Caps for Horns
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Tourer
Joined: Aug 2016
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From: Miami/FL
Caps for Horns
Most of the horns in the market (if not all of them) come with a capacitor.
The value of this capacitor at least for Hertz and Audiopipe, is 3.3 microfarads.
Considering than this cap it is in fact a first order high pass crossover, and these horns are rated at 4 Ohms, the cutoff frequency for this value is around 12KHz.
Why this value then?
The value of this capacitor at least for Hertz and Audiopipe, is 3.3 microfarads.
Considering than this cap it is in fact a first order high pass crossover, and these horns are rated at 4 Ohms, the cutoff frequency for this value is around 12KHz.
Why this value then?
Last edited by flcusat; Sep 25, 2017 at 01:33 PM.
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Tourer
Joined: Aug 2016
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From: Miami/FL
I have the ATQ-1550 fed by the AD400.4 and when I turn on the system, even with the volume all the way to zero, I have a little pop on the horns (probably DC from the amp), that's when I started doing some research about the caps, and found this article, which I posted here on another thread.
http://www.audiofrog.com/community/t...overs/#post-68
I tried to get an answer in why he choose this value, but he hasn't answered yet.
For the research I've done, the value of the cap should be calculated at least one octave below the desired crossover point.
Her is a handy calculator.
http://www.carstereo.com/help/Articles.cfm?id=1
Banned
Joined: Dec 2016
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From: Miami, FL
I used to tune my bikes like this....looking at every number and calculation. Then I learned that I'd much rather tune the bike to how I wanted it to sound vs. some numbers on a calculator. Have you played the horns, with a capacitor in series and taken a DMM and measured the impedance....and confirmed its 4ohm like the calculation you are basing the crossover point off of?
My recommendation -- use the capacitor, then use the TWK to EQ it how you want it to sound. You shoulda come by Petersons North on Saturday...Bikes on the Beach held an Irma relief event and Sound Off. We won every class
My recommendation -- use the capacitor, then use the TWK to EQ it how you want it to sound. You shoulda come by Petersons North on Saturday...Bikes on the Beach held an Irma relief event and Sound Off. We won every class
Thread Starter
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Tourer
Joined: Aug 2016
Posts: 432
Likes: 10
From: Miami/FL
I used to tune my bikes like this....looking at every number and calculation. Then I learned that I'd much rather tune the bike to how I wanted it to sound vs. some numbers on a calculator. Have you played the horns, with a capacitor in series and taken a DMM and measured the impedance....and confirmed its 4ohm like the calculation you are basing the crossover point off of?
I saw your video and congratuled Junior at the Big Chill on Sunday.
Congrats!
Last edited by flcusat; Sep 26, 2017 at 10:03 AM.
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Road Master
Joined: Jul 2009
Posts: 830
Likes: 44
From: Illinois
Using a capacitor in an active system is a fail-safe.
In fact if you tear down a Hertz passive crossover, you will see a cap on the board feeding the Tweet
So if you are using a Active CO then the Cap in line after an active system would make sense, as a fail safe
But if you are using a Passive CO like the Hertz, You already have a CAP inline with the tweet
But since you are running the JL Audio TwK, I would add the cap, (As a fail safe)
http://www.bcae1.com/passxovr.htm
In fact if you tear down a Hertz passive crossover, you will see a cap on the board feeding the Tweet
So if you are using a Active CO then the Cap in line after an active system would make sense, as a fail safe
But if you are using a Passive CO like the Hertz, You already have a CAP inline with the tweet
But since you are running the JL Audio TwK, I would add the cap, (As a fail safe)
http://www.bcae1.com/passxovr.htm
Last edited by Makdaddy; Sep 26, 2017 at 10:21 AM.
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Thread Starter
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Tourer
Joined: Aug 2016
Posts: 432
Likes: 10
From: Miami/FL
Using a capacitor in an active system is a fail-safe.
In fact if you tear down a Hertz passive crossover, you will see a cap on the board feeding the Tweet
So if you are using a Active CO then the Cap in line after an active system would make sense, as a fail safe
But if you are using a Passive CO like the Hertz, You already have a CAP inline with the tweet
But since you are running the JL Audio TwK, I would add the cap, (As a fail safe)
http://www.bcae1.com/passxovr.htm
In fact if you tear down a Hertz passive crossover, you will see a cap on the board feeding the Tweet
So if you are using a Active CO then the Cap in line after an active system would make sense, as a fail safe
But if you are using a Passive CO like the Hertz, You already have a CAP inline with the tweet
But since you are running the JL Audio TwK, I would add the cap, (As a fail safe)
http://www.bcae1.com/passxovr.htm
In theory if you put a value that is for a higher frequency than the croosover point of the DSP, you are defeating the DSP.
Now, here comes the other factor that Alex stated. What is the impedance of the horn at the frecuency that the cap is supposed to be for?
Road Master
Joined: Jul 2009
Posts: 830
Likes: 44
From: Illinois
I think you already pointed that out
The cap @ 3.3 microFarad would yield a crossover freq @12045 @ 4ohms
Both the cap and the horn rated @ 4ohms
What are you setting the crossover point on the Active ?
I agree that I would keep the cap as close to the desired point on the Active.
The cap @ 3.3 microFarad would yield a crossover freq @12045 @ 4ohms
Both the cap and the horn rated @ 4ohms
What are you setting the crossover point on the Active ?
I agree that I would keep the cap as close to the desired point on the Active.