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Offline craziechild

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tweeter setting
« on: November 22, 2006, 06:51:13 AM »
hi all...

i recently jus got active on my super cheap ICE... and i found out tht my tweeter has a cap attached for the positive input... rating is 3.3uF...

i am wondering if the cap will affect the hz point or not?

cheers...
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Offline netken

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Re: tweeter setting
« Reply #1 on: November 22, 2006, 07:37:08 AM »
i think the cap is to cut of the highpass frequency ... it there isnt a cap to protect the tweeter ... then it will be kaboom !

the value i will let the sifus explain ....

i too install a rm35.00 supposedly pioneer tweeter to my system ... not too bad sounding ...  /71
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Offline craziechild

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Re: tweeter setting
« Reply #2 on: November 23, 2006, 10:05:36 AM »
netken sifu... so the cap will sort of disturb my tunings?

say i high pass the tweets at 3khz... and the cap only allow a 5khz... so with the cap on will i still be able to run 3khz? or i hav to take them away?

i dunno its jus me or something... i jus feel tht there is some hz missing when i tune my tweets at 3.5k...
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Offline Zenn

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Re: tweeter setting
« Reply #3 on: November 23, 2006, 10:57:14 AM »
take it away lah, that capacitor is oledi acting as a filter, so when u cross somore, oledi double filtering, thats why u feel something missing....
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Offline wengweng

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Re: tweeter setting
« Reply #4 on: November 23, 2006, 11:34:50 AM »
I presumed that there is only 1 capacitor attached. If it is 3.3uf, then the highpass value should be 12000Hz at 6dB. Ie, your tweeter is playing frequencies above 12kHz, and also playing with -6dB for every octave below 12kHz. The value is ok for the protection of your tweeter from "frying". So for tuning purpose, you can set much lower HP frequencies at your crossover (say 1khz-2khz) to let the capacitor to do its job. Then tune your mid to match your tweeter. It is not as flexible as running active of course. If you are confident that you won't "mistune" your tweeter, then you can take it off for more flexibility.


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Offline netken

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Re: tweeter setting
« Reply #5 on: November 23, 2006, 11:54:14 AM »
Quote from: craziechild on November 23, 2006, 10:05:36 AM
netken sifu... so the cap will sort of disturb my tunings?

say i high pass the tweets at 3khz... and the cap only allow a 5khz... so with the cap on will i still be able to run 3khz? or i hav to take them away?

i dunno its jus me or something... i jus feel tht there is some hz missing when i tune my tweets at 3.5k...

if ur oredi playing active, then like what sifu zenn explain above is good !!

if u pass at 3k and the cap oni allow at 5k, u will still be playing at 5k because cap filters 5k and below ....
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Offline netken

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Re: tweeter setting
« Reply #6 on: November 23, 2006, 12:01:11 PM »
Quote from: wengweng on November 23, 2006, 11:34:50 AM
I presumed that there is only 1 capacitor attached. If it is 3.3uf, then the highpass value should be 12000Hz at 6dB. Ie, your tweeter is playing frequencies above 12kHz, and also playing with -6dB for every octave below 12kHz. The value is ok for the protection of your tweeter from "frying". So for tuning purpose, you can set much lower HP frequencies at your crossover (say 1khz-2khz) to let the capacitor to do its job. Then tune your mid to match your tweeter. It is not as flexible as running active of course. If you are confident that you won't "mistune" your tweeter, then you can take it off for more flexibility.

nah... this is how a real sifu explain ... kekeke...  /92 /92 /92
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Offline wengweng

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Re: tweeter setting
« Reply #7 on: November 23, 2006, 06:16:51 PM »
Quote from: netken on November 23, 2006, 12:01:11 PM
nah... this is how a real sifu explain ... kekeke...  /92 /92 /92

 /53  my sifu teach me one......
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Offline craziechild

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Re: tweeter setting
« Reply #8 on: November 23, 2006, 10:55:13 PM »
wah suddenly so many replies... hehe....

thanks you all... for being kind with your knowledge... hehe....

cheers....

sifu weng2

what you mean by this:
and also playing with -6dB for every octave below 12kHz
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Offline netken

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Re: tweeter setting
« Reply #9 on: November 24, 2006, 07:33:40 AM »
Quote from: wengweng on November 23, 2006, 06:16:51 PM
/53  my sifu teach me one......

that sifu arrr ?? u outdo him oredi lerr ... u just dowan to admit ...  /07
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Offline wengweng

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Re: tweeter setting
« Reply #10 on: November 24, 2006, 09:15:30 PM »
Quote from: craziechild on November 23, 2006, 10:55:13 PM

what you mean by this:
and also playing with -6dB for every octave below 12kHz

Numerically, if the loudness is set to say, 90dB. Then the loudness for frequencies from the tweeter would be

12kHz and above - 90dB
6kHz - 84dB
3Khz - 78dB
1.5kHz - 72dB
750kHz - 66dB

p/s each octave below is half of the current octave. Each octave above is double the current octave

Not good in explaning hope you know what I mean..... /69
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Offline craziechild

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Re: tweeter setting
« Reply #11 on: November 24, 2006, 10:24:11 PM »
i think i got your point there... thanks again....
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Offline Zenn

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Re: tweeter setting
« Reply #12 on: November 25, 2006, 01:00:26 PM »
3.3 microfarad = 12045Hz (4ohm)

so if theres a 12khz highpass at your tweets, anything below 12k is being filtered out, so i guess thats why u feel something is missing.....
« Last Edit: November 28, 2006, 02:41:06 PM by Zenn »
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Offline craziechild

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Re: tweeter setting
« Reply #13 on: November 25, 2006, 06:14:29 PM »
how you all calculate the freq through the cap rating? got any formula?
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Offline wengweng

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Re: tweeter setting
« Reply #14 on: November 25, 2006, 06:19:55 PM »
I use this online calculator http://www.the12volt.com/caraudio/crosscalc.asp

BTW Zenn, the exact frequency is  12057.55 Hz  /158 kakakaka
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Offline Zenn

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Re: tweeter setting
« Reply #15 on: November 28, 2006, 02:43:18 PM »
i didnt calculate, but i have a table for the caps & corresponding frequency values, so correct or not dunno la depends on the person who published that table, hehe anyways cant hear any difference between 12045 and 12057 rite? hehe...
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Offline louis

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Re: tweeter setting
« Reply #16 on: November 29, 2006, 09:27:21 PM »
u can also find the value chart  from the 12 volt link given.http://www.the12volt.com/caraudio/cross4ohm.asp
it depend what u want to use ur capasitor as.
if u just want as an protection i think u better get cap value at much higher say 20uf. for a 2khz cut
then u may still able to use ur active cross to tune ur frequency.
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Offline craziechild

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Re: tweeter setting
« Reply #17 on: November 30, 2006, 07:24:01 AM »
thanks for the useful info there louis...
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