I've just finished reading an old HiFi world where Noel Keywood added a small value resistor for the HF unit of a Martin Logan electrostatic / hybrid speaker.
He then discovered the 20khz response was down 10db 😕
However.. on another well known technical hi-fi forum, it has been suggested / recommended that to drop the HF level by 1db, you need only insert 0.5R
I'm racking my brains... but I see that the only major effect of adding R in series with the HF circuit is to reduce all of it's output - i.e. adding a shelf in the response
Have I got this right ? If not, why not ?
Thanks
He then discovered the 20khz response was down 10db 😕
However.. on another well known technical hi-fi forum, it has been suggested / recommended that to drop the HF level by 1db, you need only insert 0.5R
I'm racking my brains... but I see that the only major effect of adding R in series with the HF circuit is to reduce all of it's output - i.e. adding a shelf in the response
Have I got this right ? If not, why not ?
Thanks
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No, you don't have it right, sorry. 🙁
You are trying to apply what is done to a conventional speaker, to a very unconventional one.
Electrostatic speakers are basically capacitive, so a series resistor attenuates *much* more at higher frequencies than at lower ones.
From the Quad ESL literature:
You are trying to apply what is done to a conventional speaker, to a very unconventional one.
Electrostatic speakers are basically capacitive, so a series resistor attenuates *much* more at higher frequencies than at lower ones.
From the Quad ESL literature:
Which, by the way, is to be expected from two metallized sheets separated by a dielectric.
I should have mentioned... The speakers in question where the 0,5r is being added, are not electrostatics but moving coil designs.
I have probably mixed the 2 issues up. 1) I didn't realise that the characteristics of electrostatics were wildly different to normal designs... Thks for the clarification and 2) wanted to check the theoretical effect of adding 0.5 to a normal HF section
I have probably mixed the 2 issues up. 1) I didn't realise that the characteristics of electrostatics were wildly different to normal designs... Thks for the clarification and 2) wanted to check the theoretical effect of adding 0.5 to a normal HF section
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Yes, I already knew that ... but your doubt was about the
and that's what I answered.
EDIT: just read your addendum.
Fine, in that case don't worry, if you work with conventional, moving coil speakers, you'll get the shelf you want.
Good luck 🙂
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