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Ordered This From Madisound

47.197.98.131

In Reply to: RE: What Would You Do ? posted by Coner on August 21, 2017 at 00:47:04

It is the ONLY Electrolytic Cap in there, all the rest are Mylar.
This Cap is about 2.5 inches long. I could not find a physically close in size 4 mfd 100 volt Electrolytic Cap. Today's Non Polar Electrolytic Caps are physically tiny, so I ordered a Bennic Metallized Polyproplyne Cap. The circuit calls for a 10% 4 mfd 100 volt, so I ordered 5% 3.9 mfd 250 volt cap.

I wish I had a crossover schematic, so I can understand WHY all the caps are Mylar, except the one Electrolytic ?

These Cerwin Vega V 36D speakers are from the early 90's I think, so that would make them 27 years old, kind of a long time, for an Aluminum Electrolytic.

I figure the Mylar Caps, are still good.

What about the speaker diaphragms, how long do they usually last, and how do you tell when they are going bad ?

Follow Ups:

RE: Ordered This From Madisound - Coner 12:02:25 08/21/17 (1)
VERY STRANGE that the cap is that long, being electrolytic.
Even a 40uf in only 1.25" or so., Maybe a 400 uf?.

That horn won't load the driver well below 500 Hz, so you're
kind of stuck with the orig. x-over points. Minimum I'd say
around 800 Hz.
- No, The Cap said 4.0 uf at 100 volt - ka7niq 06:21:53 08/22/17 (0)
  I tried to take a picture of it, but my family room is pretty dark, and even though the cell phone camera flashed, it didn't come out very good.
  I freaked too, at the size of that cap, but remember, these bastards are 27 years old.
  
  LOL, I am really jury rigged right now, running 25 feet of 24 gage twisted alarm wire to them. Hey, it is copper at least. My 12 gage wire will be here this week.
  
  I am also just powering them with an Onkyo receiver the NR 809, because it has Audyssey and a 1/2 ass equalizer built in.
  
  However, I have a QSC PLS series amp, as well as a 60 lb Apogee Amp, that is a beast.
RE: Ordered This From Madisound - Bill Fitzmaurice 08:10:02 08/21/17 (1)
I would expect the electrolytic to be a shunt to ground on the low pass section of the midrange filter, as the higher ESR wouldn't be a problem there. But it's still odd, since 4uF mylars and polys aren't at all expensive.
- The Speakers are 27 years old - ka7niq 08:32:13 08/21/17 (0)
  I know, but whatever it is, it is getting replaced.
  I always thought that Mylar Caps can outlive people, but some say they get high ESR, after 20 + years ?

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