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Old 29th April 2003, 03:44 PM   #1
purist is offline purist  Portugal
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Join Date: Jun 2002
Location: Porto
Default Cant find capacitor values - help

Hi,

I am kind of knew building speaker xovers, so i am currently searching for the parts i need to make the Proac 2.5 clones.

In the crossover design it has a capacitor of 3.4uF and another of 7.0uF that i cant find....
Does it have to be exactly the same value, or will i just use a 3.3 instead of the 3.4 and a 6.8 for the 7.0 ?

I think not or the designer would not place those values, right?

So...what should i do ? Can i just put the 3.3uF in parallel with a 0.1uF in order to have 3.4 uF ??? Will this degrade the sound ?

Tx a lot guys...

F.T.SA
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Old 29th April 2003, 03:57 PM   #2
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Join Date: Apr 2003
Location: Kirkland, WA
Default You got it.

Yes,

You have it right. Put the 3.3 in parallel with a 0.1 to get 3.4 uF.

I'm guessing nearly every crossover ever built has some capacitors in parallel just for this reason.
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Old 29th April 2003, 06:18 PM   #3
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Join Date: Apr 2003
Location: plano, TX
I am also in the process of building a proac 2.5 clone and am using the XO published by Troels Gravesen. He has a very simple XO that uses fewer parts than the one by Al M.

Since this is my first DIY project , I wanted to keep it plain and simple. I ordered the XO and had them delivered to me assembled from madisound. The total cost was abt $120.

But if you just want to use the old version, then yes, 3.3 and .1 in parallel will give you 3.4

Cacophonix

PS: Cutting MDF to the right measurement is such a pain. I pretty much screwed up the 8x4 sheet and will be buying another sheet. This time I HAVE to follow the rule - Measure twice, cut once!
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Old 29th April 2003, 07:38 PM   #4
purist is offline purist  Portugal
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Join Date: Jun 2002
Location: Porto
Hi,

Are you taking about this xo with the notch filter ?

http://www.geocities.com/diyproac25/...acq_Troels.gif

This is what i intend to do, and it seems to me that it has a 3.4uF in the tweeter and 7.0uF in the woofer .... ???
So....what xo do YOU have ?

Cheers,

F.T.SA
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Old 29th April 2003, 07:50 PM   #5
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Join Date: Apr 2003
Location: plano, TX
I'm using the XO described in :

http://members.chello.se/jpo/2_5_clo...tch_filter.pdf

This one uses a 3.9 uF, 4.7 uF and 6.8 uF which are standard values.
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