# How do I choose a capacitor to crossover mid frequencies?

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#### vascobrissos14

##### Estimable
Hello,

I am building a speaker with 2 10W mid range speakers.

My question is which capacitor do I need to block low frequencies?

Thank you for all the help!

Solution
The frequency in the formula is where the speakers response is 3db down.
A single capacitor will only give you a 6 db per octave roll off so the speaker will have appreciable output at least 2 octaves lower than that. If you crossover at 200 then the speaker will only be 6 db down at 100 and 12 db down at 50.
I would guess that the speaker itself already way down at 200 hz so you would be adding the crossover to the response of the speaker. You might be OK without any crossover depending on where you bring the woofer in.

#### vascobrissos14

##### Estimable

As you said, zillion of things that I dont need to know since they are far off from what I want to do. Ty

#### USAFRet

##### Illustrious
Moderator

I'm just saying that your question can't be answered in a single post.
There are a few other components in the speaker wiring than a single capacitor, that all have to work together.

There is not a single number that would work in all DIY speakers.

#### vascobrissos14

##### Estimable
I posted the specs. Can you help me now? Or is there anything left? Thank you

##### Distinguished
Moderator

Define "low" frequencies.

Do you want low end cutoff at 20Hz, 60Hz, 120Hz, 300Hz, etc.?

What about high end cut off?

Methinks you have much to learn before you try to do it yourself.

#### vascobrissos14

##### Estimable
I want to cutoff at 200Hz

#### vascobrissos14

##### Estimable
And m8, we aren't born knowing everything.. that's why I came here, to ask for help

##### Distinguished
Moderator
Did you do the math listed on the site you provided? That will provide the needed value.

I find it hard to believe that a 3", 10W driver would even have a meaningful response below 1000Hz. Probably closer to 2000Hz

#### vascobrissos14

##### Estimable
Ok Ill try it later and check the frequency response.
But the result of the formula is the frequency it lets the speaker go to. Right?

#### americanaudiophile

##### Titan
The frequency in the formula is where the speakers response is 3db down.
A single capacitor will only give you a 6 db per octave roll off so the speaker will have appreciable output at least 2 octaves lower than that. If you crossover at 200 then the speaker will only be 6 db down at 100 and 12 db down at 50.
I would guess that the speaker itself already way down at 200 hz so you would be adding the crossover to the response of the speaker. You might be OK without any crossover depending on where you bring the woofer in.

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