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What's The Point Of Adding A Crossover Into A Speaker? Answered



Best Answer 6 years ago

To be simple, a crossover limits frequencies to eliminate unwanted distortion. Usually it contain 3 main components, the resistor, the coil (inductor) and the capacitor. There is the passive type, the passive type can be found inside some speaker enclosures while the active usually lies inside an amplifier or equalizer.

Here a link to wikipedia: http://en.wikipedia.org/wiki/Audio_crossover

A crossover is used to filter and direct the sound frequencies between the different speakers, subwoofer, tweeters etc, and make the overall sound more streamlined. There's 2 types. The passive type is the most common and is installed down from the amplifier and is usually mounted within a speaker box. An active type requires separate amplifiers. If you're installing just a basic system with 4 speakers, then you don't really need to worry about a crossover (because full range speakers already have passive crossovers built in). It's when you're installing a more robust system that you'll want to look into a crossover.

I hope that helps. :)

One thing I do not agree. if you have a custom speaker system in terms of mini horn tweeter, 5 inches mid-range and 15 inches speaker system, you don't need the low frequency crossover for this combination. Because, if you block the freq. between 20Hz to 120Hz to the woofer/speaker, in that case the 5 inches mid shall not going to serve the exact mid freq. you need. so I think add a high and mid crossover to the respective drivers except the woofer, so that you can listen the bass and strong mid power from the 15 inches speaker. I believe this is a custom but good solution for the speaker system i just describe. Another thing need to be noticed that, normally a woofer is not produce any high-mid and high frequencies at all, so why we need the low crossover!! If its an error config. kindly give me a suggestion that what I can do with my speaker that I wanted to listen. By the way.... the speaker combination I'm talking about is my own designed custom model. I just add up some polarized caps with the mid and highs... that's it. sound is good even in 50 to 70% volume... no complain at all...

when you gonna keep the bluetooth boom box instuctable ?

How can I create a Bluetooth subwoofer that accommodates all the small bluetooth speakers that are being sold. A DIY. I would like to pair it with a small BT speaker I have. I'd need a little low end cause I listen to a lot of lectures and need a little bass in the voice. any info would help.


1st things 1st.
A speaker is the combination of parts assembled together to form the complete "box" or "enclosure" with accompanying driver(s), crossover(s), fill, port(s) - if any, etc. All the other parts go by names already given (and those not given but could be researched if need be) in the preceeding sentence.

A driver is that active element that moves the air. Most are some form of linear electromagnetic motor (you know, the round cone that vibrates - but you already knew that) while others use forms of electrically controlled deflection to vibrate the air. Each driver is designed to reproduce, efficiently, a certain range of audio. Any audio signal outside of that range that is fed to that particular driver is wasted energy and it can cause distortions of those frequencies that the driver is supposed to reproduce.

Crossovers separate the audio signal into the different audio bands to properly excite the corresponding drivers. Very Low Frequencies, usually in the range of 10-80 Hz, are reserved for the subwoofer. If there is no subwoofer, these frequencies are added to the regular woofer's band. Low Frequencies, depending on the system, run from around 20 to 800 Hz (or more, sometimesup to 2000-4000 Hz) for the woofer. Midrange Frequencies are usually around 800 to 4000-6000 Hz, again, depending on the system design. High Frequencies are from around 2000-4000 Hz up to 20,000 Hz for the tweeter. There are other frequencies touted to run up to 25,000 to 30,000 Hz for "super tweeters", but humans cannot hear them.

So, you can see that a crossover is used to split the signal up into frequency bands that are meant to feed specific drivers to make them perform efficiently and cleanly. And you'll find that there is a bit of overlap in the frequency bands due to there being a roll-off of the frequency band, like a hill - not a cliff, so that you do not get "holes" in the audio.

This is probably much more than you wanted to know, but I believe that it is better to know more than not enough. And this is just a barebones, basic explanation. It doesn't even get into the protection that a crossover provides to the driver(s).


canucksgirl is has it almost exactly right. Basically the crossover divides the signal into two or more channels based on the frequency. (Low frequencies go to the subwoofer, mids go to the midrange speaker, and the highs go to the tweeters.) What she is not 100% correct about is when you need to worry about them. You always need to check to see if the speaker has a crossover in it (if it has more than one speaker in it for different frequencies in it), and if it doesn't you need to figure out how to add it. It doesn't matter how good the speaker is, if it has more than one speaker in it for different frequencies it needs a crossover, but most that need it have it built in.

(Like I said, she is almost right.) :)