Alright - Who can fire up a list of parts for RSII xover?
- Thread starter MaxSeven
- Start date
Two equal caps in series halve the effective capacitance. So you'd need two 320µf polarized caps in series to simulate a 160µf non-polar cap.
Series formula is 1/C = 1/C1 + 1/C2 + 1/C3 .....and on and on. With just two caps, you can use product over sum: C = (C1 x C2) / (C1 + C2). If the two caps are equal in value, just slash the cap value in half for your answer.
Series formula is 1/C = 1/C1 + 1/C2 + 1/C3 .....and on and on. With just two caps, you can use product over sum: C = (C1 x C2) / (C1 + C2). If the two caps are equal in value, just slash the cap value in half for your answer.
MaxSeven
Word Skeptic
Hey did you guys check this site? They seem to have a very large selection of electronic components. But, are they good for audio?
http://www.tedss.com/item.asp?id=2020005347
http://www.tedss.com/item.asp?id=2020005347
Hmm, can't remember but I think I used a polar 1 in my old Infinity's. Everything was MKP except that one 150uF. Can be that it was polar but don't remember...
My commen sense tells me that you have to use NP because a speaker works on AC and a cap can't handle AC (it explodes). Maybe it has something to do with that?
My commen sense tells me that you have to use NP because a speaker works on AC and a cap can't handle AC (it explodes). Maybe it has something to do with that?
Here is a link that describes aluminum electrolytic capacitors in terms of their operating principles, fabrication, reliability, and cautions:
http://www.elna-america.com/tech_al_principles.php
(this is a commercial site, I have no affiliation, etc....)
http://www.elna-america.com/tech_al_principles.php
(this is a commercial site, I have no affiliation, etc....)
240sx4u
Lunatic Member
Well, I am back on board with the recap project. I was going to let it slide and ignore the problem but my mids dropped out again on one speaker. I have a problem with one of the large can caps. I find it hard to believe the others are in better shape..
If I find a solution I will be sure to post.
Evan
If I find a solution I will be sure to post.
Evan
dnewma04
The Healer
I'll have a site with links to PE part numbers that will allow you to recap in dayton poly pro caps for the mids/highs and and NPE caps for a majority of the capacitance on the woofer section with a decent percentage of the total accounted for with signfiicantly higher quality poly pro caps.
If there is interest, I can create something similar with all NPE for those on a tight budget or all polypro caps for someone with a bit too much money in their pockets.
If there is interest, I can create something similar with all NPE for those on a tight budget or all polypro caps for someone with a bit too much money in their pockets.
dnewma04
The Healer
FWIW, those small NPE's would be lucky to be able to carry a fraction of the current of the original large can capacitors. That may or may not be important here, but should be considered. I'd be more inclined to use a pair of 3300µf large-can caps back-to-back.
dnewma04
The Healer
I have never seen the stock crossovers, I was just going with the specs shown in the schematic. I have no reason to doubt that a pair of large can caps might be more appropriate, but I would still like the influence of a higher quality cap than an electrolytic in that position. Perhaps a slightly smaller pair of large can caps in series bypassed by a polypro cap?
I know that woofers aren't nearly as important with respect to the use of electrolytics but I guess I might be a little extra anal if investing the kind of money necessary to recap these speakers.
BTW, any worries about ESR with the larger can caps in this case? (it's another reason I would prefer to throw a polypro into the mix and one of the reasons I suggested the batch of paralleled caps.
Thanks for your thoughts.
I know that woofers aren't nearly as important with respect to the use of electrolytics but I guess I might be a little extra anal if investing the kind of money necessary to recap these speakers.
BTW, any worries about ESR with the larger can caps in this case? (it's another reason I would prefer to throw a polypro into the mix and one of the reasons I suggested the batch of paralleled caps.
Thanks for your thoughts.
Most large-can caps are large for a variety of reasons, one being to effect very low ESR, which is directly related to ripple current rating. Big caps have a lot of surface area, and subsequently very low ESR and very high ripple current ratings.
Like I said, if I was going to rebuild the crossover on my RS 2.5's, I'd go the 'back-to-back' route with a pair of large-can electrolytics, and maybe bypass with a small film cap (but for the woofer, the small film cap is likely to have 'little-to-no' real effect on the circuit).
Like I said, if I was going to rebuild the crossover on my RS 2.5's, I'd go the 'back-to-back' route with a pair of large-can electrolytics, and maybe bypass with a small film cap (but for the woofer, the small film cap is likely to have 'little-to-no' real effect on the circuit).
dnewma04
The Healer
My primary concern would have been ESR, and if it's low in large can caps, then I would have no problem with their use. 
When I have used electrolytics in speakers, I've used them only on woofer sections and generally have bypassed, but if there were an area that would be less critical about needing a bypass cap, it would be in this application.
Thanks again for your comments.
When I have used electrolytics in speakers, I've used them only on woofer sections and generally have bypassed, but if there were an area that would be less critical about needing a bypass cap, it would be in this application.
Thanks again for your comments.
MaxSeven
Word Skeptic
Yes, I replaced the mid pots long ago, but I haven't changed anything else as of yet.
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