|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
74.233.7.23
In Reply to: RE: When to recap a speaker. posted by sanman on January 04, 2015 at 08:06:54
inside..Always put a film cap in whether it be paper or poly.You may think that old non polar cap on the midrange or tweeter sounds great and it probably does but a film cap will improve it 95% of the time in every way as long as you can fit them in.
"
Follow Ups:
films have lower ESR than 'lytics and will change the tonal balance. With my New Advents that resulted in an overly BRIGHT! sound.
I found the best compromise was replacing the 13 uF electrolytic with a 12 uF electrolytic and 1 uF film. I didn't have the patience to experiment figuring out how much additional resistance was needed to offset the ESR.
Are the new production advents are new to you? DId you let the poly or pio cap break in? They will be bright for a while but they come around and mellow out.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
First of all, they aren't "new production", just New Advents with ferrofluid cooled tweeters, metal frame woofer basket, etc. circa late 70s.
While I have experienced breakin issues with a range of components and did allow these some time, it is an uncontrivertible fact the film caps have lower ESR than the originals and effect the voicing.
Perhaps Bold Eagle might spend the time figuring out the equivalent value resistor(s) needed to balance the equation.
I think Bold Eagle posted a recommended resistor value. You could try a search.
Dave
Looks like the value is 0.5-1.0 ohms.
Ralf
Being those are ferrofluid tweeters,the only option would be a paper in oil if you wanted to try something different. I remembered after you had mentioned about the ferrofluid tweeters that I also had a situation where one of the speakers I put a poly replacement in sounded hot and bright and this was on a titanium dome tweeter…The paper in oil vitamin Q was the ticket but I had to parallel a few to get the value I needed.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
but you're missing the point. While I do understand that different kinds of capacitors vary in linearity, the issue remains that of changing the effective ESR of the crossover.
BE has determined one needs an additional 0.5-1.0 ohms to keep the overall value constant.
So Mikey, what about vintage PIO's for crossovers? I was hoping to get your input about their sound qualities? I have a ton of Sprague and other USA caps from Ramon and some Russian PIO's in larger values. I think a lot of folks could appreciate your input on speakers! Thanks in advance. Chuck
Just about every Wharfedale W series owner that used the SuperTweeter who has replaced the caps will admit if the cap is other than an oil and especially an older pcb based one, the tweeter will suck big time. These tweeters are cone style.
Don Brian Levy, J.D.
Toronto ON Canada
I haven't replaced mine but I believe you. My W90's sound fine!
Dave
For horns,there is nothing better than a good paper in oil cap because they are very linear at higher frequencies and they tend to smooth out any slight harshness.
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: