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Old 08-28-2011, 01:41 AM
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Default Passive crossover question

I just bought a set of xst2 supertweeters and I am planning on putting a cap between each xst2 and mid.


Should I choose the capacitance based on the crossover frequency and the impedence of just the tweeter or the impedance of the mid and tweeter together?


I was looking at these caps

Dayton Loudspeaker Metallized Caps at Parts Express

and doing a little googling about passive crossovers

Designing Passive Crossovers


I'm looking to get a 12db/octave slope at 4000hz
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Old 08-28-2011, 01:43 AM
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just the impedance of the tweeter. {the tweeter is all that is controlled by the capacitor}
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Old 08-28-2011, 01:45 AM
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Originally Posted by iamsonic View Post
just the impedance of the tweeter. {the tweeter is all that is controlled by the capacitor}

Ok thanks man. I was hoping I was just overthinking it.
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Old 08-28-2011, 01:48 AM
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Sonic beat me too it. +1 if you are making your own crossovers. I will never go back to buying some!
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Old 08-28-2011, 01:50 AM
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Sonic beat me too it. +1 if you are making your own crossovers. I will never go back to buying some!

Yeah I think it's about time for me to venture into the realm of making my own crossovers .


Btw what kind of slope will one of the caps from the link I posted produce?
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Old 08-28-2011, 02:04 AM
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A capacitor in series with the speaker makes a 6db per octave attenuation below the frequency.
1 octave = doubling or halving of a frequency
300hz is one octave above 150hz... 80hz is one octave below 160hz.

6db = 1st order = one crossover component
[highpass = capacitor in series]
[lowpass = coil in series]

12db = 2nd order = two crossover components
[2nd order highpass = capacitor in series & coil in parallel]
[2nd order lowpass = coil in series & capacitor in parallel]
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Old 08-28-2011, 02:29 AM
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Crossovers are very tough to actually design....If you havent studdied them well.

Okay, first:

The crossover point depends on the filter ORDER/type and along with that of the OTHER drivers.

Say you go with a ODD order butterworth filter for your tweeter's highpass, then you also go with the SAME for the midrange. For them to blend proper(flat) You must allow the F3 point of each driver to be the same because they will sum UP 3db at that point. If you choose an even order then they have to cross eachother at F6(6db down).

What's more is that even the acoustical phase of each blended driver will change the crossover! What i mean is the placement and angle of each component will change the crossover.

Also if you use inductors they will carry resistance...Maybe not a whole lot but be carefull. If it is significant then you will change the ts paramaters of the driver like the Qes which is something that is much more sensitive for high frequency speakers.

Its seems easy and you may want to try but you should study design first.

Last edited by Novicaine; 08-28-2011 at 02:38 AM.
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Old 08-28-2011, 02:42 AM
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Good info man.
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