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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: That's not my experience at all! posted by E-Stat on September 21, 2024 at 08:45:28:
You said Modern film caps (with improved linearity) have lower ESR than electrolytics and can most certainly change response if just dropped in as replacements. I first experienced this years ago upgrading the caps in New Advents with films.
True and not true. If a conductor is more linear it just means that conductor has less resistance/ESR electrical series resistance or just resistance. ESR is a way to measure how conductive a capacitor is the lower resistance/ESR the more conductive/linear it is.
being more linear/having lower ESR will not affect the frequency response. A 2 UF capacitor is 2 UF does not matter if it's electrolytic or film the only way a capacitor can change a crossovers response is if the value of that capacitor changes. So, if a 2 UF electrolytic capacitor on a given tweeter starts cutting frequency from 7000 KHZ down at 6 DB per octave that frequency response will not change if you switch between electrolytic, metalized film, or metal film as long as the value of 2 UF is unchanged the frequency response will stay exactly the same.
However, the capacitor with the least amount of resistance/ESR will be more linear/pass more currant and therefore it will be louder. So, if you changed the caps on old Advent's and you used the same value the frequency response will be exactly the same. So, I will assume they were 2 ways, and you changed the series caps on the tweeter the woofer would not have series caps. And if the stock caps were electrolytic and you changed to metal film with a very low ESR/resistance then your tweeter would be notably louder. 2 to 3 decibels louder or more.
People do this all the time they think they are going to improve the sound of well-designed speakers with expensive metal film capacitors then they complain the capacitors suck because they made their tweeter to bright when in fact, they did not they just made it louder. So now you have to go and increase the value of the resistors in the L-pad to pull the volume of the tweeter down to match the woofer again. So, they think less resistance in the capacitor will improve the sound, but they have to increase the resistance in the L-pad to attenuate the tweeters volume to match the woofer again.
Audiophile speaker manufactures are not using aluminum film, copper film or silver film capacitors for a reason the law of diminishing return. These capacitors are usually bought by DIY builders that have not learned about the law of diminishing return yet.
Honestly it makes no sense to use millionaire capacitors like copper and silver film you will spend more on capacitors than on tweeters. When you see copper & silver film capacitors selling for more than beryllium diaphragm tweeters you have to laugh.
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Follow Ups
- RE: That's not my experience at all! - seancuster71@gmail.com 20:23:47 09/21/24 (3)
- ESR & capacitance linearity - 13th Duke of Wymbourne 15:22:52 09/22/24 (1)
- RE: ESR & capacitance linearity - seancuster71@gmail.com 19:37:59 09/22/24 (0)
- Believe whatever you please -nt - E-Stat 06:08:18 09/22/24 (0)
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