During another monemt of stupidity

Jhovis · 21st December 2003, 06:53 PM

I ordered 2.2uF caps instead of 2.0uF. These are Solen with a 5% tolerance (2.09-2.31) and that is out of range. This is for my MBOW1 project: http://murphyblaster.com/content.php?f=MBOW1.html
Will this be a problem? I'm going to assemble the XO anyway and if anyone thinks it is a problem, I'll order the proper 2.0 uF.

SY · 21st December 2003, 07:09 PM

If that's the cap being used in the LC series combo in the parallel woofer leg, I wouldn't worry too much. The tolerancing of the relevant driver parameters probably swamps that small error. If you want to be anal about it, you'll need to trim all the xover values for your particular drivers anyway. And if you're not anal about it, why worry, eh?

sreten · 21st December 2003, 07:14 PM

You can simply add a 200nF in parallel, and theoretically the compound capacitor will sound better.

sreten.

Jhovis · 21st December 2003, 07:24 PM

Who me...anal? Thanks, I'll just leave it alone. I've been listening to Bose 601s for the last 22-yrs. I'm sure they'll sound just fine.
jeff

SY · 21st December 2003, 07:37 PM

Quote:

Originally posted by sreten
You can simply add a 200nF in parallel, and theoretically the compound capacitor will sound better.

sreten.

Just the opposite- that takes you to 2.4uF, even farther from the target.

eStatic · 21st December 2003, 08:16 PM

You could put a 22uF in series, doh!

sreten · 21st December 2003, 08:27 PM

Quote:

Originally posted by SY

Just the opposite- that takes you to 2.4uF, even farther from the target.

Of course you are right, I mixed up the values in the post.

sreten.

Jhovis · 21st December 2003, 08:50 PM

I did the math and you are correct. However, I'm sure you're joking because it would be cheaper to just buy two more2uF caps. One 22uF would be about twice the cost of two 2uF doh indeed!

Quote:

Originally posted by eStatic
You could put a 22uF in series, doh!

kelticwizard · 21st December 2003, 09:26 PM

Just as a test, let's try the following.

If I take an 8 ohm speaker, resistive, and add a 2 uF capacitor which is 8 ohms at 10,000 Hz, how far down will my response be at 10,000 Hz?

If I take the same speaker and add a 2.2 uF capacitor at 10,000 Hz, how much farther down will my response be? Considerably less than a single dB, I am sure.

I realize that we are dealing with a more complex crossover here, but I think that might be indicative of what little difference it might make.

Jhovis · 21st December 2003, 11:45 PM

Since two of them were only $3.92, I ordered two 2uF. I'm placing another order with PE anyway. Hey sreten, I guess I am anal.
jh

21st December 2003, 06:53 PM	#1
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	During another monemt of stupidity I ordered 2.2uF caps instead of 2.0uF. These are Solen with a 5% tolerance (2.09-2.31) and that is out of range. This is for my MBOW1 project: http://murphyblaster.com/content.php?f=MBOW1.html Will this be a problem? I'm going to assemble the XO anyway and if anyone thinks it is a problem, I'll order the proper 2.0 uF. __________________ jeff

21st December 2003, 07:09 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	If that's the cap being used in the LC series combo in the parallel woofer leg, I wouldn't worry too much. The tolerancing of the relevant driver parameters probably swamps that small error. If you want to be anal about it, you'll need to trim all the xover values for your particular drivers anyway. And if you're not anal about it, why worry, eh? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

21st December 2003, 07:24 PM	#4
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Who me...anal? Thanks, I'll just leave it alone. I've been listening to Bose 601s for the last 22-yrs. I'm sure they'll sound just fine. jeff __________________ jeff

21st December 2003, 08:16 PM	#6
eStatic diyAudio Member Join Date: Dec 2003 Location: blue ridge mountains	You could put a 22uF in series, doh! __________________ This space for rent.

21st December 2003, 09:26 PM	#9
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	Just as a test, let's try the following. If I take an 8 ohm speaker, resistive, and add a 2 uF capacitor which is 8 ohms at 10,000 Hz, how far down will my response be at 10,000 Hz? If I take the same speaker and add a 2.2 uF capacitor at 10,000 Hz, how much farther down will my response be? Considerably less than a single dB, I am sure. I realize that we are dealing with a more complex crossover here, but I think that might be indicative of what little difference it might make. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous


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21st December 2003, 07:14 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	You can simply add a 200nF in parallel, and theoretically the compound capacitor will sound better. sreten.

21st December 2003, 11:45 PM	#10
Jhovis diyAudio Member Join Date: Sep 2002 Location: Atlanta	Since two of them were only $3.92, I ordered two 2uF. I'm placing another order with PE anyway. Hey sreten, I guess I am anal. jh __________________ jeff

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