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passive crossovers

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=119627
Printed Date: July 05, 2025 at 2:48 AM


Topic: passive crossovers

Posted By: spmpdr
Subject: passive crossovers
Date Posted: January 25, 2010 at 1:34 PM

How do passive crossovers work as far a distributing power to the woofer and the tweeter?

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-A vision without a plan is just a hallucination-



Replies:

Posted By: i am an idiot
Date Posted: January 25, 2010 at 4:53 PM
A capacitor is a High pass device, it will only allow frequencies above a certain frequency to reach the Mid or mid/tweeter.  An inductor is a low pass device, it will only allow frequencies below a certain frequency to reach your woofer.




Posted By: Steven Kephart
Date Posted: January 25, 2010 at 4:58 PM
I thought you had a custom component set in your car. What are you using for a crossover now? A proper passive crossover will match the levels of the midrange and tweeter so they work together properly. The final solution will have an impedance curve and depending on the frequency being reproduced, that will determine how much power goes to the proper speaker. In other words the amount of power going to each speaker will vary with frequency.




Posted By: spmpdr
Date Posted: January 25, 2010 at 8:55 PM
Steven Kephart wrote:

I thought you had a custom component set in your car. What are you using for a crossover now? A proper passive crossover will match the levels of the midrange and tweeter so they work together properly. The final solution will have an impedance curve and depending on the frequency being reproduced, that will determine how much power goes to the proper speaker. In other words the amount of power going to each speaker will vary with frequency.


I am using custom crossover for my dedicated midbass600hz/lp and my midrange 600hz/hp but for my tweeter/midrange I am using a set of crossovers from my old mb quart fsa 216 compnents set. it crosses @ 4000/hz ,it was all i could do at the time.I am now looking to upgrade those crossovers to better ones ,thanks for the info about how the power is distributed to the speakers .any recommendations for a 2500-3000hz/hp crossover

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-A vision without a plan is just a hallucination-




Posted By: Steven Kephart
Date Posted: January 25, 2010 at 10:08 PM
It doesn't work that way. How do you know if the tweeter and midrange are summing properly with a crap-shoot crossover point and slope? To do it wrong will result in less than ideal sound. You have to take into account the speakers measured performance to design a proper crossover.

I have a couple sticky threads that map out how to design a custom speaker setup. It mainly focuses on speaker and equipment selection. However it should help you. Here are the links:

https://www.the12volt.com/installbay/forum_posts.asp~TID~61864~PN~1

https://www.the12volt.com/installbay/forum_posts.asp~TID~78597~PN~1




Posted By: spmpdr
Date Posted: January 26, 2010 at 7:37 AM
Thats exactly what I was thinking abot my crapshoot crossover ,thanks for the info and the links I will use them accordingly.

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-A vision without a plan is just a hallucination-





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