I'm not really sure what these are...I think it's like a amp thingy with 2 inputs and 4 outputs...to like split up the signal from the headunit...so it can be run to 2 different speakers...is this right...can anyone help me clarify/give me more information.

 

Crossover "crosses over" the signal so, for instance, only the lowest notes go to a sub, the midbass /midrange to the mids, and the high notes to the highs. Trying to play low notes, say 40-50 hz through a tweeter will likely blow it. Same with trying to play a real high note (say 12,000hertz) through a sub aint good.

 

well I have a 3rd gen with a recently replaced bose system, and I wanna add 2 2-way 4" speakers in the headrests, how would I do this?

 

Speakers in a headrest...interesting...never heard that one before..If you're talking about a coaxial, then the mid and tweet contained in it is already crossed over. If you get components, it will come with a passive crossover.

I would consider, though, highpassing (not letting any low signals in) the 4's since they won't be able to handle lower notes, say below 200-300 with authority, depending on the speaker and enclosure.

So you do or don't have Bose? I wasn't sure if you meant you replaced the Bose system with something else or you for some reason replaced a past system with Bose.....

If it's Bose, I can't help ya. If it's not (aftermarket stuff), what are you planning to use to power the speakers? Teh headunit or the amp? Some (I would guess not most though)headunits have a crossover built in and most amps do.

Just for my nosiness...why speakers in the headrests?

 

I just got a new car.. so, I'm putting in new speakers... In my old car I had 4" kenwoods and I bought "speaker savers" or what ever they are called at best buy to highpass the speakers.. For my new car I just bought some 4" JL coaxial speakers.. they came with what looked like the "speaker savers" soldered to the positive terminal... is this to highpass the speakers or do I need to get some "speaker savers" for my new JL's to highpass them?

 

they should come with a mini cap to prevent low frequencies to go to the tweets. the jl's should be fine how they came.