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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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Old 6th October 2016, 11:03 PM   #11
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by billshurv View Post
Which is almost proof as to why EE's are often
the worst people to design active crossovers!
Hi,

Very true, when EE's get it very wrong, but
who do you need to tell how to do it right ?

rgds, sreten.
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Old 16th October 2017, 05:21 PM   #12
guidobullo is offline guidobullo  Italy
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Quote:
Originally Posted by AndrewT View Post
I can't read that Italian article, but I think it is describing a subtractive filter arrangement.
I suggest you look at the simpler lowpass and high pass filters.
ESP has a couple of articles and a calculator for the LR filters.
Linkwitz Riley as described in the Linkwitz site is more comprehensive.
Sreten is correct that it's the total filter of electrical plus acoustic that needs to be your target. But Struth's very much simpler LR4 suggestion to get you started works quite well in some circumstances.

Use a good driver that performs well in it's passband and filter out the signals that make it misbehave and you will find that the steeper LR4 allows a good sound from good drivers very simply.
It's worth trying as a start. You may be happy with what you get.
ho seguito i consigli grazie dei suggerimenti.
ciao guido
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Old 16th October 2017, 06:45 PM   #13
Mooly is offline Mooly  United Kingdom
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English only please Guido. diyAudio Rules

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I followed the tips thanks for the suggestions.
Hello Guido
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Old 16th October 2017, 07:27 PM   #14
Cal Weldon is offline Cal Weldon  Canada
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Funny translator. Ciao is both hi and bye, just like aloha and numerous others I'm sure.
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Old 16th October 2017, 07:51 PM   #15
THD+N is offline THD+N  United States
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Guido,
If you want to design active filters easily, with minimal math or understanding of their realization, I suggest Don Lancaster's Active Filter cookbook. It is great for any level of understanding.
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Old 17th October 2017, 11:51 PM   #16
tom2016 is offline tom2016
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Quote:
Originally Posted by billshurv View Post
Which is almost proof as to why EE's are often the worst people to design active crossovers!
EEs are probably the best people to do the math though. Explaining things, maybe not so much. As an EE myself I'm one of those with impeccable communication skills, a rarity.
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Old 18th October 2017, 12:35 AM   #17
Nelson Pass is offline Nelson Pass  United States
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The key problem is that the standard sorts of filters are not tolerant of the
amplitude and phase errors of the loudspeaker drivers, and the summed results
for any driver whose bandwidth doesn't exceed the filter by a couple of octaves
are not usually good.

Siegfried Linkwitz dealt with it by equalizing and phase-shifting the driver as
part of getting a good response, although that is more complicated and tedious.

A simpler approach is to individually adjust the number and frequency of
the poles of the filter until you get a decent sum, something that you don't
find in fixed-formula filter sets. It still can be time consuming, but at least
it doesn't require additional circuitry.
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Old 18th October 2017, 08:10 PM   #18
jmbee is offline jmbee  France
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Quote:
Originally Posted by guidobullo View Post
aggiungo il file
That's funny.
It is not a "cross-over attivo a fase lineare", all Elektor rédactions made this
naive mistake, in France also, it's a
Subtractive Implementation of Linkwitz-Riley Crossover Design :
AES E-Library >> A Subtractive Implementation of Linkwitz-Riley Crossover Design

an other way to get a standard LR4
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Old 29th April 2018, 01:29 AM   #19
guidobullo is offline guidobullo  Italy
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[QUOTE=consort_ee_um;4847249]More explanation here:
3-Way Active Crossover with Linearity Phase eng[
dale + wima good,good,good,good,good,good,good
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Old 29th April 2018, 09:34 AM   #20
jmbee is offline jmbee  France
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[QUOTE=guidobullo;5418414]
Quote:
Originally Posted by consort_ee_um View Post
More explanation here:
3-Way Active Crossover with Linearity Phase eng[
dale + wima good,good,good,good,good,good,good
Explanations fancy.
Once again, this is not a linear phase crossover, just a LR4, spice it, you wil see.
Linear phase subtractive xo needs a time delay path, hard to get acourate
with analog circuitery, see Douglas Self / the design of active crossovers /
Ch 10.8 : delay lines for subtractive crossovers. The Design of Active Crossovers by Douglas Self

Last edited by jmbee; 29th April 2018 at 09:39 AM.
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