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I would like to change out the speakers in my car, since they are really poor quality. I am attracted to 3-way speakers from what I have read about them and need some help when I am shopping for them. Does the description of the speaker need to specify that it is composed of woofer, tweeter and mid-range or is there other terminology that might be used to specify the same thing? Also, I have read that the greater the frequency response range the better. Is there a "best" range to look for?
40hz-40Khz at minimum for main speakers. Subs should be able to get down to 16hz for the sub-octave and first octave.
You also need to look at the specs and listen to the speakers to see how they handle overlapping frequencies at the crossover from one to the other (midrange to tweeter, e.g.).
3 way components are nice, mainly because the offer more fredom in placement. If you mean something like this: Beware. On the cheapest speakers of this configuration you migth not even get a 3 way speaker. i have actually seen such speakers where the super tweeter are just a dummy, basically just a shiny dome, without magnet, coil, or even a pieco disk to make it do anything. Actually, my favorites amoungst the coaxial`s are these: Made by Morel for a brand called Macrom, even Xtant sold these under their brand. Morel still makes similar models they are a bit costly, but in my opinion they are worth it.
yes you are right higher frequency response is good for audio speakers. I have one set of mcintosh car speakers and they working fine. You can try your 3D car speakers on mcintosh websites. http://www.mcintoshlabs.com/us/Products/pages/ProductDetails.aspx?CatId=CarAudioSpeakers&ProductId=MSS630