super tweeter for extended highs.

I would use the highpass crossover in your situation. Somwhere around 50hz.

 

Thanks for the help guys, that made alot more sense now.

My amp has a passive cross over. These are the settings I'm going to try later today.

Fronts: Highpass
Rears: Full Range

 

Your amp has an active crossover. Active crossovers are adjustable and run off of your 12v system. A passive crossover for the most part is not adjustable, and is not powered. This is what would be included with a component set. It uses a series of resistors and whatnot to send the right frequencies to the right speakers.

If you listen to your music loud, you will want to run your rear speakers highpassed also. Most 6x9's are only good down to about 40-50hz, and they may distort if played at high volume, when run fullrange.