Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Crossover cap questions.
Crossover cap questions.
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd December 2009, 07:59 PM   #1
Jidis is offline Jidis  United States
diyAudio Member
 
Join Date: Jun 2007
Default Crossover cap questions.

Hi again,

I had a few more questions on caps for passive crossovers:

- Is there any major downside to running a network of parallel or series caps to get to a specific value rather than a single cap? If not, does that hold true regardless of how many you had to use (for instance, five small film caps of different values in parallel)?

- How much worse off are you for using a large value NP electrolytic to make up the bulk of the capacitance and then a small value non-electro in parallel?

- < less important question for less important crossovers > Relatively old hi-pass caps test within range on an LCR meter, and series resistance looks OK on an ESR meter. Do you assume that those caps are in good working order, and if not, under what conditions will they show their age? I've got a scope and a frequency generator and would love to actually see whatever these distortions are that I'm trying to avoid.

Much Thanks!

George
  Reply With Quote
Old 3rd December 2009, 11:12 PM   #2
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
ONE cap sounds better, always

If in need of bigger one than available, like say 150uf, the TWO filmcaps100uf+50uf is better than a single 150uf bipolar
Whether 75uf+75uf film cap is even better, I dont know, but some will claim that, other the opposite
But ONE is better, so....

But I dont say that nothing else wont work
Design is the most important of all
Then comes xover
Next is drivers
Then the built
And so forth
Xover components is pretty much last on the long list
And how you use them is even more important than the component itself

Last edited by tinitus; 3rd December 2009 at 11:18 PM.
  Reply With Quote
Old 4th December 2009, 04:04 PM   #3
Jidis is offline Jidis  United States
diyAudio Member
 
Join Date: Jun 2007
Quote:
Originally Posted by tinitus View Post
ONE cap sounds better, always
Damn. Not what I wanted to hear.

I'll have to stock up on some larger values from somewhere. I found some recommendations for Vishay (MKT maybe) and ordered a bunch of them, but there was a minimum of ten each, so I thought I would be better off going with 1 and 1.5uF, then a couple sub .5 values to fine tune. To get higher values, I'd have to order a whole batch (15 or 20 bucks worth) of something just for a couple caps and I still couldn't get the exact values in one unit. None of my target values are large. I think 5.5uF is the highest one right now.

Thanks!

George

PS- Still wondering on the second two questions if anyone knows.

<edit>- (regarding that NP electro/film combo question) If it matters much, those higher valued ones would be serving mid/low frequency duty. My tweeter stuff looks like it's all going to be <2uF.

Last edited by Jidis; 4th December 2009 at 04:14 PM. Reason: added something
  Reply With Quote
Old 4th December 2009, 06:30 PM   #4
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by Jidis View Post

then a couple sub .5 values to fine tune.

None of my target values are large.
5.5uF is the highest one right now.
Oh
with smaller values I never care too much about the exact value, but rather prefer a single cap, the closest standard value
Though one might need to determine whether going to the lower closest or higher closest value, if difference is close to the same
My, thats tricky in foreign language

Mind you, personally I have no doubt what I prefer
To me, multiple caps have more negative sideeffects than just using a standard value being slightly off value
You or others may have different experience/opinion
In time you may not think much about it either way, but will get accustomed to the sound you hear

Last edited by tinitus; 4th December 2009 at 06:34 PM.
  Reply With Quote
Old 5th December 2009, 01:27 AM   #5
pheonix358 is offline pheonix358  Australia
diyAudio Member
 
pheonix358's Avatar
 
Join Date: Jul 2008
Location: Stockport South Australia
I will have to disagree on this. Multiple small caps will decrease the impedance and inductance of the caps and this is a good thing. I have a personnal preference for only using one value when // caps. That is unless the other cap is a bypass. Using multiple caps is fine and should lead to improvements.

Terry
__________________
What we don't understand is called magic.
  Reply With Quote
Old 5th December 2009, 02:16 AM   #6
Face is offline Face  United States
diyAudio Member
 
Face's Avatar
 
Join Date: May 2007
If possible, you shouldn't parallel caps in series with your tweeter. Otherwise, don't sweat it.
__________________
"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
  Reply With Quote
Old 5th December 2009, 02:31 AM   #7
pheonix358 is offline pheonix358  Australia
diyAudio Member
 
pheonix358's Avatar
 
Join Date: Jul 2008
Location: Stockport South Australia
Quote:
Originally Posted by Face View Post
If possible, you shouldn't parallel caps in series with your tweeter. Otherwise, don't sweat it.
Why, ok it shouldn't come up very often, the values are small anyway, but why not. You decrease both inductance and resistance.
__________________
What we don't understand is called magic.
  Reply With Quote
Old 5th December 2009, 02:34 AM   #8
Face is offline Face  United States
diyAudio Member
 
Face's Avatar
 
Join Date: May 2007
In my setup, I've found that a single cap always imaged better, paralleled caps always caused some image blur. Your mileage may vary.
__________________
"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
  Reply With Quote
Old 5th December 2009, 02:37 AM   #9
pheonix358 is offline pheonix358  Australia
diyAudio Member
 
pheonix358's Avatar
 
Join Date: Jul 2008
Location: Stockport South Australia
Quote:
Originally Posted by Face View Post
In my setup, I've found that a single cap always imaged better, paralleled caps always caused some image blur. Your mileage may vary.
I agree in absolute terms if the caps are of different values, different values tend to cause smear, otherwise there may be advantages. Try both and see. It is a small point since I have seldom tried it.

Terry
__________________
What we don't understand is called magic.
  Reply With Quote
Old 5th December 2009, 02:55 AM   #10
Pit Hinder is offline Pit Hinder  Germany
diyAudio Member
 
Pit Hinder's Avatar
 
Join Date: Nov 2006
Location: Hannover, Germany
Send a message via ICQ to Pit Hinder
The main problem, single or parallel, is believing the value printed on the cap - channel differences cause the "smear".

If you are on a tight budget, ie no measuring tools and cheap caps with larger tolerances, switching in parallel is your only hope - if you are lucky, tolerances will cancel each other to some degree.
  Reply With Quote

Reply


Crossover cap questions.Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
TMWW crossover questions elshout Multi-Way 3 10th March 2008 09:51 PM
A few crossover questions Seth Smith Multi-Way 5 19th May 2004 05:18 PM
More crossover questions Saurav Multi-Way 50 25th April 2004 04:39 PM
Crossover & Box Questions octopus Multi-Way 28 20th April 2004 06:15 PM
Couple crossover questions dsanders Multi-Way 1 17th August 2001 03:39 PM


New To Site? Need Help?

All times are GMT. The time now is 10:11 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki