Which is the best combo to get 185µF for SRS-2 cap upgrade

mmadden28

As the subject line says, what is the best combination of film cap values to get to the high value required in the SDS SRS-2?
I'm limiting my query to Dayton DMPC 5% caps from PE and the values they offer. Feel free to make another brand suggestion if the quality and cost are comparable.

The SDA SRS-2 schematic shows a 55µF and a 130µF cap in parallel for a total capacitance value of 185µF.
I'm not sure what the spec tolerance is but I'm assuming at least +/-5% so the acceptable range is between 176µF and 194µF (right?)

Using the values available at PartsExpress I came up with the following combos:
Tot. µF - µF values - Cost (2 speakers)
190µF == 100µF + 90µF = $87.44
185µF == 75µF + 60µF + 50µF = $87.28
183µF == 68µF + 68µF + 47µF = $57.94
186µF == 68µF + 68µF + 50µF = $57.36

Here are my questions/concerns:
Is it better to go with 2 caps vs. 3? (190 vs. the rest)
YES - NO - No Difference

Is it better to go over or under when coming close to specd' value (183 vs. 186)
YES - NO - No Difference


If you notice the 190 and 'on spec' 185 cost out to ~$87 while the 183 and 186 come out $30 less at ~$58.

If I go with my gut-I'd save the money and go with the 183 or 186 combo and probably the 186 as its closer.

What does everybody think?

ShinAce

Without real world measurements, I'd go lower if I had to. New caps are usually right on par, or slightly above spec.

I say 68-68-47
or
68-68-50

The choice boils down to the 47 versus the 50.

47 is a very standard value.

50 is not. So I'd wonder what's different about the 50. Is it more precise? A different line of cap? Or just a 47 marketed as a 50!

w_coyote

I went with the clarity caps px series for my 1B's, 3-47uf and 2-22uf. These are some big caps and I had to mount them on a seperate board. There was also 2-34uf on the same board,2-22uf and 2-12uf also big caps and could not fit everything on the same board.

Face

Split it in half, 90 and 90.

george daniel

^^^^^^^^^^what he said^^^^^^^^^^^^^^^^^

mmadden28

ShinAce wrote: »

Without real world measurements, I'd go lower if I had to. New caps are usually right on par, or slightly above spec.

I say 68-68-47
or
68-68-50

The choice boils down to the 47 versus the 50.

47 is a very standard value.

50 is not. So I'd wonder what's different about the 50. Is it more precise? A different line of cap? Or just a 47 marketed as a 50!

All the values I chose are from the Dayton DMPC 5% line and all avail at Parts Express--As far as I know its just a diff value so either are an option.

mmadden28

Face wrote: »

Split it in half, 90 and 90.

george daniel wrote: »

^^^^^^^^^^what he said^^^^^^^^^^^^^^^^^

Duh--I didn't even think about adding the 90µF(x2) to the mix--I guess I was concentrating on what others used (the 190) vs as close to spec as I could get-That would be about $81 per speaker pair.

So even in the LF circuit you guys think an even split is better than closer to spec?

For this application which is more important?
Even split?
Less qty caps?
Closer to spec
All of the above?

I guess I could also throw the Erse 91µF(x2) into the mix--that would be:
182µF == 91µF + 91µF = $72.60 (Erse PulseX)
180µF == 90µF + 90µF = $81.16
190µF == 100µF + 90µF = $87.44
185µF == 75µF + 60µF + 50µF = $87.28
183µF == 68µF + 68µF + 47µF = $57.94
186µF == 68µF + 68µF + 50µF = $57.36


Sorry for all the questions-I'm trying to learn a bit about 'why' along the way here as well.

If it matters great--but if it doesn't, no sense in throwing $30 away. How are all these different values going to affect the end result anyway?

mmadden28

w_coyote wrote: »

I went with the clarity caps px series for my 1B's, 3-47uf and 2-22uf. These are some big caps and I had to mount them on a seperate board. There was also 2-34uf on the same board,2-22uf and 2-12uf also big caps and could not fit everything on the same board.

Wow so you used 5 caps for the 185? That's $208 per speaker pair!

Yeah I'm not so much concerned about mounting/space--really just about the best end result while keeping cost into consideration.

FTGV

It looks like that pair of paralleled caps are filtering the low bass out of the dimensional L-R signal.IMO a decent (read non exotic)polypropylene will suffice.As for tolerances I suspect the stock lytics were no better than 10% or so.

mmadden28

Bump

FTGV

IMO these would be perfectly fine for the application. http://www.solen.ca/pub/cms_nf_catalogue_fiche.php?id=1410&recherche=&numRows=&manufacturiers=&niveau1=1&niveau2=3&niveau3=26

HB27

http://www.parts-express.com/pe/pshowdetl.cfm?Partnumber=027-352
Inexpensive non polarized on the LF will be more than adequate. Use 4 to make the value of the filter. Within tolerance
Give them a shot. You can always replace IF desired. I've used a couple of dozen of these on my Polks, Klipsch, Altecs, AR9LSI, etc with GREAT results. No complaints at all on the lower side.
Cost is about $1.25 each

Face

FTGV wrote: »

IMO these would be perfectly fine for the application. http://www.solen.ca/pub/cms_nf_catalogue_fiche.php?id=1410&recherche=&numRows=&manufacturiers=&niveau1=1&niveau2=3&niveau3=26

Another good suggestion.

Joe08867

I would either split the difference or use the Solen's 180 from above. Seeing the tolerance on the solen or Dayton is at least 5% it would be just about the same as the original 185 from Polk.

Figuring the Polk probably had a tolerance of 10% that would make it 166.5 - 203.5

The Dayton(2x90) or Solen (180) with a 5% tolerance would be 171 - 198. Actually a tighter tolerance overall. And probably closer to what the original engineer wanted in the first place.

mmadden28

OK so I think I'm going to stick with a 2 cap equal split solution and may get the Axon 91µF True Caps ($60 for 2 speakers).

While I'm placing that order I could order some of the other low pass caps that I need for the SRS2 and 2B upgrades as well save as few bucks (or might be wash after shipping).

So what's the better choice of the two brands?
Dayton DMPC 5% or AXON True Caps 5%


And if Axon--I need a 40µF for the 2B XO, Axon only has 39µ and 41µ. Which one is the better choice?

F1nut

I need a 40µF for the 2B XO

Two 20uF Sonicaps. They are excellent shunt caps and yes, it makes a difference.

mmadden28

Now I thought the low pass caps were not as important and to concentrate the money spent on the high pass caps. So you think they do?

4x20µF Sonicaps would be $114 vs. 2x40µ Daytons at $20.48

mmadden28

mmadden28 wrote: »

OK so I think I'm going to stick with a 2 cap equal split solution and may get the Axon 91µF True Caps ($60 for 2 speakers).

While I'm placing that order I could order some of the other low pass caps that I need for the SRS2 and 2B upgrades as well save as few bucks (or might be wash after shipping).

So what's the better choice of the two brands?
Dayton DMPC 5% or AXON True Caps 5%


And if Axon--I need a 40µF for the 2B XO, Axon only has 39µ and 41µ. Which one is the better choice?

Anybody here have an opinion on Axon vs. Dayton?

FTGV

mmadden28 wrote: »

Anybody here have an opinion on Axon vs. Dayton?

IMO Since it looks like it's for the shunt position in the dimensional drivers low pass section the differences should be negligable.As for 39UF vs 41 uf either will work fine.

Face

mmadden28 wrote: »

Anybody here have an opinion on Axon vs. Dayton?

Either would get the job done. On a few projects where money was a concern, if I was ordering other parts from Sonic Craft, I'd pick up Axon caps for shunts. If I was ordering from PE, I'd pick up Dayton caps. If I was ordering from Madisound, I'd pick up the cheapest Claritycap. It's not until you spend a little more that it'll really matter, but any of those I just mentioned would be an improvement over an electrolytic. Get off the fence already.

Hopefully this doesn't incite a riot, but I'd take Solen over the three I just mentioned, but only for a shunt. The next step up from there would be a Claritycap ESA.

avguytx

I used all Solen caps on my SRS 2 crossovers....there's a 130uf and 58uf tied in together. Can't remember what I spend on them...it's ben 3 years now.

And yes....they are also zip tied together when mounted in the cabinet. Those 130uf caps approach the size of a coke can almost!

tonyr1

avguytx wrote: »

I used all Solen caps on my SRS 2 crossovers....there's a 130uf and 58uf tied in together. Can't remember what I spend on them...it's ben 3 years now.

And yes....they are also zip tied together when mounted in the cabinet. Those 130uf caps approach the size of a coke can almost!

P.S. DO NOT put these in your carry-on bag:eek:

Joe08867

I used Daytons and they sound very good. Solens is better to my ears but Daytons work very well for the price.